CN111092659B - Double-chirp signal generation system based on stimulated Brillouin scattering - Google Patents
Double-chirp signal generation system based on stimulated Brillouin scattering Download PDFInfo
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- H04B10/25137—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using pulse shaping at the transmitter, e.g. pre-chirping or dispersion supported transmission [DST]
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- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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Abstract
The invention belongs to the technical field of photoelectricity, and relates to a double-chirp signal generation system based on stimulated Brillouin scattering. The tunable double-pump light generation is realized by inhibiting the carrier double-sideband modulation by using only one direct-current laser source, the frequency sweep light carrier is realized by inhibiting the carrier single-sideband modulation, the conversion of the frequency sweep light carrier from phase modulation to intensity modulation is realized by utilizing the stimulated Brillouin scattering effect of the pump light in a Brillouin gain medium, and the double-chirp signal generation is realized by utilizing a Fourier domain mode-locked photoelectric oscillator mechanism. The double chirp signal generated by the system has low phase noise, good linearity and long-time stability, and flexible tuning of the central frequency and bandwidth of the signal.
Description
Technical Field
The invention relates to the technical field of photoelectricity, in particular to a double-chirp signal generation system based on stimulated Brillouin scattering.
Background
The linear frequency modulation signal is widely applied to a modern pulse compression radar system, and the distance resolution of the radar system can be improved by the broadband linear frequency modulation signal with a large time bandwidth product. However, the chirp signal has a knife-edge type fuzzy function, that is, when a moving object is detected by using the chirp signal, a large range-doppler coupling is introduced, and the range-doppler accuracy is reduced, thereby causing a fuzzy judgment of the target range. By transmitting a double chirp signal, i.e., a pair of chirped complementary chirp signals within the same signal period, the range-doppler coupling effect can be significantly eliminated.
The traditional double-chirp signal is generated by a direct digital frequency synthesizer and is limited by the performance of electronic devices, the signal bandwidth is only a few GHz usually, and the signal frequency band is low, while the double-chirp signal generation with large bandwidth and frequency agility can be realized by utilizing the microwave photon technology. In recent years, many double-chirp signal generation schemes are based on high-performance electro-optical modulators, and utilize a microwave photonic link to up-convert and frequency-multiply a baseband chirp signal, thereby further realizing the generation of a high-frequency broadband double-chirp signal. Patent CN110137778A proposes an OEO structure based on fourier domain mode locking principle, and by using the structure, a chirp signal with a center frequency of 10 GHz and a bandwidth of 2.8 GHz is generated. According to the scheme, the dual-passband frequency-sweep microwave photonic filter is realized by utilizing two lasers, after the loop is closed, the frequency sweep period is adjusted to be the integral multiple of the frequency sweep period equal to the OEO loop length delay, the mode locking in a Fourier domain is realized, and finally the generation of dual chirp signals is realized. The scheme can directly generate broadband double-chirp microwave signals through self-excited oscillation in the photoelectric oscillator without a high-speed electronic device, but the double-chirp signals generated by the scheme have poor linearity, and because the wavelength stability of the two used lasers is different, the long-time working can cause larger deviation of the frequency of output signals, thereby influencing the application of the double-chirp microwave signals in systems such as radar, communication and the like; in addition, the two swept-frequency lasers driven by periodic current can theoretically realize the generation of double chirp signals with the bandwidth of dozens of GHz, but because the power of each wavelength output by the lasers is unstable, the oscillation starting condition of the OEO can be ensured only in a small range, and the bandwidth of the output signals is limited.
To sum up, the current scheme for generating the double chirp signal based on the dual-laser fourier domain mode-locked OEO mainly has the following problems: the linearity of output signals is poor, the long-time stability is poor, and the flexibility and adjustability of the bandwidth and the center frequency of the output signals are poor.
