METHOD FOR LOCATING A SUBMARINE CABLE FAULT, REPEATER AND COMMUNICATION SYSTEM

专利摘要:
method for locating a faulted submarine cable, repeater and communication system a method for locating a fault in a submarine cable, a device and a communication system are provided. a pulse of light extracted by a repeater, rpt, is incident to a fault location like a probe light pulse. rpt obtains a time difference between the probe light pulse and the reflected probe light pulse, and sends the time difference to an underwater line terminal equipment, sl / te. so that the sl / te can easily locate the fault according to the principles of an optical time-domain reflector, otdr. if compared with the prior art, the method can locate the submarine cable failure more quickly and sweetly, so that maintenance personnel can maintain the submarine cable in time.
公开号:BR112012006471B1
申请号:R112012006471-1
申请日:2010-09-08
公开日:2021-03-23
发明作者:Sen Zhang；Zhiyong Feng
申请人:Huawei Technologies Co., Ltd.；
IPC主号:

专利说明:

[0001] The present invention relates to the field of communication technologies and, in particular, to a method for locating a fault in an underwater cable, a repeater (RPT) and a communication system. BACKGROUND OF THE INVENTION
[0002] In recent years, a dense wavelength division multiplexing (DWDM) and an erbium-doped fiber optic amplifier (EDFA) have become mature technologies, large capacity long distance communications including fibers and EDFAs are growing, and systems international submarine communications networks are growing. Therefore, subsea line faults must be located quickly and accurately, so that maintenance personnel can remove faults quickly, which can reduce the cost of operating the subsea communication system.
[0003] Generally, an undersea system includes two subsea line terminal equipment (SLTEs) and multiple RPTs. Each RPT is configured to amplify an optical signal which is previously attenuated on a link. In RPT, the EDFAs of each fiber pair share a pump laser, as shown in Figure 1. In the prior art, a coherent optical time domain reflector (COTDR) technology is most widely used for link fault location submarines. Similar to the principles of an existing optical time domain reflector (OTDR), COTDR uses Rayleigh dispersion and Fresnel reflection to represent fiber characteristics, but COTDR differs from OTDR principles in that COTDR use coherent detection at a receiver to improve the signal-to-noise ratio of a received signal.
[0004] Figure 2 is a brief schematic diagram of a hardware which uses COTDR technology to locate undersea cable faults. A controller in a terrestrial detection device controls a sonar light source for the extraction of probe light. The probe light is divided by a 3 dB coupler into two parts. One part is a local oscillating light for coherent detection, and the other part is displaced and modulated by an acoustic-optical modulator in a pulse light. The pulse light and a service signal (specifically, a main signal in figure 2) are coupled together by a multiplexer with wavelength division in the figure as the probe light. The probe light is reflected back to an input side, as the probe light pulse runs through the fiber joints, break points, break planes, end points or other defective points of the fiber, and the reflected light is captured by a probe on the input side. In addition, non-uniform particles smaller than the wavelength in the fiber material lead to Rayleigh dispersion. A smaller portion of the scattered light is transmitted inversely to the input side along the fiber, but the light cannot be reflected or scattered back to the original route. Therefore, a 10 dB beam splitter is added after every EDFA in the RPT (the RPT is the same as the RPT in figure 1), so that the light can be reflected and scattered backwards along a reverse path of the fiber . A multiplexer with wavelength division in the terrestrial detection device separates the reflected light and the scattered light from the main signal. The reflected light and the scattered light are filtered by an optical filter, and are incident together with the local oscillating light on the surface of the probe by a coupler. On the surface of the probe, light is received consistently. The probe converts the optical signal into an electrical signal. The controller processes the electrical signal to obtain a characteristic fiber loss curve. The fiber loss characteristic curve is displayed on a monitor.
[0005] When both the transmission line and the EDFA are normal, because the scattered light behind the probe light is amplified by the EDFA persistently, the scattered back light received by the COTDR is a series of sawtooth waves. As shown in figure 3, the peak value of each sawtooth represents a signal strength extracted through each EDFA after the back scattered light passes through the EDFA, and the sawtooth hypotenuse means that the scattered optical power backwards attenuates with increasing transmission distance. If the link is cut, because Fresnel's reflected light is much stronger than Rayleigh's scattered light, the intensity of the optical signals which are on the curve and are detected by COTDR is attenuated quickly. For example, location a in the figure is a fiber cut.
[0006] The light scattered backwards makes a spontaneous amplifier emission (ASE) whenever it passes through an EDFA, and can pass through multiple EDFAs, when it reaches the probe. Therefore, a lot of ASE noise is accumulated over the link. To obtain the accurate location of the fiber cut detected through the curve in figure 3, the light probe needs to emit many pulses of light, and many media calculation operations need to be performed on the receiver to improve the signal-to-noise ratio of the signals. For example, if a single 12,000 km stretch of submarine link is 100 km, the link will require 120 EDFAs, and the number of amplifiers and the accumulated ASE noise spectrum density will be calculated using the following formula (1): DASE = N · [2 · nsp · (G -1) · h .v] (1)
[0007] In the preceding formula, DASE is the accumulated ASE noise spectrum density, N is the number of EDFAs, nsp is the spontaneous emission factor of EDFA, G is the EDFA gain, h is a Plank constant, and n is a optical center frequency. According to the general EDFA parameters, the accumulated noise of the 12000 km link can be calculated. In order to detect the 12000 km link using COTDR, at least 216 averaging operations need to be performed. An averaging operation requires the pulse to complete a complete round trip of 12000 km. According to the speed of light propagation in the fiber, the time consumed by the 216 averaging operations can be calculated, which is not less than 2 hours.
[0008] In the process of developing and practicing the prior art, the inventor of the present invention finds that, in the method for locating a fault in a submarine cable system in the prior art, the probe light must pass through multiple EDFAs when traveling back to the COTDR, and an ASE noise is accumulated; consequently, multiple averaging operations need to be performed; in each averaging operation, the probe light pulse travels from the point of emission of the probe pulse to the point of the fiber cut and then travels back from the point of the fiber cut to the point probe pulse emission. Therefore, it takes too long to locate the underwater line fault in the prior art, and the fault cannot be located in time. SUMMARY OF THE INVENTION
[0009] The modalities of the present invention provide a method for locating a fault in an underwater cable, a device and a communication system, which can locate the fault in the underwater cable quickly, so that maintenance personnel can maintain the cable. submarine in time.
[0010] One embodiment of the present invention provides a method for locating an underwater cable failure, comprising: the receipt, by a repeater, RPT, in a section to which a fault location belongs, of a location detection execution command sent by an underwater line terminal equipment, SLTE; on what: triggering the generation of a probe light pulse according to the location detection execution command received; transmitting the probe light pulse to the fault location along an SLTE sending direction; recording a start time T1 and an end time T2 for extracting the probe light pulse; detecting the reflected probe light pulse from the fault location, and obtaining a T3 probe light pulse detection time; and sending time T1 and time T3 to SLTE, or sending a time difference between time T3 and time T1 to SLTE, where SLTE obtains the fault location according to a formula d = (c * t) / (2IOR), where d represents a distance between a generation location of the probe light pulse and the fault location, c represents a speed of light propagation in vacuum, t = T3 - T1, and index of refraction (IOR) refers to an index of refraction of means of transmission.
