• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    The general field of the invention is that of photonic generation devices of arbitrary linear frequency modulated arbitrary microwave signals comprising a laser (1), a set (2) for shaping the emitted signal and a photoreceptor (3) whose band passing is in the field of microwave frequencies. The shaping assembly comprises: a first optical separator (20); A first optical channel comprising a frequency shift loop comprising an optical splitter (50), a first optical amplifier (60), an optical isolator (70), a first spectral optical filter (75) and an acousto shifter (80); -optic of frequencies; A second optical channel comprising an electro-optical frequency shifter (30); A second optical separator (40); A second optical amplifier (90); A second optical filter (100); the acousto-optical offset frequency, the electro-optical offset frequency and the amplification gain of the first optical amplifier being adjustable.
    公开号:FR3043216A1
    申请号:FR1560294
    申请日:2015-10-28
    公开日:2017-05-05
    发明作者:De Chatellus Hugues Guillet；Jose Azana
    申请人:Inst Nat de la Rech Scient；Institut National de La Recherche Scientifique INRS；Centre National de la Recherche Scientifique CNRS；Universite Joseph Fourier (Grenoble 1)；
    IPC主号:
    专利说明:

    Device for photonic generation of microwave signals with arbitrary linear frequency modulation
    The field of the invention is that of the photonic generation of microwave signals and more specifically of microwave signals with linear frequency modulation, also called "MLF". These MLF signals are also called "arbitrary". In the remainder of the text, the term "MLF" refers to the temporal form of the signal. These signals are also known by the Anglo-Saxon term "chirp". These signals are characterized by their central or average frequency, sometimes referred to as the carrier frequency and their bandwidth. This is defined conventionally by the difference between the highest frequency and the lowest frequency of the signal. In this case, the carrier frequency is between 1 GHz and 100 GHz and the bandwidth between 0 and 200 GHz.
    The fields of application of this type of microwave signals are numerous and diverse. Examples include the fields of radar, biomedical imaging, health, spectroscopy, and characterization of radiofrequency components.
    The pulse compression radars allow to obtain a very good spatial resolution, shorter than the length corresponding to the duration of the pulse. This avoids the disadvantages associated with the generation, amplification and emission of short and intense pulses. The signals emitted by these pulse compression radars are microwave signals with linear frequency modulation. It is the same radars known by the acronym "FMCW", meaning "Frequency Modulation Continuous Wave". This type of radar can in particular be used in the field of health to perform contactless monitoring of physiological parameters such as heart rate.
    In biomedical imaging, microwave signals with linear frequency modulation provide access to the properties of biological tissues by measuring their dielectric permittivity. In addition, it is possible to work on low energy signals.
    These signals are also particularly well suited to the spectroscopy of gaseous macromolecules such as amino acids or peptide chains.
    Finally, these signals can be used for the characterization of radiofrequency components of all types. Current equipment of the "SNA" type, an acronym for "Scalar Network Analyzer" or of the "VNA" type, an acronym for "Vector Network Analyzer" that perform this type of characterization are generally heavy and expensive equipment.
    Traditionally, arbitrary signals are created from arbitrary function generators, known by the acronym "AWG", meaning "Arbitrary Waveform Generator". However, their bandwidth is limited by digital analog converters at 40-100GHz. In addition, the use of AWGs is limited by their cost, the fluctuation of the time of emission of signals or "jitter" temporal, the congestion and the electrical consumption of the apparatuses.
    More specifically, the generation of arbitrary signals is implemented by a simple "VCO", an acronym for "Voltage Controlled Oscillator" which generates a frequency signal proportional to the input voltage. The main drawback of this technique is that the bandwidths obtained are limited to a few GHz. Moreover, this type of generator can be parasitized by other microwave sources.
