CN112558053A - Optical beam forming network device and method based on microwave photon true time delay - Google Patents
Optical beam forming network device and method based on microwave photon true time delay Download PDFInfo
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- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
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- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
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- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
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- G—PHYSICS
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- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
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- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
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Abstract
The invention relates to a microwave photon true time delay-based optical beam forming network device and a method, which comprises an M-path microwave photon true time delay device and M antennas, wherein a multi-wavelength laser source is connected with an electro-optical modulation module and then is connected with one end of a 1xN optical switch module 1 through a circulator, the other end of the 1xN optical switch module 1 is connected with one end of N high dispersion optical fibers and zero dispersion optical fibers with different lengths, the other ends of the high dispersion optical fibers and the zero dispersion optical fibers are connected with a 1xN optical switch module 2, the optical switch control module controls the two optical switch modules, the 1xN optical switch module 2 is connected with a chirp coefficient adjustable fiber grating module, the circulator is connected with one end of a wavelength division multiplexing module, the other end of the wavelength division multiplexing module is connected with one end of M photoelectric detectors through an optical fiber to finally form the M-path microwave photon true time delay device, the other ends of the M photoelectric detectors are connected with the corresponding M antennas, the ability to achieve large beam pointing range and fine beam pointing adjustment of optical beam forming networks.
Description
Technical Field
The invention relates to the field of microwave photon signal processing, in particular to an optical beam forming network device and method based on microwave photon true time delay.
Background
The optical beam forming network based on the microwave photon true time delay has important use value in the field of phased array radar. Compared with the phased array radar based on the electronic phase shift network, the phased array radar based on the true delay optical beam forming network has the advantages of light weight, low loss, large bandwidth, electromagnetic interference resistance and no influence of aperture transit time.
The microwave photon true delay device is a core module of the optical beam forming network. The existing microwave photon true time delay device is mainly based on optical devices such as an optical micro-ring, a dispersion optical fiber, a fiber Bragg grating and the like. The optical micro-ring based true time delay device needs a plurality of modulators and the working bandwidth is influenced by the Q value of the modulators; the true delay device based on the dispersion optical fiber can reduce the complexity of the system; linearly chirped fiber bragg gratings may also provide specific dispersion, which may further reduce the complexity of the system in place of dispersive fibers.
However, the real time delay device based on the above scheme needs to tune the time delay by tuning a plurality of optical wavelengths, so as to change the beam direction, which puts a severe requirement on the wavelength division multiplexing network at the back end of the system. Meanwhile, the optical beam forming network based on the microwave photon true delay device does not have the capability of simultaneously realizing large beam pointing range and fine beam pointing adjustment.
Disclosure of Invention
The invention provides a microwave photon true delay-based optical beam forming network device and method, which can reduce the requirement on a rear-end wavelength division multiplexing network, further reduce the realization difficulty of a system, and have the capability of realizing large beam pointing range and fine beam pointing adjustment.
The invention relates to a microwave photon true time delay-based optical beam forming network method, which comprises the following steps:
A. the multi-wavelength laser source generates M optical signals with equal wavelength intervals and transmits the optical signals with the equal wavelength intervals to the electro-optical modulation module, the electro-optical modulation module modulates radar signals onto the optical signals with the equal wavelength intervals and transmits the optical signals to the circulator, the circulator inputs the optical signals into the 1xN optical switch module 1 through ports P1 and P2 of the circulator, and M is a natural number;
the fixed multi-wavelength laser is used for replacing a multi-wavelength fiber laser needing tuning, the requirement on a rear-end wavelength division multiplexing network is lowered, and the implementation difficulty of the system is further lowered.
B. The optical switch control module controls the 1xN optical switch module 1 and the 1xN optical switch module 2 to select one path of high dispersion optical fiber from N paths of high dispersion optical fibers with different lengths, the 1xN optical switch module 1 transmits an optical signal to the 1xN optical switch module 2 through the selected high dispersion optical fiber, the zero dispersion optical fiber compensates the length of the high dispersion optical fiber, the optical signal of the 1xN optical switch module 2 is reflected by the chirp fiber bragg grating module with adjustable dispersion coefficient and then input into the 1xN optical switch module 2, the optical switch control module controls the 1xN optical switch module 2 to select one path of high dispersion optical fiber and then transmit the reflected optical signal to the 1xN optical switch module 1 to form equal interval delay difference, and then the optical signal is input into the wavelength division multiplexing module through ports P2 and P3 of the circulator;
C. the wavelength division multiplexing module divides M optical signals with equal wavelength intervals into M optical signals, and the optical wavelength of each optical signal is lambda from top to bottom in sequence1To lambdaMOptical signals with different wavelengths sequentially pass through optical fibers with the lengths of L1-LM and then are input into M photoelectric detectors to form equal delay time difference, the photoelectric detectors convert the optical signals into radar signals and then emit the radar signals through M antennas with the interval value of d, finally, an M-path optical beam forming network based on microwave photon true delay is formed, and the equal interval delay time difference of the M-path microwave photon true delay device and the beam pointing angle of the M-path optical beam forming network are obtained, wherein M is a natural number.