[0011] One embodiment of the present invention also provides a repeater, RPT, comprising a detection unit and a sending unit; on what: the detection unit is configured to receive a location detection execution command sent by an underwater line terminal equipment, SLTE; triggering the generation of a probe light pulse according to the location detection execution command received; transmitting the probe light pulse to locate a fault along an SLTE sending direction; recording a start time T1 and an end time T2 for extracting the probe light pulse; detecting the reflected probe light pulse from the fault location, and obtaining a T3 probe light pulse detection time; and the sending unit is configured to send time T1 and time T3 to SLTE, or to send a time difference between time T3 and time T1 to SLTE, where SLTE obtains the fault location accordingly with a formula d = (c * t) / (2IOR), where d represents a distance between a generation location of the probe light pulse and the fault location, c represents a speed of light propagation in a vacuum, t = T3 - T1, and refractive index, IOR, refers to a refractive index of transmission media.
[0012] One embodiment of the present invention also provides a communication system, which includes underwater line terminal equipment, SLTE and a Repeater, RPT; on what: the SLTE is configured to obtain a section to which a fault location belongs, and to send a location detection execution command to the RPT on the section; the receipt of time T1 and time T3 which are sent by RPT, or the receipt of a time difference which is between time T3 and time T1 and is sent by RPT; obtaining the fault location according to a formula d = (c * t) / (2IOR) and time T1 and time T3 or the time difference between time T3 and time T1, where d represents a distance between a probe light pulse generation location and the fault location, c represents a speed of light propagation in a vacuum, t = T3 - T1, and Refractive Index, IOR, refers to a refractive index of media streaming; and the RPT is configured to receive a location detection execution command sent by SLTE; triggering the generation of a probe light pulse according to the location detection execution command received; transmitting the probe light pulse to the fault location along an SLTE sending direction; recording a T1 start time for extraction of the probe light pulse; detecting the reflected probe light pulse from the fault location, and obtaining a T3 probe light pulse detection time; and sending time T1 and time T3 to SLTE or sending the time difference between time T3 and time T1 to SLTE.
[0013] In the embodiments of the present invention, the RPT controls the internal EDFA, so that the EDFA extracts a light pulse as a probe light pulse which is incident to the fault location; therefore, the RPT obtains the time difference between the probe light pulse and the reflected probe light pulse, and sends the time difference to the terrestrial SLTE; and SLTE can find the fault location according to OTDR principles. If compared to the prior art, the method can locate the undersea cable failure more quickly and more accurately, so that maintenance personnel can maintain the subsea cable in time. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to make technical solutions in the modalities of the present invention or in the prior art clearer, the following sketches of the associated drawings involved in the description of the modalities or the prior art. Of course, the associated drawings outlined below are merely a part of the embodiment of the present invention. People skilled in the art can also derive other designs from the associated designs without creative efforts. Figure 1 is a structural diagram of a submarine cable system in the prior art; figure 2 is a schematic diagram of a system for locating an underwater cable fault using the principles of a COTDR in the prior art; figure 3 is a schematic diagram of a probe result curve using the principles of a COTDR in the prior art; figure 4 is a schematic diagram of a communication system according to Mode 1 of the present invention; figure 5 is a schematic diagram of local units of a TOR according to Mode 2 of the present invention; Figure 6 is a brief schematic diagram of an RPT in an underwater cable system in accordance with Modality 3 of the present invention; Figure 7 is a brief schematic diagram of an RPT in an underwater cable system in accordance with Modality 4 of the present invention; figure 8 is another brief schematic diagram of a TOR in an underwater cable system according to Modality 4 of the present invention; Figure 9 is a brief schematic diagram of a method for locating an underwater cable fault in accordance with Modality 5 of the present invention; Figure 10 is a brief schematic diagram of a method for locating an underwater cable fault in accordance with Modality 6 of the present invention; and Figure 11 is a brief schematic diagram of a method for locating an underwater cable fault in accordance with Modality 7 of the present invention. DETAILED DESCRIPTION OF THE MODALITIES
[0015] The following detailed description is given in conjunction with the associated drawings to provide a clear and complete understanding of the present invention. Of course, the described modalities are merely part of, rather than all of the modalities of the present invention. All other modalities, which can be derived by those of ordinary skill in the art from the modalities of the present invention without creative efforts, must fall within the scope of protection of the present invention. Mode 1
[0016] One embodiment of the present invention provides a communication system. As shown in figure 4, the communication system includes an SLTE 401 and an RPT 402.
[0017] The SLTE 401 is configured to obtain a section to which a fault location belongs and to send a location detection execution command to RPT 402 in the section; the receipt of time T1 and time T3 which are sent by RPT 402, or the receipt of a time difference which is between time T3 and time T1 and sent by RPT 402; obtaining the fault location according to a formula d = (c * t) / (2IOR), and time T1 and time T3 or the time difference between time T3 and time T1, where d represents a distance between a location of generation of the probe light pulse and the location of the fault, c represents a speed of light propagation in the vacuum, t = T3 - T1, and IOR refers to an index of refraction of means of transmission.
[0018] It should be noted that SLTE 401 can obtain the section to which the fault location belongs as follows: sending a query command to RPT 402, receiving a response command sent by RPT 402, and determining, accordingly with an input light power and an output light power which are from RPT 402 and included in the response command, of the section to which the fault location belongs.
[0019] The SLTE 401 can also obtain the stretch to which the fault location belongs according to the prior art. For example, due to the fact that the RPT in this communication system is subsea and is not suitable for communicating with the SLTE 401 directly. In order to check and control the status of subsea devices, an intelligent subsea cable monitoring device (the subsea intelligent cable monitoring device can be integrated into the SLTE 401, or it can be a standalone device independent of the SLTE 401; in this mode, the intelligent submarine cable monitoring device is integrated into the SLTE 401 for ease of understanding) controls the SLTE 401 to send a query command, and the query command is transmitted to each subsea device via an optical path or a feeder system . Upon receipt of the query command, the subsea devices perform the corresponding query or control operations, according to the query command corresponding to their respective address codes, and then send a response command that carries the result of the query. consultation or control for the SLTE 401 through the optical path or the feeder system. The intelligent submarine cable monitoring device can locate the section on which the fault of the submarine device is located quickly by consulting the input light power and the output light power of each RPT. However, the distance between stretches usually reaches kilometers or even more than a hundred kilometers. Therefore, the intelligent submarine cable monitoring device can know the section in which the fault is located, and can know an RPT 402 identifier which is closest to the fault location in this section, and can communicate with the SLTE 401. Therefore, SLTE 401 can notify RPT 402 which is closest to the fault location and can communicate with SLTE 401 to perform location detection.