    To overcome the intrinsic limitations of the bandwidth of electronic systems due to the speed of analog-to-digital converters, a new field of research, called microwave photonics, also called "microwave photonics" has developed over the past ten years . Reference is made to the article by J. Yao entitled "Microwave photonics", J. Lightwave Tech. (2009) for further information on this technique. The principle is to use the very important bandwidth of fibered optical systems which can be greater than 10 THz, then to postpone this bandwidth in the microwave frequency range. To give a simple example, the beating of two fiber lasers on a photodetector produces a microwave signal whose frequency is equal to the difference of the optical frequencies of the two lasers. This gives a signal in the GHz-THz range. Moreover, the optical techniques are insensitive to electromagnetic interference, have a low power consumption and a small footprint. Finally, the spectral purity of the optical pulse trains generally linked to the mechanical stability of the laser cavities makes it possible to obtain a temporal jitter less than that of the electronic methods.
    To generate MLF signals at frequencies above GHz, several photonic solutions have been proposed.
    The first solution is the use of the technique known as "FTTM", an acronym meaning "Frequency To Time Mapping" in dispersive optical lines. A picosecond or femtosecond mode-locked laser generates a short pulse with wide optical spectrum. A frequency filter prints a modulation of the chirp signal spectrum. The left part of FIG. 1 represents the amplitude A of this pulse as a function of time t and as a function of frequency f. This pulse is sent in a dispersive line called GVD, acronym for "Group Velocity Dispersion". At the output of the dispersive line, the temporal shape of the pulse reproduces the spectral shape of the pulse as seen on the right-hand part of FIG. 1. An MLF or chirp signal has thus been generated. Alternatively, this type of optical signal can be made from an incoherent source. This solution suffers from a certain complexity.
    A variant of this first technical solution consists in modulating the spectrum by a cosine function and then propagating it in a medium whose dispersion is non-linear. This medium may be a Bragg grating "chirped" non-linearly. This technique has several limitations. Large bandwidths can not be achieved, nor can the signal duration simply be changed or frequency variations increasing over time.
    A second variant consists in modulating the optical spectrum in a dispersive interferometer. The previously stretched laser pulse is injected into an interferometer in which the two arms have different group velocity dispersions. At the output, the spectrum has splines whose spacing varies linearly, which is reflected in the time domain by a linear modulation of the frequency of the light intensity of the pulse. This technique has some advantages over previous solutions. However, the system still requires a locked mode laser and the duration of the MLF is not simply adjustable.
    In a third variant, the pulse resulting from the laser is modulated not only in amplitude, but also in phase. This last technique makes it possible to obtain large bandwidths but always has significant disadvantages. The repetition rate remains limited, the duration as well as the direction of the frequency variation are not adjustable. The means to implement, in particular the femtosecond laser and the modulator remain complex and expensive.
    A second technical solution for generating MLF microwave signals is to use two lasers. In a first configuration, the first laser emits a continuous, single-frequency signal and the second laser pulse has undergone an MLF. The beat of these two lasers on a photodetector reproduces the optical MLF in the field of microwaves. The advantages of this technique are relative simplicity and the ability to adjust the duration of the signal, the range of variation of its central frequency and its bandwidth. In return, the linearity of the MLF of the laser is problematic for large bandwidths.
    A variant of this second solution is to propagate a short pulse emitted by the first laser in a dispersive medium so as to disperse the frequencies contained in the pulse. The scattered pulse is then recombined with the second laser. This technique gives interesting performance at the cost of higher technical complexity, significant cost and less flexibility. A variant of this technique is to beat two lasers that have undergone two different dispersive propagation and therefore two different optical chirps.
    However, despite their flexibility, because of the lack of possible stabilization of frequencies and even more of phase between the two lasers, the techniques using two lasers are unacceptable for applications where a high reproducibility of the signal is necessary and in particular for radar applications where pulse-to-pulse coherence is needed.