Disclosure of Invention
In view of the technical disadvantages, the present invention provides a dual chirp signal generation system based on stimulated brillouin scattering, which only needs one single-frequency dc laser source.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a double-chirp signal generation system based on stimulated Brillouin scattering comprises a direct-current laser 11, an optical coupler 21, a Mach-Zehnder electro-optic modulator (MZM) 31, a tunable microwave source 12, a first bias voltage source 61, a double-parallel Mach-Zehnder electro-optic modulator (DPMZM) 32, a 90-degree bridge 23, a linear frequency modulation source 13, a second bias voltage source 62, a first optical amplifier 71, a second optical amplifier 72, an optical circulator 22, an electro-optic phase modulator 33, a Brillouin gain medium 4, a transmission optical fiber 5, a photoelectric detector 8, an electrical amplifier 73 and an electrical demultiplexer 24.
The output end of the direct current laser 11 is connected with the input end of an optical coupler 21, the output end a of the optical coupler 21 is connected with the input end of the MZM 31, and the output end b of the optical coupler 21 is connected with the input end of the DPMZM 32; the MZM 31 radio frequency input end is connected with the output end of the tunable microwave source 12, and the MZM 31 bias voltage input end is connected with the output end of the first bias voltage source 61; the output of the MZM 31 is connected to the input of the first optical amplifier 71.
The optical circulator 22 has three ports, i.e., a port, b port and c port; the optical signal input from the a port is output from the b port, and the optical signal input from the b port is output from the c port.
The output of the first optical amplifier 71 is connected to the a port of the optical circulator 22.
The DPMZM 32 is characterized in that the DPMZM 32 is provided with two radio frequency input ends, the two radio frequency input ends are connected with two radio frequency output ends of a 90-degree electric bridge 23, the radio frequency input end of the 90-degree electric bridge 23 is connected with an output end of a linear frequency modulation source 13, and a bias voltage input end of the DPMZM 32 is connected with an output end of a second bias voltage source 62; the output end of the DPMZM 32 is connected with the input end of a second optical amplifier 72; the output end of the second optical amplifier 72 is connected with the input end of the electro-optical phase modulator 33, the radio frequency input end of the electro-optical phase modulator 33 is connected with the output end a of the electrical splitter 24, the output end of the electro-optical phase modulator 33 is connected with the input end of the brillouin gain medium 4, and the output end of the brillouin gain medium 4 is connected with the port b of the optical circulator 22.
The port c of the optical circulator 22 is connected with the input end of the transmission optical fiber 5, the output end of the transmission optical fiber 5 is connected with the input end of the photoelectric detector 8, the output end of the photoelectric detector 8 is connected with the input end of the electric amplifier 73, and the output end of the electric amplifier 73 is connected with the input end of the electric power divider 24; the output end b of the power divider 24 serves as a signal output port.
A double chirp signal generation system based on stimulated Brillouin scattering is characterized in that:
the direct current laser 11 generates a single-frequency direct current optical carrier; preferably, the dc laser 11 is a narrow linewidth laser in 1550nm band.
The optical coupler 21 splits the single-frequency dc optical carrier into two optical signals.
The MZM 31, the tunable microwave source 12 and the first bias voltage source 61 realize the suppression of carrier double-sideband modulation of the output optical signal of the a port of the optical coupler 21 and generate the double-wavelength pump light with tunable center frequency.
The first optical amplifier 71 is used to increase the pump light power to reach the brillouin threshold.
Further, the pumping light reversely enters the brillouin gain medium 4 through the optical circulator 22 to generate a stimulated brillouin effect, a narrow-band brillouin gain spectrum is generated in the low-frequency direction of the central frequency of the pumping light, a narrow-band brillouin attenuation spectrum is generated in the high-frequency direction of the same frequency interval, and the frequency interval is brillouin frequency shift quantity;
preferably, the brillouin gain medium 4 is a highly nonlinear optical fiber.