[0020] The RPT 402 is configured to receive the location detection execution command sent by SLTE 401; trigger the generation of the probe light pulse according to the location detection execution command received; transmitting the probe light pulse to the fault location along an SLTE 401 sending direction; record the time T1 of the output of the probe light pulse; detecting the reflected probe light pulse from the fault location; and obtaining the T3 probe pulse pulse detection time; and send time T1 and time T3 to SLTE 401 or send the time difference between time T3 and time T1 to SLTE 401.
[0021] It should be noted that the RPT 402 can trigger the generation of the probe light pulse according to the location detection execution command received from the SLTE 401, and perform a location detection. The RPT 402 can obtain the distance between the RPT 402 and the fault according to the formula d = (c * t) / (2IOR) from the time spent in transmitting the probe light pulse and the light transmission rate in the transmission medium. Because the location of the RPT 402 in relation to the SLTE 401 is known, the fault location can be easily located. For a detailed description of RPT 402, a reference can be made to a RPT described in Mode 2, Mode 3 and Mode 4 below.
[0022] In the communication system provided in the modality of the present invention, the communication system first locates the subpixel stretch in which the fault location is located, and controls, according to a RPT 402 in the stretch, an internal component for the extraction of a pulse of light, which is incident at the fault location as a probe light pulse. The RPT 402 obtains the time difference between the probe light pulse and the reflected light pulse, and sends the time difference to the terrestrial SLTE 401. In this way, the SLTE 401 can easily locate the fault according to the principles of the OTDR. If compared to the prior art, the method can locate undersea cable faults more quickly and accurately, so that maintenance personnel can maintain the undersea cable in time. Mode 2
[0023] One embodiment of the present invention provides a TOR. As shown in figure 5, the RPT includes a detection unit 501 and a sending unit 502.
[0024] The detection unit 501 is configured to receive a location detection execution command sent by an SLTE; trigger the generation of a probe light pulse according to the location detection execution command received; transmitting the probe light pulse to a fault location along an SLTE sending direction; recording the start time T1 and the end time T2 for extracting the probe light pulse; detecting the reflected probe light pulse from the fault location; and obtain the T3 detection time of the probe light pulse.
[0025] The detailed solution of the detection unit 501 in the RPT being configured to receive the location detection execution command sent by the SLTE can be implemented through a joint work of a pump laser, an EDFA and a controller. The pump laser is connected to the EDFA and controlled by the controller, and the pump laser emits a laser light to the EDFA. Therefore, the RPT can amplify the received optical signal, and the optical signal (information carried on the optical signal can be the location detection execution command) can be received. This part of the solution can be the same as that of the prior art. For more details, see the prior art.
[0026] It should be noted that the detailed implementation solution of the detection unit 501 being configured to trigger the generation of the probe light pulse may include: a pump laser, an EDFA, an optical switch and a controller.
[0027] The pump laser is configured to generate pump light and introduce the generated pump light into the EDFA. The EDFA is configured to, according to the introduced pump light, amplify and extract the optical signal introduced in the EDFA.
[0028] The optical switch is configured to, according to the control of the controller, establish a connection between the EDFA and the fault location at time T1 and cut the connection between the EDFA and the fault location at time T2, in order to generate a probe light pulse whose pulse width is T2 - T1.
[0029] The controller is configured to, according to the location detection execution command received, control the optical switch to establish a connection between the EDFA on RPT1 and the fault location at time T1 and cut the connection between the EDFA and the location of the fault at time T2.
[0030] The pump laser, the EDFA, the optical switch and the controller work together to carry out the preceding trigger function of the generation of the probe light pulse.
[0031] The detailed implementation solution of the detection unit 501 being configured to trigger the generation of the probe light pulse can include a pump laser, an EDFA and a controller (which will be described in detail together with figure 7 and figure 8 and the modalities shown in figure 7 and in figure 8 subsequently).
[0032] Sending unit 502 is configured to send time T1 and time T3 to SLTE, or to send the time difference between time T3 and time T1 to SLTE, where SLTE obtains the fault location according to a formula d = (c * t) / (2IOR), where d represents a distance between a generation location of the probe light pulse and the fault location, c represents a speed of light propagation in a vacuum, t = T3 - T1, and IOR refers to an index of refraction of means of transmission.
[0033] The detailed solution of the sending unit 502 in RPT can be implemented by an EDFA (for details, see a fourth EDFA in figure 6, figure 7 and figure 8).
[0034] In the RPT provided in the modality of the present invention, the RPT can emit a probe light pulse, obtain the probe light pulse emission time T1, obtain the reflected probe light pulse time T3 from the location of the fault, and send the obtained T1 and T3 to the SLTE, in order to locate the fault accurately in accordance with the OTDR principles. If compared to the prior art, SLTE is able to locate the fault of the submarine cable more quickly and accurately, so that maintenance personnel can maintain the submarine cable in time.
[0035] The logic units in a RPT provided in the embodiment of the present invention are described above. It is not easy to demonstrate logical units to a third person in the form of visible entities. Therefore, the logical units are detailed below with reference to a TOR provided in Mode 3 and Mode 4. Mode 3
[0036] One embodiment of the present invention provides a TOR. As shown in figure 6, a RPT detection unit 501 includes a first pump laser 601, a first EDFA 602, an optical switch 603, a first probe 604 and a first controller 605. The sending unit 502 specifically includes a fourth EDFA 606.
[0037] The first pump laser 601 is configured to generate pump light according to a control of the first controller 605, and to allow the generated pump light to be incident on the first EDFA 602 and the fourth EDFA.
[0038] The first EDFA 602 is configured to use the pump light generated by the first pump laser 601 to amplify the optical signal which is sent by the SLTE, and includes a location detection execution command, and to input the amplified optical signal to the first controller 605; and use the pump light generated by the first pump laser 601 to extract pump light.
[0039] The optical switch 603 is configured, according to the control of the first controller 605, to establish a connection between the first EDFA 602 and the location of a fiber cut in time T1 to time T2, so that the first EDFA 602 extract a probe light pulse whose pulse width is T2 - T1; and for establishing a connection between the first probe 604 and the fault location (specifically, point A) at time T2.
[0040] The first probe 604 is configured to establish a connection between the first probe 604 and the fault location at time T2, and to detect the reflected probe light pulse from the fault location.
[0041] The first probe 604 detects the reflected probe light pulse from the fault location by converting the probe light pulse into an electrical pulse and then introducing the electrical pulse to the first controller 605.
[0042] The first controller 605 is configured to obtain, according to the location detection command, the T3 detection time of the light pulse, and to send a detection result to the first pump laser 601.
[0043] The first controller 605 at RPT performs processing, such as amplification, filtration and conversion from analog to digital on the obtained electrical pulse, in order to obtain the T3 time. The speed of the processing by the first controller 605, such as amplification, filtration and conversion from analog to digital in the electrical pulse obtained, in the electrical pulse obtained by the first probe 604 is so fast that the time spent can be ignored. Therefore, time T3 is roughly considered to be the time when the first probe 604 detects the reflected light pulse.
