CN116155391B - Bandwidth and center frequency adjustable microwave photon filtering system - Google Patents
Bandwidth and center frequency adjustable microwave photon filtering system Download PDFInfo
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- CN116155391B CN116155391B CN202211530597.1A CN202211530597A CN116155391B CN 116155391 B CN116155391 B CN 116155391B CN 202211530597 A CN202211530597 A CN 202211530597A CN 116155391 B CN116155391 B CN 116155391B
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Abstract
The invention discloses a bandwidth and center frequency adjustable microwave photon filtering system, which improves the out-of-band inhibition of a microwave photon filter by adopting polarization control optimization measures and optical link length control optimization measures and adopting a method of interfering an optical signal which is primarily filtered based on a Brillouin effect with a homologous same-wavelength optical signal; meanwhile, the wavelength division multiplexer is used for introducing the radio frequency optical carrier signal with another wavelength to control the phase of the system, so that the problem of system phase drift is avoided, the complexity of the system is not increased additionally, and the center frequency and bandwidth adjustable function of the filter is realized by loading the linear frequency modulation and continuous wave synthesized signal on the intensity modulator, so that the performance of the microwave photon filtering system is improved greatly, and the system has good practical value.
Description
Technical Field
The invention relates to the technical field of microwave photon filtering systems, in particular to a microwave photon filtering system with adjustable bandwidth and center frequency.
Background
The microwave photon filter (Microwave photonic filter: MPF) modulates the microwave signal to be filtered onto the optical carrier wave, processes the signal by an optical system composed of various photon devices, and then obtains the microwave signal with the required frequency by photoelectric detection. The microwave photon filter is mainly applied to a microwave photon link, realizes screening, selecting and optimizing of signals, and can eliminate channel interference and inhibit noise. With the development of optical devices and optical communication, microwave photon filters are widely applied, and are mainly applied to the fields of optical carrier wireless communication (ROF) systems, ultra-wideband signal generation systems, photoelectric oscillators, satellite remote sensing, radars and the like. The structural design of the microwave photon filter almost always modulates microwave signals onto an optical carrier through a modulator, and different frequency responses are realized through different photon devices. Tunable and reconfigurable are two important characteristics of microwave photon filters, and have a significant impact on the filtering effect of the filter. The tunable microwave photon filter refers to a tunable filter, such as a light source device, a modulator, a delay device, etc., so that the center frequency of a pass band of the filter or the frequency interval between two filter pass bands/stop bands is changed. According to different implementation principles, the method can be divided into: the microwave photon filter based on stimulated Brillouin effect, and the microwave photon filter based on optical fiber parametric amplification principle and frequency transfer. According to the difference of the time delay devices, the method can be divided into: the device comprises a microwave photon filter based on an optical fiber delay line, an optical fiber ring microwave photon filter, an optical fiber grating microwave photon filter and a microwave photon filter based on a dispersion compensation optical fiber.
Early pass bands of microwave photon filters based on fiber delay lines and fiber gratings are multi-tapped, which limits free spectral range and the center frequency of the pass band is not easy to tune; later developed microwave photon filters based on phase modulators and stimulated brillouin scattering. The microwave photon filter based on PM and SBS realizes tunable band-pass function, and the principle is as follows: brillouin selective sideband amplification to achieve efficient PM-AM conversion, when the phase modulated sidebands fall into the SBS gain spectrum, the corresponding sidebands are amplified, and vice versa, reduced. However, the optical filter based on the Brillouin effect often has a narrow bandwidth, and the passband bandwidth is limited by the line width of the optical fiber Brillouin gain spectrum to 30MHz, so that only narrow-band filtering can be realized. The conventional microwave photon filter realizes the adjustment of the center frequency of the filter by introducing a pump laser and adjusting the wavelength of the pump laser, but the system needs to additionally add the pump laser, and the wavelength adjustment range of the pump laser is limited.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention provides a microwave photon filtering system with adjustable bandwidth and center frequency.