    More precisely, the subject of the invention is a device for photonic generation of arbitrary microwave signals modulated linearly in frequency, said device comprising, in this order, a laser emitting a continuous signal at a first optical frequency, a set of spectral shaping and temporal of said continuous signal and a photoreceptor whose bandwidth is in the range of microwave frequencies, characterized in that the set of spectral and temporal shaping comprises at least: A first optical separator Y arranged at the output of the laser; A first optical channel disposed at the output of the first branch of the first optical Y-splitter, said first optical channel being a frequency shift loop, said frequency-shift loop comprising an optical X-splitter, a first optical amplifier, a first optical filter, an optical isolator and an acousto-optical frequency shifter arranged between two branches of the optical X-splitter; A second optical channel arranged at the output of the second branch of the first optical splitter Y, said second optical channel comprising an electro-optical frequency shifter; A second Y-shaped optical splitter whose first branch is arranged at the output of the first optical channel and the second branch at the output of the second optical channel; A second optical amplifier arranged at the common output of the second optical Y splitter; A second optical filter disposed between the output of the second optical amplifier and the photoreceptor;
    At least the acousto-optical offset frequency, the electro-optical offset frequency and the amplification gain of the first optical amplifier being adjustable.
    Advantageously, all or part of the device is fiber-bundled, the laser being fiber-reinforced, the first Y-shaped optical splitter being a first Y-shaped optical coupler, the second Y-shaped optical splitter being a second Y-shaped optical coupler and the X-shaped optical splitter being a optical coupler in X.
    Advantageously, all or part of the device is made of integrated optics.
    Advantageously, all or part of the device is produced by means of discrete optical components, the first Y-shaped optical splitter being a first splitter cube comprising a semi-reflective plate, the second Y-shaped optical splitter being a second splitter cube comprising a semi-reflective plate. reflective and X optical separator being a separator cube having a semi-reflective blade.
    Advantageously, the first optical filter of the optical band-pass type.
    Advantageously, the second optical filter is an optical band-pass spectral filter or an intensity modulation filter.
    Advantageously, the product of the acousto-optical shift frequency by the travel time by the light of the frequency shift loop is substantially equal to an integer or to a fractional number.
    Advantageously, the acousto-optical offset frequency is between 1 and 300 MHz.
    Advantageously, the electro-optical frequency shifter is a single sideband modulator.
    Advantageously, the electro-optical offset frequency is between -40 GHz and +40 GHz.
    Advantageously, the gain of the first amplifier is at least sufficient to compensate for the optical losses in the X optical separator, the optical isolator, the acousto-optical frequency shifter and the spectral optical filter. The invention will be better understood and other advantages will become apparent on reading the description which follows given by way of non-limiting example and by virtue of the appended figures among which:
    Figure 1 already commented is the illustration of the technique known as "FTTM", acronym meaning "Frequency To Time Mapping" generation of microwave signals with linear frequency modulation in dispersive lines according to the prior art;
    FIG. 2 represents a general block diagram of a device for photonic generation of linear frequency modulated arbitrary microwave signals according to the invention including a frequency shift loop;
    FIG. 3 represents the initial signal as a function of frequency in a device according to the invention;
    FIG. 4 represents a first signal as a function of the frequency at the output of the frequency shift loop in a device according to the invention;
    FIG. 5 represents a second signal as a function of the frequency at the output of the frequency shift loop in a device according to the invention;
    FIG. 6 represents the signal as a function of the frequency at the output of the electro-optical frequency shifter in a device according to the invention;
    FIG. 7 represents the transmission curve of the first optical filter as a function of frequency in a device according to the invention;
    FIG. 8 represents the periodic signal as a function of time at the output of the photoreceptor in a device according to the invention, in the case where the ratio fs / fc is close to an integer ratio;
    Figures 9 and 10 show the signal as a function of time and as a function of the frequency offset in a device according to the invention.
