韩国专利KR20030021199A The planer lightwave circuit type splitter for monitor and signal wavelength division coupler

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专利摘要:
The present invention is a technology for manufacturing the device with the advantage that the size is small by the hybridization, the change in the optical properties according to the temperature is little, without changing the characteristics of the existing components, the components produced by the present invention is inexpensive, high Its purpose is to make the integrated parts easily by using the reflecting film and combine it with the optical splitter and the high reflecting filter, and to mass production at low cost.
公开号:KR20030021199A
申请号:KR1020030007313
申请日:2003-02-06
公开日:2003-03-12
发明作者:한권훈；장선주；이경구；김용원
申请人:주식회사 와이티테크놀로지；
IPC主号:

专利说明:

The planer lightwave circuit type splitter for monitor and signal wavelength division coupler}
[14] The present invention relates to an optical splitter used in a passive optical distribution network (PON), and more particularly, to a product that is hybridized by using a thin film filter and a waveguide and maximized the efficiency of a package to reduce the cost.
[15] Hereinafter, described in detail by the accompanying drawings as follows.
[16] This invention is an element applied to a passive light distribution network. Passive Optical Distribution Network, or PON (Passive Optical Network), is a very economical optical subscriber network structure to realize fiber to the home (FTTH) and fiber to the cab (FTTCab).
[17] In order for the passive optical distribution network to have high quality and reliability, the maintenance function and method for the optical fiber network deployed in the field are very important. [Maintenance here means any means that can guarantee the performance of the ODN (Optical Distribution Network).
[18] The present invention relates to a product used for maintenance and monitoring in a passive light distribution network by integrating a thin film filter and a waveguide and maximizing the efficiency of a package to reduce the cost.
[19] First, let's first look at the network structure to which the device to be used in the present invention is applied. The optical network monitoring technology based on the Optical Time Domain Reflectometer (OTDR) (1) is the basis for the automatic sensing system in consideration of the maintenance of the optical network deployed in the PON. This is illustrated well in FIG.
[20] Until now, the OTDR-based surveillance system has been developed and used mainly for monitoring transmission intervals having a point-to-point structure. However, because PON has a point-to-multipoint architecture, it is not easy to monitor all branch fiber optics at once with a single OTDR in the traditional way. This is because the reflections of the backscattered light coming back from the end of the individual branch fiber can overlap each other. Overcoming these challenges, a method for monitoring the optical network of the PON with OTDR is being attempted.
[21] This automatic monitoring system is very useful for preventive maintenance and post-fault maintenance. The system not only identifies the fault immediately, ie whether it is a fiber failure or equipment failure, but also quickly identifies the failure point in the event of a fiber failure. This will eventually reduce service downtime and increase network reliability.
[22] 1 shows a passive optical network structure having a general optical surveillance network. Representative method is that the monitoring light proceeds through all branch fiber cores in order. This method will be described by way of example. As shown in FIG. 1, the signal light from the OT 2, which is a signal light, and the monitoring light of the OTDR 1 are combined by a WDM combiner 3a connecting the signal light and the monitoring light and monitored again before entering the distributor 4. The light is separated by a WDM combiner 3b that separates the signal light. The signal light of the OT is distributed to the respective optical subordinates (ONU) 5 through a divider. At this time, the monitoring light separated by the WDM combiner 3b is again connected to the optical path separated by the WDM combiner 3c ', and the monitoring light connected again by the WDM combiner 3d is returned to the splitter again and the WDM combiner again. Coupled by (3c '') and repeats this process to monitor the beam.
[23] In general, passive optical surveillance uses this method, and attempting to construct this room by a combination of existing parts requires a cost of optical fiber and WDM coupler (3) because it requires a return path from each ONU to the splitter. . 2A is an internal wiring diagram of a generally manufactured module. The WDM combiner 3 and the distributor 4 are continuously connected to this module, which is bulky and very expensive. Figure 2b is the internal wiring of the module actually fabricated in this way. As shown in the figure, several components are complicatedly connected, and the optical splitter 4, the many WDM combiners 3, and the optical fiber protective support 6 connecting the components are complicated.
[24] The present invention is a device fabricated using the technology and fabricated by integrating such a number of parts on one chip in order to solve such a complex, bulky and expensive consumption disadvantage.
[25] As described above, the WDM coupler (3), such as the WDM coupler (3) is very large when monitoring with the existing components. In addition, the size of the components becomes very large while all are connected, and the optical connection loss increases as the connection continues. The present invention is a technology for manufacturing each of these components on a single chip and a device using the same. Accordingly, by applying the present invention it is possible to manufacture a module that performs the same function in a very small volume is very economical.