The invention provides a bandwidth and center frequency adjustable microwave photon filtering system, which comprises: the optical fiber module comprises a main laser module, an intensity modulator module, an optical amplifier module, a first optical circulator module, a phase modulator module, an optical isolator module, a wavelength division multiplexing module, a wavelength division demultiplexing module, a first photoelectric detector module, a second optical circulator module, an optical fiber module, a first optical coupler module and a second optical coupler module;
the optical output end of the main laser module is connected with the input end of the first optical coupler module, and the first output end of the first optical coupler module is sequentially connected with the intensity modulator module, the optical amplifier module and the A port of the first optical circulator module; the second output end of the first optical coupler module is sequentially connected with the phase modulator module, the optical isolator module, the optical fiber module and the port B of the first optical circulator module; the third output end of the first optical coupler module is connected with the first input end of the wavelength division multiplexing module, the common-path output end of the wavelength division multiplexing module is connected with the A end of the second optical circulator module, and the C end of the second optical circulator module is connected with the common-path input end of the wavelength division demultiplexing module;
the C end of the first optical circulator module and the first output end of the de-wavelength division multiplexing module are respectively connected with the input end of the second optical coupler module, and the first photoelectric detector module is connected with the output end of the second optical coupler module;
the intensity modulator module is provided with a central reference signal interface, the phase modulator module is provided with a signal interface to be filtered, and the output end of the first photoelectric detector module is a filtered signal outlet.
Preferably, the method further comprises: the device comprises a direct-tuning laser module, an adjustable optical fiber delay module, a mixer module, a 1*2 radio frequency power divider module, a radio frequency phase discriminator module and a second photoelectric detector module;
the optical output end of the direct-tuning laser module is connected with the second input end of the wavelength division multiplexing module, the 1*2 radio frequency power divider module is provided with a stable phase signal interface, the radio frequency input end of the direct-tuning laser module is connected with the O port of the 1*2 radio frequency power divider module, the Q end of the mixer module is connected with the P port of the 1*2 radio frequency power divider module, and the R port of the mixer module is connected with the radio frequency output port of the second photoelectric detector module;
the input port of the radio frequency phase discriminator module is connected with the combining end of the mixer module, and the output of the radio frequency phase discriminator module is connected with the input control port of the adjustable optical fiber delay module.
Preferably, the wavelength of the direct-tuning laser module is different from the primary laser module.
Preferably, the main laser module is an external cavity semiconductor laser or DFB laser.
Preferably, the intensity modulator module is a mach-zehnder intensity modulator.
Preferably, the fiber optic module is a long-haul single-mode fiber or a highly nonlinear fiber.
In the invention, the provided microwave photon filtering system with adjustable bandwidth and center frequency, the light output by the main laser module is divided into three light paths by the first optical coupler module, and the first light path sequentially passes through the A ports of the intensity modulator module, the optical amplifier module and the first optical circulator module; the second optical path sequentially passes through the phase modulator module, the optical isolator module, the optical fiber module and the port B of the first optical circulator module; the third optical path sequentially passes through the first input end of the wavelength division multiplexing module, the A end of the second optical circulator module and the common-path input end of the wavelength division multiplexing module. The out-of-band rejection of the microwave photon filter is improved by adopting polarization control optimization measures and optical link length control optimization measures and a method of interfering an optical signal which is primarily filtered based on the Brillouin effect with a homologous same-wavelength optical signal; meanwhile, the wavelength division multiplexer is used for introducing the radio frequency optical carrier signal with another wavelength to control the phase of the system, so that the problem of system phase drift is avoided, the complexity of the system is not increased additionally, and the center frequency and bandwidth adjustable function of the filter is realized by loading the linear frequency modulation and continuous wave synthesized signal on the intensity modulator, so that the performance of the microwave photon filtering system is improved greatly, and the system has good practical value.
Drawings
Fig. 1 is a schematic diagram of module connection of an embodiment of a bandwidth and center frequency tunable microwave photonic filtering system according to the present invention.
Fig. 2 is a schematic signal flow diagram of an embodiment of a bandwidth and center frequency tunable microwave photonic filtering system according to the present invention.
Detailed Description
Fig. 1 and 2 show schematic block connections of an embodiment of a bandwidth and center frequency adjustable microwave photon filtering system according to the present invention, and fig. 2 shows a signal flow schematic of an embodiment of a bandwidth and center frequency adjustable microwave photon filtering system according to the present invention.
Referring to fig. 1 and 2, the microwave photon filtering system with adjustable bandwidth and center frequency according to the present invention includes: a main laser module 1, an intensity modulator module 2, an optical amplifier module 3, a first optical circulator module 4, a phase modulator module 5, an optical isolator module 6, a wavelength division multiplexing module 8, a wavelength division demultiplexing module 10, a first photodetector module 11, a second optical circulator module 15, an optical fiber module 17, a first optical coupler module 18, and a second optical coupler module 19;
the optical output end of the main laser module 1 is connected with the input end of the first optical coupler module 18, and the first output end of the first optical coupler module 18 is connected with the A port of the intensity modulator module 2, the optical amplifier module 3 and the first optical circulator module 4 in sequence; the second output end of the first optical coupler module 18 is sequentially connected with the phase modulator module 5, the optical isolator module 6, the optical fiber module 17 and the port B of the first optical circulator module 4; the third output end of the first optical coupler module 18 is connected with the first input end of the wavelength division multiplexing module 8, the common-path output end of the wavelength division multiplexing module 8 is connected with the A end of the second optical circulator module 15, and the C end of the second optical circulator module 15 is connected with the common-path input end of the wavelength division demultiplexing module 10;
the C end of the first optical circulator module 4 and the first output end of the de-wavelength division multiplexing module 10 are respectively connected with the input end of the second optical coupler module 19, and the first photoelectric detector module 11 is connected with the output end of the second optical coupler module 19;
the intensity modulator module 2 is provided with a central reference signal interface, the phase modulator module 5 is provided with a signal interface to be filtered, and the output end of the first photoelectric detector module 11 is a filtered signal outlet.