The DPMZM 32, the 90-degree electric bridge 23, the linear frequency modulation source 13 and the second bias voltage source 62 realize the suppression of the single-sideband modulation of the carrier wave of the output optical signal of the port b of the optical coupler 21 and generate a frequency-sweeping optical signal; the swept-frequency optical signal enters an electro-optical phase modulator 33 as an optical carrier, and the optical signal after phase modulation enters a Brillouin gain medium 4;
further, one sideband of the optical signal after phase modulation is amplified (or attenuated) in power by using a Brillouin gain spectrum (or attenuation spectrum), so that conversion from phase modulation to intensity modulation is realized;
further, the direct current laser 11, the optical coupler 21, the mach-zehnder electro-optic modulator (MZM) 31, the tunable microwave source 12, the first bias voltage source 61, the double-parallel mach-zehnder electro-optic modulator (MZM) 32, the 90 ° bridge 23, the linear frequency modulation source 13, the second bias voltage source 62, the first optical amplifier 71, the second optical amplifier 72, the optical circulator 22, the electro-optic phase modulator 33, the brillouin gain medium 4, the transmission fiber 5, and the photodetector 8 constitute a double-passband swept microwave photonic filter based on the stimulated brillouin scattering effect;
the scanning period of the dual-passband sweep-frequency microwave photonic filter is equal to the period of the output signal of the linear frequency modulation source 13
。
The electrical amplifier 73 is used for amplifying the radio frequency signal power; the electric power divider 24 performs power distribution on the amplified electric signal, the output of the b port is used as a system output signal, and the output of the a port is used as a feedback signal and is loaded on the electro-optical phase modulator 33, so as to form a closed OEO loop.
Further, in order to ensure that the frequency component of the dual chirp signal at each time can start oscillation in the OEO, it is necessary to satisfy the fourier mode locking condition, that is, the scanning period of the dual passband frequency sweep microwave photonic filter
Is equal to the OEO loop delay
，
，
Is a positive integer.
The bandwidth of the double chirp signal generated by the system of the invention is twice of the bandwidth of the output signal of the linear frequency modulation source 13, the signal period is consistent with the period of the output signal of the linear frequency modulation source 13, and the central frequency of the signal can tune the frequency of the output signal of the microwave source 12 by changing the frequency shift amount of the pump light, thereby realizing wide-range tuning.
The invention has the beneficial effects that: the double chirp signal with low phase noise can be obtained by utilizing an OEO structure; only one single-frequency direct-current laser source is utilized, so that the wavelength change of the upper branch pump light and the wavelength change of the lower branch signal light are consistent, and the long-time stability of system output is ensured; the linearity of an output signal can be ensured by driving the rapid scanning of the optical carrier wave by using a linear frequency modulation source; the parameters of the double chirp signals can be changed by changing the output parameters of the linear frequency modulation source and the tunable microwave source, so that the method is flexible and quick, and can be customized by a user.
Drawings
FIG. 1 is a schematic diagram of a system according to the present invention;
FIG. 2 is a schematic diagram illustrating the system principles provided by the present invention: (a) a schematic frequency domain diagram of the optical signal; (b) outputting a signal time-frequency mapping chart;
the optical fiber amplifier comprises a 4-Brillouin gain medium, a 5-transmission optical fiber, an 8-photoelectric detector, an 11-direct current laser, a 12-tunable microwave source, a 13-linear frequency modulation source, a 21-optical coupler, a 22-optical circulator, a 23-90-degree electric bridge, a 24-electric power divider, a 31-Mach-Zehnder electro-optic modulator, a 32-double parallel Mach-Zehnder electro-optic modulator, a 33-electro-optic phase modulator, a 61-first bias voltage source, a 62-second bias voltage source, a 71-first optical amplifier, a 72-second optical amplifier and a 73-electric amplifier.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to fig. 1 to 2 of the present invention, and other advantages and effects of the present invention can be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a stimulated brillouin scattering-based dual chirp signal generation system includes a direct current laser 11, an optical coupler 21, a mach-zehnder electro-optic modulator (MZM) 31, a tunable microwave source 12, a first bias voltage source 61, a dual parallel mach-zehnder electro-optic modulator (DPMZM) 32, a 90 ° bridge 23, a linear frequency modulation source 13, a second bias voltage source 62, a first optical amplifier 71, a second optical amplifier 72, an optical circulator 22, an electro-optic phase modulator 33, a brillouin gain medium 4, a transmission fiber 5, a photodetector 8, an electrical amplifier 73, and an electrical demultiplexer 24.