    The device for photonic generation of microwave signals according to the invention can be realized either in a "fibered" configuration or integrated optics, the frequency shift loop being constituted by optical fibers or waveguides; in a "free space" configuration with discrete optical components, the frequency shift loop being performed by properly aligned mirrors. Free space configuration means a configuration in which the optical beams propagate all or part of the free space.
    The block diagram of a device for photonic generation of arbitrary microwave signals linearly modulated in frequency according to the invention is represented in FIG. 2 in its "fiberized" version. This version is detailed below. However, whenever there is a significant difference between the fiber version and the free space version, it is reported.
    The photonic generation device of FIG. 2 comprises in this order: a laser emitting a continuous signal S0 at a first optical frequency denoted f0. This frequency is in the range of a few hundred THz. This laser may advantageously be a fiber laser emitting in the range of frequencies called "telecom", around 1550 nm. It must have a small linewidth of the order of a few kHz and emit a power of a few mW. Other wavelengths are possible, in particular around 780 nm or 1 μm but the fiber components for these wavelengths are more expensive. The amplitude A of this signal S0 as a function of the frequency f is shown in FIG. 3. The use of a single laser has a great advantage over the preceding technologies insofar as pulse-to-pulse coherence is automatically insured; a set 2 of spectral and temporal shaping of said continuous signal; a photoreceptor 3 whose bandwidth is in the range of microwave frequencies. The spectral and temporal shaping assembly 2 comprises at least: a first optical separator device 20 in Y. In the case of FIG. 2, this separator is an optical coupler. In an embodiment in free space, this coupler is a separator blade or a separator cube. This separator comprises an input 21 and two output branches 22 and 23. The input 21 is coupled to the laser 1, the output 22 is coupled to the first optical channel and the output 23 to the second optical channel; A first optical channel arranged at the output of the first branch 22 of the first coupler 20. This first optical channel is a frequency offset loop. It comprises an optical splitter device 50 in X, a first optical amplifier 60, an optical isolator 70, a first optical spectral filter 75 and an acousto-optical shifter of frequencies 80. The optical splitter 50 in X can be a fiber coupler Four-way optical optics or optical separator made by means of a semi-reflective plate. The coupler 50 in X comprises two input channels 51 and 52 and two output channels 53 and 54. The input 51 is coupled to the output 22 of the coupler Y. The amplifier 60, the insulator 70, the filter spectral 75 and the acousto-optic shifter 80 are connected in series between the output 54 and the input 52 of the coupler X. The amplifier 60 has a gain denoted G, all the optical losses in the first channel due to different optical couplings and losses in the isolator and the acousto-optical shifter 80 is noted P. o The role of the optical isolator 70 is to force the light from the laser to propagate in a single direction, thus avoiding waves parasites move in the opposite direction and disrupt the operation of the system. The first objective of the optical spectral filter 75 is to limit the noise due to the amplified spontaneous emission and, incidentally, to be able to select the bandwidth of the loop and thus to control the spectral width of the frequency-modulated signal. This programmable optical filter is based on a Bragg grating photo-inscribed in an optical fiber, or on a diffractive element or optical grating for accessing the spectrum of light in the Fourier plane of the device. A programmable amplitude filter, usually a liquid crystal matrix, placed in this Fourier plane, makes it possible to selectively attenuate the different frequencies of the light and thus to modulate its spectrum. A second passage in the network recollimates the light after modulation of its spectrum, and reinject it either in the loop in free space, or in an optical fiber in the case of a fiber configuration. o The acousto-optical shifter 80 uses the diffraction of the light wave by a progressive acoustic wave in a transparent solid. The acousto-optical offset frequency fs is between 1 and 300 MHz. This frequency range is quite conventional for this type of device. o The inverse of the travel time in the frequency shift loop is called fc. In the case of a fibered configuration, if the length of the frequency shift loop is 10 meters, the frequency fc of this loop is 30 