In the specific operation of the microwave photon filtering system of this embodiment, first, the output light of the main laser module 1 is divided into three paths by the first optical coupler module 18. The first path of light sequentially passes through the intensity modulator module 2, the optical amplifier module 3 and the A port of the first optical circulator module 4, and the second path of light sequentially passes through the phase modulator module 5 and the optical isolator module 6 and enters the optical fiber module 17. The third light sequentially passes through the first input end of the wavelength division multiplexing module 8, the second optical circulator module 15 and the wavelength division multiplexing module 10. The C port of the first optical circulator module 4 and the first output of the de-wavelength division multiplexing module 10 are connected to two inputs of an optical coupler module 19.
The center reference signal F1 is loaded onto the intensity modulator module 2 through a radio frequency interface, the center reference signal being a combination of a chirp signal and a continuous wave signal. The signal F2 to be filtered is loaded onto the phase modulator module 5 through the radio frequency interface, and the filtered signal F4 is output from the radio frequency interface of the first photodetector module 11. Since the light input from the a port of the optical circulator module 4 is output from the B port, the light input from the B port is output from the C port. Therefore, the port A of the first optical circulator is an input end of light output by the optical amplifier, and amplified light enters the optical fiber from the port B of the first optical circulator to generate a Brillouin effect so as to filter the F2 signal.
In a specific choice of lasers, the main laser module 1 is an external cavity semiconductor laser or DFB laser, the wavelength being selected from the C-band standard ITU wavelengths. The same configuration can be adopted for the direct-tuning laser module 7, and the wavelength of the direct-tuning laser module 7 is different from that of the main laser module 1, so that the direct-tuning laser module 7 falls in a channel of the wavelength division multiplexing module 8.
In wavelength tuning, the wavelength division multiplexing module 8 operates at a wavelength that matches the selected combination of laser wavelengths and designs.
In a practical choice of the individual functional modules, the intensity modulator module 2 is a mach-zehnder type intensity modulator. The fiber module 17 is a long-distance single-mode fiber or a high-nonlinearity fiber to ensure the generation of the brillouin effect.
In the embodiment, the bandwidth and the center frequency of the microwave photon filtering system are adjustable, and the out-of-band rejection of the microwave photon filter is improved by adopting polarization control optimization measures and optical link length control optimization measures to interfere the optical signal which is primarily filtered based on the Brillouin effect with the homologous same-wavelength optical signal; meanwhile, the wavelength division multiplexer is used for introducing the radio frequency optical carrier signal with another wavelength to control the phase of the system, so that the problem of system phase drift is avoided, the complexity of the system is not increased additionally, and the center frequency and bandwidth adjustable function of the filter is realized by loading the linear frequency modulation and continuous wave synthesized signal on the intensity modulator, so that the performance of the microwave photon filtering system is improved greatly, and the system has good practical value.
In a specific implementation manner, in order to stabilize the phase of the modulated signal, the microwave photon filtering system of this embodiment further includes: the device comprises a direct-tuning laser module 7, a tunable optical fiber delay module 9, a mixer module 12, a 1*2 radio frequency power divider module 13, a radio frequency phase detector module 14 and a second photoelectric detector module 16;
the optical output end of the direct-tuning laser module 7 is connected with the second input end of the wavelength division multiplexing module 8, the 1*2 radio frequency power divider module 13 is provided with a stable phase signal interface, the radio frequency input end of the direct-tuning laser module 7 is connected with the O port of the 1*2 radio frequency power divider module 13, the Q end of the mixer module 12 is connected with the P port of the 1*2 radio frequency power divider module 13, and the R port of the mixer module 12 is connected with the radio frequency output port of the second photoelectric detector module 16;
the input port of the radio frequency phase detector module 14 is connected with the combining end of the mixer module 12, and the output of the radio frequency phase detector module 14 is connected with the input control port of the adjustable optical fiber delay module 9.