The direct current laser 11 generates a central frequency of
The optical coupler 21 divides the optical carrier into an upper branch and a lower branch, and outputs the upper branch and the lower branch from ports a and b of the optical coupler 21. The optical carrier of the upper branch circuit realizes the carrier-restraining double-sideband modulation after passing through the MZM 31, and the modulated optical signal, namely the central frequency of the pump light, is changed into
I.e. requiring the output signal of the tunable microwave source 12 to have a frequency of
As shown in fig. 2 (a). The pump light power reaches the brillouin threshold value by the first optical amplifier 71, the pump light is input from the port a of the optical circulator 22, output from the port b of the optical circulator 22, and reversely enter the brillouin gain medium 4, the stimulated brillouin scattering effect occurs, two narrow-band brillouin gain bands are formed in the low-frequency direction of the pump light center frequency, and the frequency interval is the brillouin frequency shift amount
The center frequencies are respectively located at
As shown in fig. 2 (a). For a certain brillouin gain medium,
the value of (c) is fixed.
The lower branch optical carrier realizes the suppression of carrier single sideband modulation through the DPMZM 32, the DPMZM 32 is driven by a periodic linear frequency modulation signal, and the conversion of the lower branch optical carrier from a single-frequency optical signal to a frequency sweeping optical signal is realized. As shown in FIG. 2, a period is selected as
Of the chirp signal, time scale
To
I.e. by
Each time point corresponds to a frequency
(frequency indices correspond one-to-one with time indices).
The optical signal frequency output by the time point DPMZM 32 is positioned at the optical frequency
At least one of (1) and (b);
preferably, selecting
。
And
And
by the way of analogy, the method can be used,
the frequency of the radio frequency signal generated at any moment is respectively
And
the radio frequency signal obtained after the beat frequency is divided into two paths by the electric power divider 24, the signal output from the end a is used as a feedback signal to be loaded on the electro-optical phase modulator 33, and a clockwise photoelectric oscillator structure is formed in fig. 1, namely, the electro-optical phase modulator 33, the brillouin gain medium 4, the optical circulator 22, the transmission optical fiber 5, the photoelectric detector 8, the electric amplifier 73, the electric power divider 24 and the electro-optical phase modulator 33. Setting chirp periodEqual to OEO loop delay
Then, the frequency of the feedback signal can be made to be exactly equal to the frequency component beat frequency in the sweep frequency optical signal and the Brillouin gain band at the moment to obtain the frequency of the radio frequency signal, so that the time division multiplexing oscillation starting is realized, namely the Fourier domain mode locking is realized.
As shown in (b) of fig. 2, the output signal at the b terminal of the power divider 24 has a center frequency located at
Having a period of
A bandwidth of
The double chirp signal of (1). By changing the frequency of the output signal of the tunable microwave source 12, the tuning of the center frequency of the output double chirp signal can be realized; the bandwidth and the period of the output double chirp signal can be changed by changing the bandwidth and the period of the output signal of the linear frequency modulation source.
In the description of the present invention, it is to be understood that the terms "counterclockwise", "clockwise", "up", "down", "front", "back", and the like, indicate orientations or positional relationships based on those shown in the drawings, are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention, for example: the lower branch circuit is used for inhibiting the modulation of a carrier single side band, the up-shift frequency of the optical carrier is realized, and the microwave photonic filter is realized by utilizing the stimulated Brillouin attenuation spectrum. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A double-chirp signal generation system based on stimulated Brillouin scattering is characterized by comprising a direct current laser (11), an optical coupler (21), a Mach-Zehnder electro-optic modulator (31), a tunable microwave source (12), a first bias voltage source (61), a double-parallel Mach-Zehnder electro-optic modulator (32), a 90-degree bridge (23), a linear frequency modulation source (13), a second bias voltage source (62), a first optical amplifier (71), a second optical amplifier (72), an optical circulator (22), an electro-optic phase modulator (33), a Brillouin gain medium (4), a transmission optical fiber (5), an optical detector (8), an electrical amplifier (73) and an electrical splitter (24);