[0044] The fourth EDFA is configured to send the detection result to the SLTE by using the pump light sent by the first pump laser 601.
[0045] The preceding detection result can include the start time T1 of extraction of the light pulse from the first EDFA 602 and the detection time T3 of the light pulse reflected by the first probe 604, or it can be the value of T3 - T1. Upon receipt of the detection result, the SLTE can locate the submarine cable failure quickly and accurately in accordance with OTDR principles.
[0046] In the RPT provided in the mode of the present invention described above, the submarine cable receives a location detection command, the first controller 605 controls the optical switch 603 to extract a light pulse as a probe light pulse which is incident to the fault location; the controller obtains the time difference between the probe light pulse and the reflected light pulse, and sends the time difference to the terrestrial SLTE; and SLTE can easily locate the fault according to OTDR principles. If compared to the prior art, RPT can obtain the parameters (T1 and T3 or the value of T3 - T1) for the location of underwater cable faults more quickly and accurately, and a terrestrial device can locate the cable fault submarine according to the parameters, so that maintenance personnel can maintain the submarine cable in time. Mode 4
[0047] One embodiment of the present invention provides a TOR. As shown in figure 7, the RPT detection unit 501 specifically includes a second pump laser 701, a second EDFA 702, a second circulator 703, a second probe 704, and a second controller 705. The sending unit 502 specifically includes an EDFA 706 room.
[0048] The second pump laser 701 is configured to generate, according to the control of the second controller 705, a pump light as a probe light pulse at time T1 to time T2, and to allow the probe light pulse to be incident on the second EDFA 702; the pump light is generated according to the control of the second controller 705 and incident on the second EDFA 702.
[0049] The second EDFA 702 is the same as the first EDFA 602 described in Mode 3. For details, see Mode 3.
[0050] The functions of the second pump are similar to those of the second pump 703 described in Modality 3. The second pump 703 is configured to establish a connection between an outlet end of the second EDFA 702 and the location A of the fault, the introduction of the pulse. probe light at the fault location, the establishment of a connection between the second probe 704 and the fault location, and the introduction of the probe light pulse reflected in the second probe 074, after the probe light pulse is reflected at from the fault location.
[0051] Therefore, the second probe 704 is configured to detect, according to the connection which is established by the second circulator 703 and between the second probe 704 and the fault location, the probe light pulse reflected from the fault location.
[0052] The second controller 705 is configured to control, according to the location detection command, the second pump laser 701 to generate the pump light as a probe light pulse at time T1 to time T2; obtain the T3 time for the detection of the light pulse, and send a detection result to the fourth 706 laser pump.
[0053] The fourth EDFA 706 is the same as the fourth EDFA 6 06 described in Modality 3, and is not repeatedly described here.
[0054] In the RPT provided in the embodiment of the present invention described above, the probe light pulse obtains a location detection execution command, controls the on / off status of the second pump laser 701 through the second controller 705 for the extraction of a pulse light as a probe light pulse which is incident at the fault location; the second controller 705 obtains the time difference between the probe light pulse and the reflected light pulse, and sends the time difference to the terrestrial SLTE; and SLTE can easily locate the fault according to OTDR principles. If compared to the prior art, RPT can obtain the parameters (T1 and T3 or the value of T3 - T1) for the location of underwater cable faults more quickly and accurately, and a terrestrial device can locate the cable fault submarine according to the parameters, so that maintenance personnel can maintain the submarine cable in time.
[0055] Optionally, the RPT detection unit 501 provided in this embodiment can still include a pulse width control unit 807, as shown in figure 8. The pulse width control unit 807 and a third circulator 803 work together to implementation of the functions of the optical switch 603 provided in Mode 3. That is, the pulse width control unit 807 is configured to establish a connection between the third EDFA 802 and the fault location in time T1 for time T2, and the third pump laser 801 can always be connected for the introduction of pump light in the third EDFA 802. The second circulator is the same as the third circulator.
[0056] After the pulse width control unit 807 is added, other units in the RPT include the third pump laser 801, the third EDFA 802, the third probe 804, the third controller 805 and the fourth EDFA 806, which are correspondingly the same as the first pump laser 601, the first EDFA 602, the first probe 604, the first controller 605 and the fourth EDFA 606 described in Mode 3, which are not repeatedly described here.
[0057] Through the 807 pulse width control unit added in this modality, the probe light pulse is generated without activating or deactivating the pump laser in the RPT, which reduces the wear of the pump laser and prolongs the laser's life. pump. The 807 pulse width control unit can be implemented by a modulator or attenuator, or another optical component with the same functions.
[0058] It should be noted that the first EDFA 602, the second EDFA 702 and the third EDFA 802 are the same; and the first pump laser 6 01, the second pump laser 701 and the third pump laser 801 are also the same. They are named differently for ease of distinction in figure 6, figure 7 and figure 8. Mode 5
[0059] One embodiment of the present invention provides a method for locating an underwater cable failure. As shown in figure 9, the method includes: Step S1: an RPT on a stretch to which a fault location belongs receives a location detection execution command sent by an SLTE.
[0060] It should be noted that, due to the fact that the RPT in this communication system is subsea and not suitable for communication directly with the SLTE, in order to consult and control the status of subsea devices, an intelligent subsea cable monitoring device (the intelligent submarine cable monitoring device can be integrated into the SLTE, or can be a standalone device independent of the SLTE; in this mode, the intelligent submarine cable monitoring device is integrated into the SLTE for ease of understanding) controls the SLTE to send a command query, and the query command is transmitted to each subsea device via an optical path or a feeder system. Upon receipt of the query command, the subsea devices perform the corresponding query or control operations, according to the query command corresponding to their respective address codes, and then send a response command that carries the result of the query. consultation or control for the SLTE 401 through the optical path or the feeder system. The intelligent submarine cable monitoring device can locate the section on which the fault of the submarine device is located quickly by consulting the input light power and the output light power of each RPT. However, the distance between stretches usually reaches kilometers or even more than a hundred kilometers. Therefore, the intelligent submarine cable monitoring device can know the section on which the fault is located, and can know an RPT identifier which is closest to the location of the fault on this section, and can communicate with the SLTE. Therefore, the SLTE can notify the RPT which is closest to the fault location and can communicate with the SLTE to perform location detection.
[0061] The location detection execution command can include an identifier which belongs to the RPT in the section to which the fault location belongs and determined by the SLTE, so that the RPT compares its own identifier with the RPT identifier in the execution execution command. Location detection received to judge whether it is to perform the task of software probe. If the identifiers are the same, RPT will carry out the subsequent operations; if the identifiers are different, RPT will not carry out a subsequent operation. Step S2: trigger the generation of a probe light pulse according to the location detection execution command received.