In specific phase stabilization operation, the radio frequency signal F3 for phase stabilization is connected to the input end of the 1*2 radio frequency power divider module 13, and the O port of the radio frequency signal F3 is connected to the radio frequency input port of the direct modulation laser module 7. The P port of the 1*2 rf power divider module is connected to the Q port of the mixer module 12. The R port of the mixer module 12 is connected to the radio frequency output port of the second photodetector module 16. An input port of the radio frequency phase detector block 14 is connected to a combining terminal of the mixer block 12. The output of the radio frequency phase detector module 14 is connected to the input control port of the adjustable optical fiber delay module 9. The length of the adjustable optical fiber delay module 9 and the state of the polarization controller are adjusted simultaneously by adjusting the width of the linear frequency modulation signal and the central frequency of the continuous wave signal loaded on the intensity modulator, so that the light of the M port and the N port is interfered to achieve an ideal filtering effect, and the function of adjusting the bandwidth and the central frequency is realized.
In the phase stabilization process, the phase discrimination result of the radio frequency phase discriminator module 14 directly controls the adjustable optical fiber delay module 9, and the maximum delay amount of the adjustable optical fiber delay module 9 is selected according to the system.
The system is simple, realizes the center frequency and bandwidth adjustable function of the filter through polarization control, phase stabilization design and adjustment of the optical adjustable fiber delay module, and is suitable for occasions such as all-optical processing of microwave signals, an optical carrier wireless communication system and the like.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. A bandwidth and center frequency tunable microwave photonic filtering system comprising: a main laser module (1), an intensity modulator module (2), an optical amplifier module (3), a first optical circulator module (4), a phase modulator module (5), an optical isolator module (6), a wavelength division multiplexing module (8), a wavelength division demultiplexing module (10), a first photodetector module (11), a second optical circulator module (15), an optical fiber module (17), a first optical coupler module (18) and a second optical coupler module (19);
the optical output end of the main laser module (1) is connected with the input end of the first optical coupler module (18), and the first output end of the first optical coupler module (18) is sequentially connected with the intensity modulator module (2), the optical amplifier module (3) and the A port of the first optical circulator module (4); the second output end of the first optical coupler module (18) is sequentially connected with the phase modulator module (5), the optical isolator module (6), the optical fiber module (17) and the port B of the first optical circulator module (4); the third output end of the first optical coupler module (18) is connected with the first input end of the wavelength division multiplexing module (8), the common-path output end of the wavelength division multiplexing module (8) is connected with the A end of the second optical circulator module (15), and the C end of the second optical circulator module (15) is connected with the common-path input end of the wavelength division demultiplexing module (10);
the C end of the first optical circulator module (4) and the first output end of the de-wavelength division multiplexing module (10) are respectively connected with the input end of the second optical coupler module (19), and the first photoelectric detector module (11) is connected with the output end of the second optical coupler module (19);
the intensity modulator module (2) is provided with a central reference signal interface, the phase modulator module (5) is provided with a signal interface to be filtered, and the output end of the first photoelectric detector module (11) is a filtered signal outlet;
further comprises: the device comprises a direct-tuning laser module (7), an adjustable optical fiber delay module (9), a mixer module (12), a 1*2 radio frequency power divider module (13), a radio frequency phase discriminator module (14) and a second photoelectric detector module (16);
the optical output end of the direct-tuning laser module (7) is connected with the second input end of the wavelength division multiplexing module (8), a phase-stabilizing signal interface is arranged on the 1*2 radio frequency power divider module (13), the radio frequency input end of the direct-tuning laser module (7) is connected with an O port of the 1*2 radio frequency power divider module (13), the Q end of the mixer module (12) is connected with a P port of the 1*2 radio frequency power divider module (13), and the R port of the mixer module (12) is connected with a radio frequency output port of the second photoelectric detector module (16);
the input port of the radio frequency phase detector module (14) is connected with the combining end of the mixer module (12), and the output of the radio frequency phase detector module (14) is connected with the input control port of the adjustable optical fiber delay module (9).
2. The bandwidth and center frequency tunable microwave photon filtering system according to claim 1, characterized in that the wavelength of the direct-tuning laser module (7) is different from the main laser module (1).
3. The bandwidth and center frequency tunable microwave photonic filtering system according to claim 1, characterized in that the main laser module (1) is an external cavity semiconductor laser or DFB laser.
4. The bandwidth and center frequency tunable microwave photon filtering system according to claim 1, characterized in that the intensity modulator module (2) is a mach-zehnder type intensity modulator.
5. The bandwidth and center frequency tunable microwave photonic filter system according to claim 1, wherein the fiber module (17) is a long-distance single-mode fiber or a highly nonlinear fiber.
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