The large step adjustment of the equal delay difference is realized by switching N paths of high dispersion optical fibers, so that the large step adjustment of the beam direction of the beam forming network is realized; small step tuning of equal delay difference is realized by tuning the chirp fiber grating module with adjustable dispersion coefficient, so that small step tuning of beam pointing of the beam forming network is realized; finally, the large beam pointing range and the fine beam pointing adjustment capability of the optical beam forming network are realized.
Further, in step B, the equal-interval delay difference is obtained by the 1xN optical switch module 1 transmitting the optical signal through the high-dispersion optical fiber, the 1xN optical switch module 2 reflecting the optical signal through the chirped fiber grating module with adjustable dispersion coefficient, and the reflected optical signal transmitting the optical signal through the 1xN optical switch module 2 and the high-dispersion optical fiber into the 1xN optical switch module 1, and the equal-interval delay difference specifically is:
Δτ1＝2D1FNΔλ+D2Δλ
wherein D is1Representing the dispersion coefficient, F, of a highly dispersive optical fibreNDenotes the length of the high dispersion fiber, Δ λ denotes the wavelength interval value of the multi-wavelength laser source, D2And the initial dispersion coefficient of the chirp fiber grating module with the adjustable dispersion coefficient is shown.
Further, the interval value between the M antennas is: d ═ c/(2 f)m) C denotes the speed of light, fmRepresenting the radar signal center frequency.
Further, in step C, the equal interval delay difference of the M microwave photon true delay devices specifically includes:
Δτ＝Δτ1+Δτ2
wherein, Δ τ1For the equally spaced delay differences, Δ τ, obtained in step B2The equal delay difference is formed from the wavelength division multiplexing module to the photoelectric detector in the step C;
the beam pointing angle of the M-path optical beam forming network specifically includes:
θ＝arcsin(2fmΔτ)
wherein f ismThe central frequency of the radar signal is represented, and delta tau represents the equal interval delay difference of the M paths of microwave photon true delay devices.
The invention relates to an optical beam forming network device based on microwave photon true time delay, which comprises an antenna and M paths of microwave photon true time delay devices, wherein the M paths of microwave photon true time delay devices are connected with the antenna, and the microwave photon true time delay devices comprise:
and the antennas are used for transmitting the radar signals generated by the M paths of microwave photon true time delay devices into space, and the interval value of the M antennas is d.
Further, the M-path microwave photon true time delay device includes a multi-wavelength laser source, the multi-wavelength laser source is connected to the electro-optical modulation module, the electro-optical modulation module is connected to one end of the 1xN optical switch module 1 through a circulator, the other end of the 1xN optical switch module 1 is connected to one end of the N high dispersion optical fibers and zero dispersion optical fibers with different lengths, the other end of the high dispersion optical fibers and zero dispersion optical fibers is connected to the 1xN optical switch module 2, the optical switch control module is connected to the 1xN optical switch module 1 and the 1xN optical switch module 2, the 1xN optical switch module 2 is connected to the chirp fiber grating module with adjustable dispersion coefficient, the circulator is connected to one end of the wavelength division multiplexing module, the other end of the wavelength division multiplexing module is connected to one end of the M photodetectors through the optical fibers, the other end of the M photodetectors is connected to the corresponding M antennas, wherein:
the multi-wavelength laser source is used for generating M optical signals with equal wavelength intervals, and the wavelength intervals are delta lambda;
the electro-optical modulation module is used for modulating the radar signals to M optical signals with equal wavelength intervals;
a circulator having three ports P1, P2, and P3 for transmitting the modulated optical signal to the 1xN optical switch module 1 and transmitting the optical signal from the 1xN optical switch module 1 to the wavelength division multiplexing module;
a 1xN optical switch module 1, configured to switch the modulated optical signal from the circulator to N paths of high-dispersion optical fibers with different lengths, where the lengths of the N paths of high-dispersion optical fibers are sequentially F1 to FN;
the high-dispersion optical fiber is used for providing large-step equal-interval delay difference for the M-path true delay device;
the zero-dispersion optical fiber is used for compensating the length of the high-dispersion optical fiber, so that the physical lengths of the N paths of optical fibers are the same;
the 1xN optical switch module 2 is used for being matched with the 1xN optical switch module 1 to use and switching the modulated optical signal to N paths of high-dispersion optical fibers with different lengths;
the optical switch control module is used for controlling the 1xN optical switch module 1 and the 1xN optical switch module 2 so as to select optical signals to pass through high-dispersion optical fibers with different lengths;
the chirp fiber grating module with the adjustable dispersion coefficient is used for providing small-step equal-interval delay difference for the M-path true delay device;
a wavelength division multiplexing module for dividing the M optical signals with equal wavelength interval into M optical signals, the optical wavelength of each optical signal is lambda from top to bottom1To lambdaMOptical signals with different wavelengths sequentially pass through optical fibers with the lengths from L1 to LM;
and a photodetector for converting the modulated optical signal into a radar signal.