MHz. This frequency is 10 MHz for a loop length of 30 meters. The order of magnitude of this frequency is equivalent to that of the acousto-optical offset frequency fs. These orders of magnitude of loop length are naturally those obtained using erbium doped fiber amplifiers 60. In the case of a configuration in free space, the length of the loop can be significantly lower, by a few tens of centimeters to a few meters. The values of fc are then higher and vary between 100 MHz and 1 GHz. A second optical channel is disposed at the output of the second branch 23 of the first separator device Y. This second optical channel comprises an electro-optical frequency shifter 30. This frequency shifter is preferably a single sideband modulator. This shifter usually uses two Mach-Zehnder interferometers each containing an electro-optical modulator. By correctly adjusting the voltages of the electro-optical modulators so as to destructively interfere with both the carrier and one of the two sidebands, a single sideband is obtained at the output: this device therefore functions as a frequency shifter. The electro-optical offset frequency fe is between -40 GHz and +40 GHz in a fiber configuration. This frequency range is quite conventional for this type of device. - A second optical separator device 40 Y. This separator comprises two input branches 42 and 43 and a single output 41. Again, this separator may be a fiber optic coupler or a semi-reflective blade. The first input branch 42 is coupled to the output 53 of the X-coupler of the first channel, the second output input branch 43 is coupled to the output of the electro-optical frequency shifter 30; A second optical amplifier 90 disposed at the common output 41 of the second optical splitter Y. A second optical filter 100 disposed between the output of the second optical amplifier 90 and the photoreceptor 3. This filter may be a programmable filter which operates on the same principle as the spectral filter 75. Of course, the filter band of the optical filter must be compatible with the optical frequency f0. Alternatively, because of the linear relationship between time and instantaneous frequency in the case of linear frequency modulated signals, this filter can also be an intensity modulator, which makes it possible to control temporally the intensity of the light signal at the exit from the loop. In general, this intensity modulator is based either on an acousto-optic modulator or on electro-optical modulation. The latter can itself be based on polarization rotation by Pockels effect, or on an interference effect in a Mach-Zehnder interferometer.
    At least the acousto-optical offset frequency fs, the electro-optical offset frequency f e and the gain gain G of the first optical amplifier are adjustable. The frequency fs is adjusted, for example, by means of a radio frequency generator.
    The operation of the photonic generation device is detailed below.
    A first portion of the beam emitted at the frequency f0 is introduced into the frequency shift loop. Its operation is as follows. Whenever the beam makes a complete revolution of the loop and returns to the input 52 of the X-coupler, a portion of the beam is fed back into the loop by the X coupler, the second part exits the loop and passes through the loop. Thus, at the output 53 of the X-coupler, an optical signal Si composed of a succession of optical signals S-1 k having passed a certain number of times through the loop is obtained.
    Each S-ik signal is characterized by its amplitude, frequency and phase. Figures 4 and 5 show the amplitudes of the succession of signals S-ik as a function of frequency. The amplitude of the Sik signal depends on the gain of the optical amplifier 60, the first optical filter 75 and losses in the loop. If the gain just compensates for the losses, all the Sik signals have the same amplitude as seen in FIG. 4. If the gain is less than the losses, the amplitude of the Sik signals goes off rapidly as can be seen in FIG. .
    Whenever the light passes through the acousto-optic frequency shifter 80, its frequency is increased by an amount fs. Thus, the signal S-ik has a frequency equal to f0 + k.fs as seen in FIGS. 4 and 5.
    Given the iterative effect in the loop, it is shown that the different frequencies have a quadratic dependence of their phase. More precisely, the phase cp1k of the signal Sik of frequency f0 + k.fs satisfies the relation: (pik = n.k. (k + 1) .fs / fc
    Reference is made to the articles by H. Guillet de Chatellus et al, entitled "Generation of ultrahigh and repeatable rates in CW injection seeded frequency shifted feedback lasers", Opt. Exp. 21, 15065 (2013) and "Theory of Talbot lasers", Phys. Rev A 88, 033828 (2013) for all information on this calculation.