[0062] For ease of understanding, in step S2, it should be noted that the RPT can compare its own identifier with the identifier which belongs to the RPT in the section to which the fault location belongs, and determined by the SLTE and in the command of detection detection execution. location, and trigger the generation of the probe light pulse, if the identifiers are the same. Step S3: transmit the probe light pulse to the fault location along an SLTE sending direction.
[0063] It should be noted that, of the two RPTs that are on the stretch to which the fault location belongs and are determined by the SLTE, the RPT being the closest to the SLTE is generally selected for detection (specifically, the fault is not among the SLTE and the RPT that performs the detection). However, the embodiment of the present invention is not limited to the foregoing description. Step S4: record the start time T1 and the end time T2 of extraction of the probe light pulse.
[0064] The RPT can control the pulse width (specifically, T2 - T1) of the generated probe light pulse, the specific pulse width is decided according to the requirements of designers. Step S5: detects the reflected probe light pulse from the fault location, and obtain the T3 probe light pulse detection time. Step S6: send time T1 and time T3 to SLTE, or send a time difference between time T3 and time T1 to SLTE, where SLTE obtains the fault location according to a formula d = (c * t) / (2IOR), where d represents a distance between a generation location of the probe light pulse and the fault location, c represents a speed of light propagation in a vacuum, t = T3 - T1, and IOR refers up to a refractive index of means of transmission.
[0065] The preceding formula is the subject of OTDR principles. It should also be noted that t is the total time (half of the cet product is a one-way distance, specifically, t = T3 - T1) from sending the signal to receiving the signal (total time to and from return); IOR is the refractive rate of transmission medium, and is usually provided by the fiber manufacturer. Because the speed of light property in glass is slower than in vacuum, the distance of light transmission can be calculated using this formula. It should also be noted that, in the embodiment of the present invention, d represents a distance from RPT that emits the probe light pulse to the location of the fault. Because the location of each RPT in the submarine cable system is known, the fault location is easily located after the distance d from the RPT that emits the probe light pulse until the fault location is obtained.
[0066] In the method of locating a fault in an underwater cable provided in the embodiment of the present invention, RPT controls the internal component for the extraction of a pulse of light as a pulse of probe light which is incident to the location of the fault; the RPT obtains the time difference between the probe light pulse and the reflected light pulse, and sends the time difference to the terrestrial SLTE; and SLTE can easily locate the fault according to OTDR principles. If compared to the prior art, the method can locate the undersea cable failure more quickly and accurately, so that maintenance personnel can maintain the undersea cable in time. Mode 6
[0067] One embodiment of the present invention provides a method for locating an underwater cable failure. The method is similar to the method provided in the previous Modality 5, but differs in that the method for locating a fault in an underwater cable provided in this modality is preferable.
[0068] The embodiment of the present invention is described in detail with reference to a TPR module shown in figure 6 and a brief diagram of a method according to an embodiment of the present invention shown in figure 10, and the method includes the following steps: Step A1: the same as step S1 in Mode 5, a RPT on a stretch to which a fault location belongs receives a location detection execution command sent by an SLTE.
[0069] The SLTE sends the location detection execution command to the RPT at the beginning location of the section. The start location refers to the RPT before the fault location in the direction of sending the optical signal. As shown in figure 6, if the fault is located between a first EDFA 602 in a downlink direction and a downlink EDFA specifically, the fault location (fiber cut A); the first EDFA 602 and the fourth EDFA 606 are located in one RPT, and the downlink EDFA and an uplink EDFA are located in another RPT. The subsea cable monitoring device (the subsea cable monitoring device can be integrated into the SLTE or standalone) sends the location detection execution command to the RPT in which the first EDFA 602 is located, and the RPT performs an operation subsequent fault location. The location detection execution command can include, specifically: an identifier which is from the RPT in the section to which the fault location belongs and determined by the SLTE, so that the RPT that receives the location detection execution command compares its own identifier with the RPT identifier in the received location detection execution command. If the identifiers are the same, RPT will carry out subsequent operations; if the identifiers are different, RPT will not carry out a subsequent operation. Step A2: after the RPT receives the command to execute location detection, a first pump laser 601 in the RPT generates a pump light, and introduces the pump light in a first EDFA 602 in the RPT; an optical switch 603 in the RPT, according to the control of the first controller 605, establishes a connection between the first EDFA 602 in the RPT and the fault location at time T1 and cuts the connection between the EDFA and the fault location at time T2 , in order to generate a probe light pulse whose pulse width is T2 - T1. Step A3: Transmission of the probe light pulse to the fault location along an SLTE sending direction. Step A4: record the T1 extraction time of the probe light pulse.
[0070] Specifically, step A4 can be performed by the controller at RPT. In step A2, in the direction of sending the SLTE, the light pulse with a pulse width of T2 -T1 extracted from the first EDFA 602 in the RPT is the optical signal extracted by the submarine cable system normally. As shown in figure 6, in the direction of sending the SLTE, the fiber A cut is located after the RPT, and therefore in the RPT, the fiber A cut is located after the RPT and therefore in the RPT, a signal Normal optical and a pump laser light are introduced into the first EDFA 602, and the first EDFA 602 extracts the amplified optical signal. Step A5: optical switch 603 on the RPT establishes a connection between the first probe 604 on the RPT and the fault location at time T2, and introduces the reflected light pulse from the fault location on the first probe 604.
[0071] Step A5 is performed because a Fresnel reflection of light is quite strong at the fault location (such as a fiber cut). The RPT introduces the reflected optical signal from the fault location on the first probe 604 in the RPT. As shown in figure 6, an optical switch is used in the RPT. Optical switch 603 establishes a connection between an output end of the first EDFA 602 and the fiber A cut at time T1, and cuts the connection between the output end of the first EDFA 602 and a fiber A cut at time T2. Therefore, a pulse of light whose pulse width is T2 - T1 is transmitted to the fiber A cut; meanwhile, at time T2, the optical switch establishes a connection between the fiber A cut and the first probe 604 in the RPT, so that the light pulse whose pulse width is T2 - T1 can be reflected from the cut of fiber A for the first probe 604 through Fresnel reflection. Step A6: the first probe 604 in the RPT detects the reflected probe light pulse from the fault location, and the controller in the RPT obtains the T3 detection time of the light pulse.
[0072] In step A6, the first 6 04 probe in the RPT converts the incoming light pulse into an electrical pulse; the first controller 605 at RPT performs processing, such as amplification, filtration and conversion from analog to digital on the electric pulse obtained, in order to obtain the T3 time. The speed of realization by the processing controller of this amplification, filtration and conversion from analog to digital in the electric pulse obtained by the first probe 604 is so fast that the time spent can be ignored. Therefore, T3 is roughly considered to be the time when the first probe 604 detects the reflected light pulse. Step A7: RPT sends a detection result to the SLTE, where the detection result is the T1 start time of light pulse extraction by the first EDFA 602 and the T3 light pulse detection time reflected by the first probe 604 Therefore, SLTE obtains the fault location according to a formula d = (c * t) / (2IOR), where d represents a distance between a generation location of the probe light pulse and the fault location, c represents a speed of light propagation in vacuum, t = T3 - T1, and IOR refers to an index of refraction of transmission media.