Further, the circulator has three ports P1, P2 and P3, the electro-optical modulation module is connected with the circulator through the P1 port of the circulator, the P2 port of the circulator is connected with one end of the 1xN optical switch module 1, and the P3 port of the circulator is connected with one end of the wavelength division multiplexing module.
Furthermore, the chirp fiber grating module with the adjustable dispersion coefficient comprises a fixed clamp end, a chirp fiber grating, a sliding clamp end and a sliding guide rail, wherein the fixed clamp end fixes one end of the chirp fiber grating on the sliding guide rail, and the sliding clamp end slidably connects the other end of the chirp fiber grating with the sliding guide rail.
Two ends of the linear chirped fiber grating are arranged on a straight guide rail, one end of the linear chirped fiber grating is fixed, and the dispersion coefficient of the linear chirped fiber grating is finely adjusted by pulling the other end of the linear chirped fiber grating, so that small-step equal-interval delay difference is provided for the M-path true delay device.
The invention relates to an optical beam forming network device and method based on microwave photon true time delay, which reduces the requirement on a rear-end wavelength division multiplexing network by using a fixed multi-wavelength laser to replace a multi-wavelength optical fiber laser needing tuning, thereby reducing the realization difficulty of a system; by switching N paths of high-dispersion optical fibers, large step tuning of equal interval delay difference delta tau is realized in M paths of true delay devices, and further large step adjustment of beam pointing of a beam forming network is realized; two ends of the linear chirped fiber grating are arranged on a straight guide rail, one end of the linear chirped fiber grating is fixed, and the color of the linear chirped fiber grating is finely adjusted by pulling the other end of the linear chirped fiber gratingCoefficient of divergence D2And small step tuning of the equal interval delay difference delta tau is realized in the M paths of real time delay devices, and finally the large beam pointing range and the fine beam pointing adjustment capability of the optical beam forming network are realized.
Drawings
Fig. 1 is a schematic diagram of a microwave photon true delay based beam forming network according to the present invention.
Fig. 2 is a schematic diagram of an abb tunable chirped fiber grating module according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples. This should not be understood as limiting the scope of the above-described subject matter of the present invention to the following examples. Various substitutions and alterations according to the general knowledge and conventional practice in the art are intended to be included within the scope of the present invention without departing from the technical spirit of the present invention as described above.
Fig. 1 shows a schematic diagram of a microwave photon true delay based beam forming network according to the present invention, which includes:
A. the multi-wavelength laser source generates M optical signals with equal wavelength intervals and transmits the optical signals with the equal wavelength intervals to the electro-optical modulation module, the electro-optical modulation module modulates radar signals onto the optical signals with the equal wavelength intervals and transmits the optical signals to the circulator, the circulator inputs the optical signals into the 1xN optical switch module 1 through ports P1 and P2 of the circulator, and M is a natural number;
B. the optical switch control module controls the 1xN optical switch module 1 and the 1xN optical switch module 2 to select one path of high dispersion optical fiber from N paths of high dispersion optical fibers with different lengths, the 1xN optical switch module 1 transmits an optical signal to the 1xN optical switch module 2 through the selected high dispersion optical fiber, the zero dispersion optical fiber compensates the length of the high dispersion optical fiber, the optical signal of the 1xN optical switch module 2 is reflected by the chirp fiber bragg grating module with adjustable dispersion coefficient and then input into the 1xN optical switch module 2, the optical switch control module controls the 1xN optical switch module 2 to select one path of high dispersion optical fiber and then transmit the reflected optical signal to the 1xN optical switch module 1 to form equal interval delay difference, and then the optical signal is input into the wavelength division multiplexing module through ports P2 and P3 of the circulator;
the equal-interval delay difference is obtained by the following steps that an optical signal is transmitted into the 1xN optical switch module 1 through a high-dispersion optical fiber, the 1xN optical switch module 2 is reflected by the chirp fiber bragg grating module with the adjustable dispersion coefficient, and the reflected optical signal is transmitted into the 1xN optical switch module 1 through the 1xN optical switch module 2 and the high-dispersion optical fiber, wherein the equal-interval delay difference is specifically as follows:
Δτ1＝2D1FNΔλ+D2Δλ
wherein D is1Representing the dispersion coefficient, F, of a highly dispersive optical fibreNDenotes the length of the high dispersion fiber, Δ λ denotes the wavelength interval value of the multi-wavelength laser source, D2And the initial dispersion coefficient of the chirp fiber grating module with the adjustable dispersion coefficient is shown.