    The optical signal Si is therefore equivalent to an optical frequency comb having undergone a certain dispersion of group velocity corresponding to the quadratic spectral phase.
    In the time domain, this optical signal consists of a train of light pulses, identical and of period 1 / fs. Each pulse has an MLF in the optical frequency domain whose minimum and maximum frequencies are f0 and f0 + K.fs. where K is the maximum number of round trips made by the light in the loop, and equivalently, the number of frequencies present in the optical frequency comb at the exit of the loop.
    Moreover, the equivalent dispersion is proportional to the curvature of the parabola of the phases, that is to say fs / fc. This latter parameter is easily controllable by adjusting the offset frequency aeousto-optic fs. As we see in the expression of the phase tp1k, it is interesting to choose the ratio fs / fc close enough to an integer value, or a ratio of two integers p / q where q is smaller than K.
    When this ratio is exactly equal to an integer value, the equivalent dispersion is zero. All the spectral components are in phase and the loop emits short pulses, the time limit being given by the Fourier transform of the frequency comb. In the case where this ratio is equal to a ratio of integers p / q, with q <K, the loop emits short pulses of the same duration as in the case of the whole report but at a repetition rate or number of pulses per second equal to q * fs.
    The description and explanation of this effect are given in the two articles cited above.
    On the other hand, when this ratio deviates from the integer or fractional value, the optical pulse widens temporally and presents an MLF whose direction of variation changes with the passage of the integer. Indeed, it is known that phase shifts in the spectral domain correspond to time offsets in the time domain. At a great diversity of phases in the spectral domain, therefore corresponds a temporal widening of the resulting pulse.
    A second portion of the beam emitted at the frequency f0 is introduced into the electro-optical frequency shifter. At the output of the frequency shifter 30, an optical signal S2 is obtained whose frequency is equal to f0 + fe. The amplitude of this signal S2 as a function of the frequency is represented in FIG. 6. The Y coupler 40 receives on these two inputs 42 and 43 the signals S1 and S2 coming respectively from the frequency shift loop and the electro-shifter. -optic and recombine them. This recombined signal therefore comprises an optical frequency centered on f0 + fe and a comb of optical frequencies ranging from f0 to f0 + K.fs.
    The recombined signal is amplified by the optical amplifier 90, filtered by the filter 100 and received by the photodetector 3. This latter amplified and filtered optical signal S3 is noted. FIG. 7 represents the bandwidth BP of the programmable filter 100, induced either by a spectral filtering or by a temporal modulation of the signal at the output of the loop, depending on the solution chosen. It is also possible to replace the spectral filter 100 with an intensity modulator. Indeed, because of the linear relationship between the frequency and the time, a temporal modulation of the intensity of the pulse, synchronized with the pulse train is equivalent to a spectral filtering by the filter 100. Even if it is more complex to implement insofar as it requires a very precise synchronization of the modulation signal with the pulse train, the temporal modulation of the intensity makes it possible to overcome a limitation of the spectral filter, which is posed by its resolution, greater than 10 GHz, for commercial devices of the "waveshaper" type.
    The electrical signal SE at the output of the photodetector 3 consists of a periodic train of signals SEi. Its time period is equal to 1 / fs when the ratio fs / fc is an integer or 1 / (qfs) when this ratio is equal to p / q, p and q being integers and q being less than K. This train is shown in Figure 8 in the case of the whole report. In this case, the signals Se1 are then identical. Each signal has an instantaneous frequency which varies over time as can be seen in FIG. 8. It should be noted that, in this figure and the two following ones, the signal includes, for the sake of clarity, a reduced number of periods . Actual signals usually have a much larger number of periods.