[0073] As shown in figure 6, the RPT in step A7 can send T1 and T3 to the SLTE as the detection result as follows: the first controller 605 in the RPT modulates the detection result in the first pump laser 601, and the first pump laser 601 modulates the detection result in the light extracted by the fourth EDFA 606 by modulating the gain of the fourth EDFA 606, and the detection result is finally transmitted to the SLTE. The detection result in step A7 can also be sent by the SLTE according to the prior art.
[0074] It should be noted that the detection result sent by RPT to the SLTE in step A7 can also be the value of T3 - T1. The RPT device is submarine, and its designed circuits must be as simple as practicable to improve reliability. Therefore, operations at RPT should be minimized. For example, the calculation of the accurate location of the submarine cable failure is not necessarily performed at RPT according to OTDR principles, and the resources of the first controller 605 at RPT can be saved; instead, the required parameters (T3 and T1 or the value of T3 - T1) are sent to the terrestrial SLTE, and the accurate location of the submarine cable fault is calculated.
[0075] In the method for locating a fault in an underwater cable provided in the mode of the present invention described above, the section in which the fault is located is found first, and the RPT in the section controls a first EDFA within the RPT for the extraction of a pulse. of light, which is incident on the location of the fault as a probe light pulse; in this way, RPT obtains the time difference between the probe light pulse and the reflected light pulse, and sends the time difference to the terrestrial SLTE. In this way, SLTE can easily locate the fault according to OTDR principles.
[0076] However, in the prior art, the probe light pulse must make a complete round-trip path between the SLTE and the fault location. In the prior art, multiple EDFAs are regulated in the path between the SLTE and the fault location, and the reflected probe light pulse finally accumulates a lot of ASE noise, and the SLTE needs to perform multiple averaging operations to improve the ratio of signal for noise from the received probe light pulse and finally locate the fault. If compared to the prior art, the method can locate the undersea cable failure more quickly and accurately, so that maintenance personnel can maintain the undersea cable in time. Mode 7
[0077] One embodiment of the present invention provides a method for locating an underwater cable failure. The method is similar to the method provided in the previous Modality 6, but differs in that: this modality primarily describes how RPT controls EDFA for the extraction of the light pulse whose pulse width is T2 - T1.
[0078] The embodiment of the present invention is described in detail with reference to a RPT module shown in figure 7 and a brief diagram of a method according to a embodiment of the present invention shown in figure 11, and the method includes the following steps: Step B1: the same as step A1 in Mode 6, an RPT on a stretch to which a fault location belongs receives a location detection execution command sent by an SLTE. The location detection execution command at least carries information about an identifier which is from the RPT in the section to which the fault location belongs and determined by the SLTE. Step B2: after the RPT receives the command to execute the location detection, a second controller 705 in the RPT exercises the control to activate a second pump laser 701 at time T1, deactivating the second pump laser 701 at time T2, in order to generate a pump light whose pulse width is T2 - T1. The pump light is introduced in a second EDFA 702 in the RPT; and the second EDFA 702 extracts the probe light pulse.
[0079] As shown in figure 7, the probe light pulse extracted by the second EDFA 7 02 in the RPT is obtained by controlling the activated / deactivated state of the second pump laser 701. A second circulator 703 is regulated in an output port of the second EDFA 7 02 for the extraction of light pulses whose pulse width is T2 - T1 for the location of the fault, and perform step B3 below.
[0080] It should be noted that, before time T1, the second pump laser 701 is off, but some optical signals are still incident from the SLTE to the second EDFA 702, and are extracted from the second EDFA 702 to the fault location A. Because no pump light is incident, the second EDFA 702 does not amplify the incident optical signal from the SLTE, and the erbium-doped fiber attenuates the optical signal dramatically. Therefore, the optical signal is attenuated massively over the distance from the second EDFA 702 and the fault location A, and the second probe 704 is unable to detect the optical signal. Therefore, if no pump light exists, it will be judged that no probe light pulse exists in the RPT. Step B3: same as step A3 in Mode 6, transmission of the probe light pulse to the fault location along an SLTE sending direction. Step B4: same as step A4 in Mode 6, record the T1 extraction time of the probe light pulse. Step B5: establishing a connection between the second probe 704 in the RPT and the fault location through the second circulator 703 in the RPT, and introducing the probe light pulse reflected from the fault location to the second probe 704.
[0081] In step B2 and step B3 described above with reference to figure 7, the second pump laser is activated at time T1 and deactivated at time T2 for the generation of a probe light pulse whose pulse width is T2 - T1; the second circulator is added after an outlet end of the second EDFA to reflect the probe light pulse from the fault location to the second probe. That is, the second circulator establishes a connection between the second probe in RPT3 and the fault location.
[0082] It should also be noted that the erbium ion has a lifetime at the previous energy level, the second EDFA does not extract anything at the moment of activation in the second pump laser. Therefore, a fixed delay exists, and the fixed response delay between the second pump laser and the output of the second EDFA needs to be taken into account when locating the fault according to the T3 - T1 time difference shown in figure 7 The delay t 'can be measured beforehand, and is subtracted from the result of T3 - T1. Delay t 'is the time taken from the second pump laser to send the pump light until the second EDFA extracts the probe light. Step B6: the second probe 704 in the RPT detects the reflected probe light pulse from the fault location, and the controller in the RPT obtains the T3 detection time of the light pulse. Step B7: RPT sends a detection result to the SLTE, where the detection result is the T1 start time of light pulse extraction by the second EDFA 702 and the T3 light pulse detection time reflected by the second probe 704 Therefore, SLTE obtains the fault location according to a formula d = (c * t) / (2IOR), where d represents a distance between a generation location of the probe light pulse and the fault location, c represents a speed of light propagation in vacuum, t = T3 - T1, and IOR refers to an index of refraction of transmission media.
[0083] In the method for locating a fault in an underwater cable provided in the mode of the present invention described above, the section in which the fault is located is found first and the RPT in the section controls a first EDFA within the RPT for the extraction of a pulse from light, which is incident at the fault location as a probe light pulse; in this way, RPT obtains the time difference between the probe light pulse and the reflected light pulse, and sends the time difference to the terrestrial SLTE. In this way, SLTE can easily locate the fault according to OTDR principles. If compared to the prior art, the method can locate the undersea cable failure more quickly and accurately, so that maintenance personnel can maintain the undersea cable in time.