the output end of the direct current laser (11) is connected with the input end of an optical coupler (21), the output end a of the optical coupler (21) is connected with the input end of a Mach-Zehnder electro-optic modulator (31), and the output end b of the optical coupler (21) is connected with the input end of a double-parallel Mach-Zehnder electro-optic modulator (32); the radio frequency input end of the Mach-Zehnder electro-optic modulator (31) is connected with the output end of the tunable microwave source (12), and the bias voltage input end of the Mach-Zehnder electro-optic modulator (31) is connected with the output end of the first bias voltage source (61); the output end of the Mach-Zehnder electro-optic modulator (31) is connected with the input end of the first optical amplifier (71); the output end of the first optical amplifier (71) is connected with the a port of the optical circulator (22); two radio frequency input ends of the double parallel Mach-Zehnder electro-optic modulator (32) are connected with two radio frequency output ends of the 90-degree electric bridge (23), the radio frequency input end of the 90-degree electric bridge (23) is connected with the output end of the linear frequency modulation source (13), and the bias voltage input end of the double parallel Mach-Zehnder electro-optic modulator (32) is connected with the output end of the second bias voltage source (62); the output end of the double parallel Mach-Zehnder electro-optic modulator (32) is connected with the input end of the second optical amplifier (72); the output end of the second optical amplifier (72) is connected with the input end of an electro-optical phase modulator (33), the radio-frequency input end of the electro-optical phase modulator (33) is connected with the output end a of the electric power splitter (24), the output end of the electro-optical phase modulator (33) is connected with the input end of a Brillouin gain medium (4), and the output end of the Brillouin gain medium (4) is connected with the port b of the optical circulator (22); the port c of the optical circulator (22) is connected with the input end of the transmission optical fiber (5), the output end of the transmission optical fiber (5) is connected with the input end of the photoelectric detector (8), the output end of the photoelectric detector (8) is connected with the input end of the electric amplifier (73), and the output end of the electric amplifier (73) is connected with the input end of the electric power divider (24); and the output end b of the electric power divider (24) is used as a signal output port.
2. The stimulated brillouin scattering-based double chirp signal generation system according to claim 1, wherein said direct current laser (11) generates a single-frequency direct current optical carrier; the direct current laser (11) is a narrow linewidth laser; the optical coupler (21) divides the single-frequency direct-current optical carrier into two optical signals; the Mach-Zehnder electro-optic modulator (31), the tunable microwave source (12) and the first bias voltage source (61) realize the suppression of carrier double-sideband modulation of an output optical signal at an a port of the optical coupler (21) and generate double-wavelength pump light with tunable center frequency; the first optical amplifier (71) is used for increasing the power of the pumping light to reach a Brillouin threshold value; furthermore, the pumping light reversely enters the Brillouin gain medium (4) through the optical circulator (22) to generate a stimulated Brillouin effect, a narrow-band Brillouin gain spectrum is generated in the low-frequency direction of the central frequency of the pumping light, a narrow-band Brillouin attenuation spectrum is generated in the high-frequency direction of the same frequency interval, and the frequency interval is Brillouin frequency shift amount.
3. The stimulated brillouin scattering-based dual chirp signal generation system according to claim 1, wherein the brillouin gain medium (4) is a highly nonlinear optical fiber; the dual-parallel Mach-Zehnder electro-optic modulator (32), the 90-degree electric bridge (23), the linear frequency modulation source (13) and the second bias voltage source (62) realize the suppression of carrier single-sideband modulation of an output optical signal at a port b of the optical coupler (21) and generate a frequency-sweeping optical signal; the swept-frequency optical signal enters an electro-optical phase modulator (33) as an optical carrier, and the optical signal after phase modulation enters a Brillouin gain medium (4); amplifying or attenuating one sideband power of the optical signal after phase modulation by using a Brillouin gain spectrum or an attenuation spectrum, and realizing the conversion from phase modulation to intensity modulation.