    The signal bandwidth is given by the spectral width of the optical signal S3. It is limited by the bandwidth of the filter 100 and by the spectral width of the signal Si flowing in the frequency shift loop. As has been said, this is related to the gain of the optical amplifier 60, the spectral optical filter 75 and the losses in the loop. The central frequency is related to the optical frequency f0 + fe of the signal S2. It is thus possible to reach microwave frequencies in the 100 GHz range.
    It is also possible to modify the direction of variation of the MLF by modifying the frequency fs. It is known that the direction of variation of the MLF changes when the ratio fs / fc changes to the passage of an integer or a ratio of integers. Figures 9 and 10 illustrate this property. They represent the amplitude A of the elementary signal SEi as a function of time.
    If a is an integer or a ratio of integers p / q (q <N), we then call ε the difference between the value of a and the integer or the nearest integer ratio.
    When ε is zero, the output signal consists of pulses limited by Fourier transform, there is no more MLF.
    When ε is not zero, we can show that the duration of the signal at MLF is approximately of the order of s * K / fs where K is the total number of frequencies in the frequency comb at the output of the loop. Thus, when ε = +/- 1 / K, the duration of the signal at MLF is 1 / fs. Therefore, the interesting range of variation of ε is between -1 / K and + 1 / K.
    When the ratio fs / fc is slightly lower than a, that is to say when ε is negative, the MLF of the elementary signal SEi starts temporally by the low frequencies and ends with the high frequencies and when the ratio fs / fc is slightly greater than a, ie when ε is positive, the MLF of the elementary signal Se1 begins temporally with the high frequencies and ends with the low frequencies. By way of example, for a signal 12 of period 12 ns comprising frequencies in a range between 0 and 30 GHz, a frequency variation fs of only 80 kHz is sufficient to modify the direction of the modulation.
    权利要求:
    Claims (11)
    [1" id="c-fr-0001]
    1. Device for photonic generation of arbitrary microwave signals linearly modulated in frequency, said device comprising, in this order, a laser (1) emitting a continuous signal at a first optical frequency, a set (2) of spectral and temporal shaping said continuous signal and a photoreceptor (3) whose bandwidth is in the range of microwave frequencies, characterized in that the spectral and temporal shaping assembly comprises at least: -A first optical splitter (20) Y arranged at the exit of the laser; A first optical channel arranged at the output (22) of the first branch of the first optical Y splitter, said first optical channel being a frequency shift loop, said frequency shift loop comprising an optical splitter (50) in X a first optical amplifier (60), a first optical filter (75), an optical isolator (70) and an acousto-optical frequency shifter (80) arranged between two branches of the X optical splitter; A second optical channel arranged at the output (23) of the second branch of the first optical splitter Y, said second optical channel comprising an electro-optical frequency shifter (30); A second optical splitter (40) in Y whose first branch (42) is arranged at the output of the first optical channel and the second branch (43) at the output of the second optical channel; A second optical amplifier (90) disposed at the common output (41) of the second optical Y splitter; A second optical filter (100) disposed between the output of the second optical amplifier and the photoreceptor; At least the acousto-optical offset frequency, the electro-optical offset frequency and the amplification gain of the first optical amplifier being adjustable.
    [2" id="c-fr-0002]
    2. Device for photonic generation of arbitrary microwave signals according to claim 1, characterized in that all or part of the device is fiber-reinforced, the laser being fiber-reinforced, the first optical splitter Y being a first optical coupler Y, the second optical splitter Y is a second Y-shaped optical coupler and the X-shaped optical splitter is an X-shaped optical coupler.
    [3" id="c-fr-0003]
    3. Device for photonic generation of arbitrary microwave signals according to claim 1, characterized in that all or part of the device is made of integrated optics.
    [4" id="c-fr-0004]
    4. Device for photonic generation of arbitrary microwave signals according to claim 1, characterized in that all or part of the device is produced by means of discrete optical components, the first optical splitter Y being a first splitter cube comprising a semi-reflective blade the second Y-shaped optical splitter being a second splitter cube having a semi-reflective plate and the X-shaped optical splitter being a splitter cube having a semi-reflective plate.