[0084] Optionally, in the method of fault location of an underwater cable provided in Mode 7 of the present invention, the on / off state of the second pump laser is controlled to generate a probe light pulse, which, however, shortens the service life of the second pump laser. Therefore, an embodiment of the present invention also provides an alternative solution. As shown in figure 8, a pulse width control unit 807 is added between an outlet end of the third EDFA 802 and the third circulator. Under the control of the pulse width control unit 807, the probe light pulse whose pulse width is T2 - T1 can be transmitted to the fault location from the third EDFA 802, and the probe light pulse can be transmitted. be reflected from the fault location for the third probe 804. That is, the third circulator 803 establishes a connection between the third probe 804 in RPT4 and the fault location. It can be easily known from comparing figure 7 and figure 8 that the solution provided in the embodiment shown in figure 8 adds a pulse width control unit 807 based on the solution shown in figure 7; under the control of the third controller 805, the pulse width control unit 807 extracts the probe light pulse whose pulse width is T2 - T1.
[0085] The 807 pulse width control unit can be implemented by a modulator or an attenuator. The pulse width control unit is similar to an optical switch. For example, the third control unit controls the attenuator, so that the attenuator attenuates the fiber to a small extent in the duration of time T1 through time T2, and the probe light pulse can be transmitted to the location of the failure through the attenuator, but the attenuator attenuates the fiber to a great extent at another time, and no probe light can be transmitted to the fault location. The modulator can also implement functions that are the same as those of the attenuator. Therefore, the workaround shown in figure 8, in which the probe light pulse is generated according to the location detection execution command includes:
[0086] After the RPT receives the command to execute location detection, the third pump laser 801 generates a pump light, and introduces the pump light into the third EDFA 802. The 807 pulse width control unit, according to control of the third controller 805, establishes a connection between the third EDFA 802 and the fault location at time T1 and cuts off the connection between the third EDFA 802 and the fault location at time T2, in order to generate a probe light pulse whose pulse width is T2 - T1.
[0087] Determination of the reflected probe light pulse from the fault location includes: A third circulator 803 in the RPT establishes a connection between the third probe 804 in the RPT and the fault location, and introduces the probe light pulse reflected from the fault location in the third probe 804. Therefore, the third probe 804 detects the probe light pulse reflected from the fault location.
[0088] In this embodiment, a third circulator 803 is added to the RPT; under the control of the third controller 805 at RPT, the pulse width control unit extracts a probe light pulse whose pulse width is T2 - T1, which replaces the probe light pulse generated by the on / off state control disconnected from the second pump laser, and the life of the pump laser is extended, the subsea device is more stable, and the communication quality of the subsea communication system is improved. Mode 8
[0089] One embodiment of the present invention provides a method for locating an underwater cable failure. The method is similar to the method provided from Mode 5 to Mode 7, but differs in that: the method in this mode is based on and preferable to Mode 5 over Mode 7.
[0090] The method includes the following steps: Step C1: the same as step A1 in Mode 6, a RPT on a stretch to which a fault location belongs receives a location detection execution command sent by an SLTE. The location detection execution command at least carries information about an identifier which is from the RPT in the section to which the fault location belongs and determined by the SLTE. Step C2: according to the location detection execution command received, the RPT (the RPT here can be any of the RPTs shown in figure 6, figure 7 and figure 8), by using a pump laser on the RPT, extracts a light pulse whose pulse width is T2 - T1 from an EDFA (the EDFA can be any one of the first EDFA shown in figure 6, the second EDFA in figure 7 and the third EDFA in figure 8) in the RPT for the fault location in an SLTE sending direction, where the pump laser uses its maximum optical power for the extraction of the light pulse.
[0091] The pump laser uses the maximum optical power for the extraction of the light pulse for the first EDFA, so that the signal from the probe light pulse extracted from the EDFA is strong, and the reflected probe light pulse can be easily detected by the probe (the probe here can be any one of the first probe, the second probe and the preceding third probe), and the error of the T3 time obtained is minimized. Step C3: same as step S3 in Mode 5, transmission of the probe light pulse to the fault location along an SLTE sending direction. Step C4: the detection by the probe in the RPT, of a pulse of light reflected from the fault location specifically includes: obtaining an amplitude of the optical signal detected from time (T1 + Y) to time (T1 + Z) , where Y and Z are not variables. Step C5: RPT repeats from step C2 to step C4 for generating probe light pulses N times, transmits the probe light pulses to the fault location along the SLTE sending direction, records the time and start Tn1 and end time Tn2 of extraction of the probe light pulses, where (Tn2 -Tn1) is a constant greater than 0; and detects the amplitude of optical signals from time (Tn1 + Y) to time (Tn1 + Z), where X and Y are constant.
[0092] Tn1 is the start time for the extraction of the numbered probe light pulse, Tn2 is the end time for the extraction of the numbered probe light pulse, (Tn1 + Z)> (Tn1 + Y), (Tn1 + Y )> Tn2, and [(Tn1 + Z) - (Tn1 + Y)]>> (Tn2 -Tn1).
[0093] N amplitudes of optical signal detected from time (Tn1 + Y) to time (Tn1 + Z) are averaged, in order to improve the signal-to-noise ratio, and the Tn3 time of light pulse detection numbered probe n is obtained.
[0094] The repetition of step C2 to step C4 in step C5 refers to: the generation of probe light pulses of the same pulse width for N times; recording the Tn1 extraction time of the probe light pulse numbered n; obtaining the pulse amplitude and noise amplitude of the reflected probe light pulse, and calculating the average of the N pulse amplitudes to obtain the pulse amplitude of a single reflected probe light pulse; calculating the average of the N noise amplitudes to improve the signal-to-noise ratio; obtaining the T3N detection time of the probe light pulse numbered N and sending Tn1 and Tn3 to the SLTE. Step C6: RPT uses Tn1 and Tn3 as a detection result, encodes the detection result and sends the encoded detection result to the SLTE. Therefore, SLTE obtains the fault location according to the OTDR principles.
[0095] In step C6, the detection result can be encoded using a raw material detection displacement switch (ASK) or a frequency displacement switch (FSK), and the encoded detection result is modulated for the pump laser, and then transmitted to the SLTE. The detection result can also be a Tn3 - Tn1 value.
[0096] In the method for locating an underwater cable fault provided in the modality of the present invention described above, the section in which the fault is located is found first, and the RPT in the section controls an EDFA within the RPT for the extraction of a pulse. light, which is incident at the fault location as a probe light pulse; in this way, RPT obtains the time difference between the probe light pulse and the reflected light pulse, and sends the time difference to the terrestrial SLTE. In this way, the SLTE can easily locate the fault according to the OTDR principles. If compared to the prior art, the method can locate the undersea cable failure more quickly and accurately, so that maintenance personnel can maintain the undersea cable in time.
[0097] Those skilled in the art should understand that all or part of the steps of the method in the foregoing embodiments of the present invention can be implemented by a program instructing relevant hardware. The program can be stored on a storage medium that can be read on a computer. The storage medium can be a read-only memory (ROM), a random access memory (RAM), a magnetic disk or a read-only compact disk (CD-ROM) memory.
[0098] A method for locating a fault in an underwater cable, an RPT, and a communication system provided in the modalities of the present invention are described above. Although the principles and implementations of the present invention are described through some example modalities, the preceding modalities are merely used to assist in understanding the methods and ideas of the present invention. Meanwhile, those of ordinary skill in the art can make modifications and variations in the detailed modalities and scope of application, without departing from the scope of the present invention. In conclusion, the content of the specification should not be construed as limitations to the present invention.