[26] The device according to the present invention is a technology for producing the advantage that the size of the hybridization is small, and there is little change in the optical properties according to the temperature without changing the existing component characteristics, the components manufactured by the present invention is low cost, high Its purpose is to make the integrated parts easily by using the reflecting film and combine it with the optical splitter and the high reflecting filter, and to mass production at low cost.
[1] 1 is a passive optical network structure having a general optical surveillance network
[2] Figures 2a and 2b is an internal wiring diagram of a module made of the existing components used in the optical surveillance network
[3] 3a and 3b are conventional parts used in the optical surveillance network
[4] Figure 4a and 4b is an optical surveillance network composed of an optical waveguide splitter having a wavelength division function of the signal light and monitoring light of the present invention
[5] 5 is a method of manufacturing an optical waveguide splitter having a wavelength division function of signal light and monitoring light;
[6] 6a and 6b is a conventional module and the present invention module
[7] * Explanation of symbols for main parts of the drawings
[8] 1: Monitoring light (OTDR) 2: Signal light
[9] 3: WDM coupler type 4: distributor
[10] 5: ONU subscriber unit 6: fiber protection support
[11] 7: filter insert groove 8: ultra-thin filter
[12] 9: refractive index matching epoxy 10 collimator
[13] 11: general thin film filter
[27] In the optical splitter used in the conventional optical communication passive component network, the components shown in FIG. 3 may be used. 3A shows a model of a general distributor. 3B works to separate the signal light and the monitoring light. The device used here uses a collimator 10 product that collects light, which serves to collect light and make the loss small. The reason for using this is that the thickness of the general thin film filter 11 is large, and if the collimator 10 is not used, a large loss occurs. In addition, this method is very bulky and difficult to integrate. This is also a result due to the large thickness of the general thin film filter 11.
[28] In order to overcome the above problems and achieve the object of the same characteristics, the present invention provides a planar waveguide by forming an ultra-thin filter that can exhibit the same effect without the collimator 10 due to the deformation of the ultra-thin filter 8 and the waveguide. It can be mass-produced by the process and reduces the package size, and has the advantages as a package form that can be easily produced.
[29] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
[30] As shown in FIG. 4A, the recess 7 is recessed in the distribution point on the planar waveguide on which the optical distributor 4 is formed, and the ultra-thin filter 8 manufactured above is inserted at the position. The effect is separable. The signal light is emitted to the output stage and the other signal is returned to the input stage side. At this time, if the incident axis of the incident light is adjusted, the optical signal is output to the other port of the incident axis. The filter insertion region of FIG. 4A is enlarged, as shown in FIG. 4B. Signal light passes from port 1 to port 3 and supervisory light goes from port 2 to port 3.
[31] 5 shows a manufacturing method of the present invention. A waveguide is fabricated using a semiconductor process. First, when the core is formed, the groove 7 is formed in the portion where the filter is inserted through the semiconductor process, and the formed window is etched with etching equipment to penetrate the waveguide. After that, the ultra thin filter 8 is inserted and the ultra thin filter 8 is fixed with the refractive index matching epoxy 9.
[32] As described above, the present invention is manufactured in the form of taking advantage of the waveguide type and the thin film interference type, and in particular, by removing the collimator used in manufacturing using a general filter and adding a low cost low loss thin film interference filter instead. By using it, the strength of packaging is improved and the price is lowered.
[33] In addition, mass production is possible when the manufacturing process is optimized, thereby lowering the cost of parts. The use of an ultra-thin filter eliminates the need for a collimator that collects the filter and the light. In this case, the isolation characteristics, which represent the degree of noise that each wavelength affects each other's signals, are very good, and the packaging is simple, allowing mass production.
[34] Figure 6 is a view showing the effect of the present invention Figure 6a is a shape of the module produced by the conventional method, Figure 6b is a shape of the module manufactured in an integrated form according to the present invention.

权利要求:
Claims (1)
[1" claim-type="Currently amended] In the splitter, which is a splitter element used in optical systems such as passive optical communication networks, the signal and monitoring light wavelengths are selectively selected in the waveguide by having a characteristic that separates the signal and monitoring light into a waveguide formed to insert an ultra-thin filter. A planar waveguide splitter characterized in that it is integrated with one having a function to separate.

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同族专利:

公开号 | 公开日

引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

法律状态:
2003-02-06|Application filed by 주식회사 와이티테크놀로지

2003-02-06|Priority to KR1020030007313A

2003-03-12|Publication of KR20030021199A

优先权:

申请号 | 申请日 | 专利标题

KR1020030007313A|KR20030021199A|2003-02-06|2003-02-06|The planer lightwave circuit type splitter for monitor and signal wavelength division coupler|

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