4. The stimulated brillouin scattering-based double chirp signal generation system according to claim 1, wherein the dc laser (11), the optical coupler (21), the mach-zehnder electro-optic modulator (31), the tunable microwave source (12), the first bias voltage source (61), the double parallel mach-zehnder electro-optic modulator (32), the 90 ° electrical bridge (23), the linear frequency modulation source (13), the second bias voltage source (62), the first optical amplifier (71), the second optical amplifier (72), the optical circulator (22), the electro-optic phase modulator (33), the brillouin gain medium (4), the transmission fiber (5), and the electro-optic detector (8) constitute a double-passband swept microwave photonic filter based on the stimulated brillouin scattering effect; the scanning period of the dual-passband sweep-frequency microwave photonic filter is equal to the period of the output signal of the linear frequency modulation source (13)
。
5. The stimulated brillouin scattering-based double chirp signal generation system according to claim 1, wherein said electrical amplifier (73) is for amplifying a beat-generated radio frequency signal power; the electric power divider (24) distributes power to the amplified electric signals, the output of the b port is used as a system output signal, the output of the a port is used as a feedback signal and is loaded on the electro-optical phase modulator (33), and a closed OEO loop is formed.
6. The system according to claim 4, wherein the Fourier lock is satisfied to ensure that the frequency component of the double chirp signal at each time is able to start oscillation in the OEOMode conditions, i.e. the sweep period of a dual-passband swept-frequency microwave photonic filter
Is equal to the OEO loop delay
，
，
Is a positive integer.
7. The system for generating a double chirp signal based on stimulated Brillouin scattering according to any one of claims 1 to 5, wherein: the bandwidth of the generated chirp signal is twice of the bandwidth of the output signal of the electro-optic phase modulator (33), the signal period is consistent with the output signal period of the linear frequency modulation source (13), and the central frequency of the signal can tune the output signal frequency of the microwave source (12) by changing the frequency shift amount of the pump light to realize wide-range tuning.
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| CN113193472B (en) * | 2021-05-08 | 2022-08-23 | 北方工业大学 | Initial chirp regulator for optical signal |
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| CN113589236B (en) * | 2021-07-22 | 2023-10-13 | 吉林大学 | Double-chirp waveform signal generator based on photoelectric oscillation loop structure |
| CN113810099B (en) * | 2021-08-20 | 2022-10-14 | 广东工业大学 | Optical time domain reflectometer based on asymmetric double-sideband chirped pulse modulation |
| CN113922884B (en) * | 2021-08-30 | 2023-02-28 | 北京航天控制仪器研究所 | Carrier suppression device and method for electro-optical modulator |
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| CN115144841B (en) * | 2022-05-30 | 2023-07-11 | 苏州大学 | Large-bandwidth linear frequency modulation signal generation device and method |
| CN115441951B (en) * | 2022-07-01 | 2024-04-19 | 中国电子科技集团公司第三十八研究所 | Device and method for suppressing periodic fading of microwave photon link transmission |
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| US10404371B2 (en) * | 2013-05-01 | 2019-09-03 | The United States Of America As Represented By The Secretary Of The Army | Opto-electronic oscillator with stimulated Brillouin scattering feedback |
| CN104618022B (en) * | 2015-01-29 | 2017-02-22 | 吉林大学 | Millimeter wave signal photonics generating method and millimeter wave signal photonics generating device |
| CN108494489A (en) * | 2018-03-27 | 2018-09-04 | 电子科技大学 | A kind of radiofrequency signal surely mutually transmits device and method |
| CN109450540B (en) * | 2018-08-10 | 2020-05-08 | 电子科技大学 | Tunable dual-passband microwave photonic filter implementation device and method |
| CN109347560B (en) * | 2018-09-26 | 2021-09-10 | 电子科技大学 | Free tunable dual-passband microwave photonic filter device and implementation method |
| CN109687259A (en) * | 2019-02-27 | 2019-04-26 | 中国科学院半导体研究所 | Chaos optical-electronic oscillator and its chaotic signal producing method |
| CN109842444B (en) * | 2019-03-11 | 2020-12-11 | 中国科学院半导体研究所 | Weak signal detection amplification system and method based on photoelectric oscillator |
| CN110137778A (en) * | 2019-05-06 | 2019-08-16 | 中国科学院半导体研究所 | Double chirp Fourier mode locking optical-electronic oscillators and application and communication system |
| CN110504613A (en) * | 2019-08-30 | 2019-11-26 | 中国科学院半导体研究所 | Fourier mode locking optical-electronic oscillator |
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