权利要求:
Claims (14)
[0001]
A method for locating an underwater cable fault comprising: the receipt, by a repeater (RPT) in a section to which a fault location belongs, of a location detection execution command sent by an underwater line terminal (SLTE) equipment (S1, A1, B1); characterized by the fact that: triggering the generation of a probe light pulse according to the location detection execution command received (S2); transmitting the probe light pulse to the fault location along an SLTE sending direction (S3); recording a start time T1 and an end time T2 for extracting the probe light pulse (S4); detecting the reflected probe light pulse from the fault location, and obtaining a T3 probe light pulse detection time (S5); and sending time T1 and time T3 to SLTE, or sending a time difference between time T3 and time T1 to SLTE, where SLTE obtains the fault location according to a formula d = (c * t) / (2IOR), where d represents a distance between a generation location of the probe light pulse and the fault location, c represents a speed of light propagation in vacuum, t = T3 - T1, and index of refraction (IOR), refers to an index of refraction of means of transmission (S6, A7, B7).
[0002]
Method according to claim 1, characterized in that the triggering of the generation of a probe light pulse according to the location detection execution command received specifically comprises: the generation, by a first pump laser at RPT, of a pump light according to the location detection execution command received, and the introduction of the pump light in a first erbium-doped fiber optic amplifier, EDFA, in the RPT; the establishment, by an optical switch in the RPT and according to a control of a first controller in the RPT, of a connection between the first EDFA and the fault location in time T1, and the disconnection of the connection between the first EDFA and the location the failure in time T2, in order to generate a probe light pulse whose pulse width is T2 - T1 (A2); therefore, detecting the reflected probe light pulse from the fault location and obtaining the T3 probe light detection time specifically comprises: the establishment, by the optical switch in the RPT, of a connection between a first probe in the RPT and the location of the fault in time T2, and the introduction of the reflected light pulse from the fault location to the first probe; and the detection, by the first probe, of the probe light pulse reflected from the fault location, and obtaining the T3 probe light pulse detection time (A5, A6).
[0003]
Method according to claim 1, characterized in that the triggering of the generation of a probe light pulse according to the location detection execution command received specifically comprises: the exercise, by a second controller in the RPT and according to the location detection execution command received, of a control to activate a second pump laser in the RPT at time T1 and deactivate the second pump laser at time T2, of in order to generate a pump light whose pulse width is T2 - T1; and the introduction of the pump light in a second EDFA in the RPT, in which the second EDFA extracts the probe light pulse (B2f, B3); therefore, detecting the reflected probe light pulse from the fault location and obtaining the T3 probe light detection time specifically comprises: the establishment, by a second circulator in the RPT, of a connection between a second probe in the RPT and the location of the fault, and the introduction of the reflected probe light pulse from the location of the fault in the second probe, in which the second probe detects the reflected probe light pulse from the fault location and obtains the T3 probe light pulse detection time (B5, B6).
[0004]
Method, according to claim 3, characterized by the fact that, after sending the time difference between time T3 and time T1 to SLTE, the method still comprises: sending a delay t 'to the SLTE, where delay t' is a duration between the second pump laser sending the pump light and the first EDFA extracting the pump light.
[0005]
Method according to claim 1, characterized in that the triggering of the generation of a probe light pulse according to the location detection execution command received specifically comprises: the generation, by a third pump laser in the RPT, of a pump light according to the location detection execution command received, and the introduction of the pump light in a third EDFA in the RPT; the establishment, by a pulse width control unit in the RPT and according to the control of a third controller in the RPT, a connection between the third EDFA and the fault location in time T1, and the disconnection of the connection between the third EDFA and the fault location at time T2, in order to generate a probe light pulse whose pulse width is T2 - T1; therefore, detecting the reflected probe light pulse from the fault location and obtaining the T3 probe light detection time specifically comprise: the establishment, by a third circulator in the RPT, of a connection between a third probe in the RPT and the location of the fault, and the introduction of the reflected light pulse from the fault location in the third probe, in which the third probe detects the reflected probe light pulse from the fault location and obtains the probe light pulse detection time T3.
[0006]
Repeater (RPT), which comprises a detection unit and a sending unit, characterized by the fact that: the detection unit (501) is configured to receive a location detection execution command sent by an underwater line terminal equipment (SLTE); triggering the generation of a probe light pulse according to the location detection execution command received; transmitting the probe light pulse to a fault location along an SLTE sending direction; recording a start time T1 and an end time T2 for extracting the probe light pulse; detecting the reflected probe light pulse from the fault location, and obtaining a T3 probe light pulse detection time; and the sending unit (502) is configured to send the T1 time and the T3 time to the SLTE, or to send a time difference between the T3 time and the T1 time to the SLTE, where the SLTE obtains the location of the failure according to a formula d = (c * t) / (2IOR), where d represents a distance between a generation location of the probe light pulse and the fault location, c represents a speed of light propagation in a vacuum , t = T3 - T1, and a refractive index (IOR) refers to a refractive index of transmission media.
[0007]
Repeater (RPT) according to claim 6, characterized in that the detection unit (501) specifically comprises: a first pump laser (601), a first erbium-doped optical fiber amplifier (EDFA) (602), a optical switch (603), a first probe (604) and a first controller (605); the first pump laser (601) being configured to generate a pump light, and to introduce the pump light into the first EDFA (602); the optical switch (603) being configured to establish a connection between the first EDFA (602) and the fault location at time T1, according to the control of the first controller (605), and the disconnection of the connection between the first EDFA ( 602) and the location of the fault in time T2, in order to generate a probe light pulse whose pulse width is T2 - T1; the optical switch (603) being configured to establish a connection between the first probe (604) and the fault location at time T2, and to introduce the reflected light pulse from the fault location on the first probe (604); the first probe (604) being configured to detect the reflected probe light pulse from the fault location, and to obtain the T3 probe pulse detection time T3.
[0008]
Repeater (RPT) according to claim 6, characterized in that a detection unit (501) specifically comprises: a second pump laser (701), a second erbium-doped optical fiber amplifier, EDFA (702), a second circulator (703), a second probe (704), and a second controller (705) being configured to activate the second pump laser (701) at time T1 and disable the second pump laser (701) at time T2, in order to generate a pump light whose pulse width is T2 - T1; and introducing the pump light into a second EDFA (702), wherein the second EDFA (702) extracts the probe light pulse; the second circulator (703) being configured to establish a connection between the second probe (704) and the fault location, and the introduction of the reflected light pulse from the fault location on the second probe (704), where the second probe (704) detects the reflected probe light pulse from the fault location and obtains the T3 probe pulse detection time T3.
[0009]
Repeater (RPT), according to claim 8, characterized in that the second controller (703) is additionally configured to send a delay t 'to the sending unit (502), in which the delay t' is a duration between the second pump laser (701) sending the pump light and the second EDFA (702) sending the pump light.
[0010]
Repeater (RPT) according to claim 6, characterized in that the detection unit (501) specifically comprises: a third pump laser, a third erbium-doped fiber optic amplifier (EDFA), a control unit for pulse width, a third probe and a third controller; the third pump laser being configured to generate pump light, and to introduce the pump light into the first EDFA; the pulse width control unit being configured to establish a connection between the third EDFA and the fault location at time T1, in order to control the third controller, and cut off the connection between the third EDFA and the fault location at time T2, in order to generate a probe light pulse whose pulse width is T2 - T1; the third circulator being configured to establish a connection between the third probe and the fault location, and insert a reflected probe light pulse from the fault location on the third probe; the third probe being configured to detect the reflected probe light pulse from the fault location; and the obtaining of the probe light pulse detection time T3.
[0011]
Repeater (RPT), according to claim 10, characterized in that the positive potential side control unit is a modulator or an attenuator.
[0012]
Communication system, comprising an underwater line terminal equipment (SLTE) and a repeater (RPT), characterized by the fact that: the SLTE be configured to obtain a section to which a fault location belongs, and to send a location detection execution command to an RPT on the section; the receipt of time T1 and time T3 which are sent by RPT, or the receipt of a time difference which is between time T3 and time T1 and is sent by RPT; obtaining the fault location according to a formula d = (c * t) / (2IOR) and time T1 and time T3 or the time difference between time T3 and time T1, where d represents a distance between a probe light pulse generation location and the fault location, c represents a speed of light propagation in vacuum, t = T3 - T1, and refractive index (IOR), refers to a refractive index of means of transmission; and the RPT be configured to receive a location detection execution command sent by SLTE; triggering the generation of a probe light pulse according to the location detection execution command received; transmitting the probe light pulse to the fault location along an SLTE sending direction; recording a T1 start time of emission of the probe light pulse; detecting the reflected probe light pulse from the fault location; obtaining a T3 detection time for the probe light pulse; and sending time T1 and time T3 to SLTE or sending the time difference between time T3 and time T1 to SLTE.
[0013]
System, according to claim 12, characterized by the fact that the SLTE is being configured to obtain the section to which the fault location belongs: sending a query command to RPT, receiving a reply command sent by RPT, and the determination of the section to which the fault location belongs according to the input location power and the output light power which are from the RPT and included in the response command.
[0014]
System according to claim 12, characterized by the fact that the RPT is the RPT as defined in any of claims 6 to 11.

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同族专利:

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公开号 | 公开日

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CN102025416A|2011-04-20|

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EP2472782B1|2014-06-04|

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EP2472782A1|2012-07-04|

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AU2010297750B2|2014-01-30|

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US9203510B2|2015-12-01|

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CN102025416B|2013-12-04|

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JP2013505654A|2013-02-14|

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AU2010297750A1|2012-05-17|

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JP5447894B2|2014-03-19|

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US20120182023A1|2012-07-19|

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EP2472782A4|2012-10-17|

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WO2011035687A1|2011-03-31|

---

BR112012006471A2|2016-04-26|

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法律状态:
2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-01-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-01-21| B15K| Others concerning applications: alteration of classification|Free format text: A CLASSIFICACAO ANTERIOR ERA: H04L 12/24 Ipc: H04B 10/071 (2013.01), G01M 11/00 (2006.01) |

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2021-02-23| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-03-23| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 23/03/2021, OBSERVADAS AS CONDICOES LEGAIS. |

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CN2009101739490A|CN102025416B|2009-09-22|2009-09-22|Method, repeater and communication system for positioning submarine cable failure|

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