    [5" id="c-fr-0005]
    5. Device for photonic generation of arbitrary microwave signals according to one of the preceding claims, characterized in that the first optical filter (75) is of the optical band-pass type.
    [6" id="c-fr-0006]
    6. A device for photonic generation of arbitrary microwave signals according to one of the preceding claims, characterized in that the second optical filter (100) is either an optical band-pass spectral filter or an intensity modulation filter.
    [7" id="c-fr-0007]
    7. A device for photonic generation of arbitrary microwave signals according to one of the preceding claims, characterized in that the product of the acousto-optical shift frequency by the travel time of the light of the frequency shift loop is substantially equal. to a whole number or to a fractional number.
    [8" id="c-fr-0008]
    8. A device for photonic generation of arbitrary microwave signals according to one of the preceding claims, characterized in that the acousto-optical shift frequency is between 1 and 300 MHz.
    [9" id="c-fr-0009]
    9. A device for photonic generation of arbitrary microwave signals according to one of the preceding claims, characterized in that the electro-optical frequency shifter is a single sideband modulator.
    [10" id="c-fr-0010]
    10. A device for photonic generation of arbitrary microwave signals according to one of the preceding claims, characterized in that the electro-optical offset frequency is between -40 GHz and +40 GHz.
    [11" id="c-fr-0011]
    11. A device for photonic generation of arbitrary microwave signals according to one of the preceding claims, characterized in that the gain of the first amplifier is at least sufficient to compensate for the optical losses in the X optical separator, the optical isolator, the acousto-shifter. -optic of frequencies.
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    同族专利:
    公开号 | 公开日
    JP6808727B2|2021-01-06|
    US10234706B2|2019-03-19|
    US20180284495A1|2018-10-04|
    CN108432127B|2022-01-28|
    CN108432127A|2018-08-21|
    EP3369172A1|2018-09-05|
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    FR3043216B1|2018-02-02|
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    法律状态:
    2016-09-21| PLFP| Fee payment|Year of fee payment: 2 |
    2017-05-05| PLSC| Publication of the preliminary search report|Effective date: 20170505 |
    2017-10-31| PLFP| Fee payment|Year of fee payment: 3 |
    2018-10-30| PLFP| Fee payment|Year of fee payment: 4 |
    2019-10-31| PLFP| Fee payment|Year of fee payment: 5 |
    2020-10-30| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1560294A|FR3043216B1|2015-10-28|2015-10-28|PHOTONIC GENERATION DEVICE FOR ARBITRATIC FREQUENCY LINEAR MODULATION MICROWAVE SIGNALS|
    FR1560294|2015-10-28|FR1560294A| FR3043216B1|2015-10-28|2015-10-28|PHOTONIC GENERATION DEVICE FOR ARBITRATIC FREQUENCY LINEAR MODULATION MICROWAVE SIGNALS|
    US15/768,820| US10234706B2|2015-10-28|2016-10-20|Device for photonic generation of arbitrary microwave signals having linear frequency modulation|
    CN201680062749.6A| CN108432127B|2015-10-28|2016-10-20|Photon generating device for any microwave signal through linear frequency modulation|
    EP16787387.6A| EP3369172B1|2015-10-28|2016-10-20|Device for photonic generation of arbitrary microwave signals having linear frequency modulation|
    JP2018515940A| JP6808727B2|2015-10-28|2016-10-20|Device for light generation of arbitrary microwave signals with linear frequency modulation|
    CA3002597A| CA3002597A1|2015-10-28|2016-10-20|Device for photonic generation of arbitrary microwave signals having linear frequency modulation|
    PCT/EP2016/075249| WO2017072025A1|2015-10-28|2016-10-20|Device for photonic generation of arbitrary microwave signals having linear frequency modulation|
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