C. The wavelength division multiplexing module divides M optical signals with equal wavelength intervals into M optical signals, and the optical wavelength of each optical signal is lambda from top to bottom in sequence1To lambdaMOptical signals with different wavelengths sequentially pass through optical fibers with the lengths of L1-LM and then are input into M photoelectric detectors to form equal delay time difference, the photoelectric detectors convert the optical signals into radar signals and then emit the radar signals through M antennas with the distance of d, and finally an M-path optical beam forming network based on microwave photon true delay is formed, so that the equal interval delay time difference of the M-path microwave photon true delay device and the beam pointing angle of the M-path optical beam forming network are obtained, and M is a natural number.
The equal interval delay difference of the M microwave photon true delay devices is specifically as follows:
Δτ＝Δτ1+Δτ2
wherein, Δ τ1For the equally spaced delay differences, Δ τ, obtained in step B2The equal delay difference is formed from the wavelength division multiplexing module to the photoelectric detector in the step C;
the beam pointing angle of the M-path optical beam forming network specifically includes:
θ＝arcsin(2fmΔτ)
wherein f ismThe central frequency of the radar signal is represented, and delta tau represents the equal interval delay difference of the M paths of microwave photon true delay devices.
The beam pointing angles of the M-path optical beam forming network are affected by equal delay differences, and the beam pointing angles are different under different equal delay differences.
The invention also provides a microwave photon true delay-based optical beam forming network device, which comprises: the microwave photon real time delay device comprises an antenna and M paths of microwave photon real time delay devices, wherein the M paths of microwave photon real time delay devices are connected with the antenna.
In this embodiment, the M-path microwave photon true delay apparatus includes a multi-wavelength laser source, the multi-wavelength laser source is connected to an electro-optical modulation module, the electro-optical modulation module is connected to one end of a 1xN optical switch module 1 through a circulator, the other end of the 1xN optical switch module 1 is connected to one end of N high-dispersion optical fibers and one end of N zero-dispersion optical fibers with different lengths, the other ends of the high-dispersion optical fibers and the zero-dispersion optical fibers are connected to a 1xN optical switch module 2, an optical switch control module is connected to the 1xN optical switch module 1 and the 1xN optical switch module 2 in a control manner, the 1xN optical switch module 2 is connected to a chirp fiber grating module with an adjustable dispersion coefficient, the circulator is connected to one end of a wavelength division multiplexing module, the other end of the wavelength division multiplexing module is connected to one end of M photodetectors through optical fibers, and the other end of.
In this embodiment, the circulator has three ports P1, P2, and P3, the electro-optical modulation module is connected to the circulator through the P1 port of the circulator, the P2 port of the circulator is connected to one end of the 1xN optical switch module 1, and the P3 port of the circulator is connected to one end of the wavelength division multiplexing module.
In this embodiment, the interval value between M antennas is: d ═ c/(2 f)m) C denotes the speed of light, fmRepresenting the radar signal center frequency.
Fig. 2 is a schematic diagram of an abb tunable chirped fiber grating module according to the present invention, including: the fixed clamp end fixes one end of the chirped fiber grating on the sliding guide rail, and the sliding clamp end slidably connects the other end of the chirped fiber grating with the sliding guide rail.
In the embodiment, two ends of the linear chirped fiber grating are arranged on a straight guide rail, one end of the linear chirped fiber grating is fixed, and the dispersion coefficient of the linear chirped fiber grating is finely adjusted by pulling the other end of the linear chirped fiber grating, so that small-step equal-interval delay difference is provided for the M-path true delay device; or the linear chirped fiber grating can be selectively heated to fine tune the dispersion coefficient of the fiber grating, so that small stepping equal interval delay difference is provided for the M-path true delay device.
Example (b):
the multi-wavelength laser source generates M optical signals with equal wavelength intervals, M is 8, the wavelength interval value Delta lambda of the multi-wavelength laser source is 1.6nm, the number of high-dispersion optical fibers and zero-dispersion optical fibers is 10, and the dispersion coefficient D of the high-dispersion optical fibers is set1250ps/(km nm), length F of high dispersion fiber1To FNThe length of the fiber grating is 0, 24m, 48m, 72m, 96m, 120m, 144m, 168m, 192m, 216m and 240m in sequence, and the initial dispersion coefficient D of the fiber grating module with the adjustable dispersion coefficient and the chirp is2The tuning range of the radar is 3-9ps/nm, the tuning step is 0.1ps/nm, and the center frequency f of the radar signalmIs 10 GHz; the adjustment range of the equidistant delay time difference delta tau of the M paths of microwave photon true delay devices is-48 ps to +48ps, the tuning stepping is 0.16ps, the beam pointing angle range of the M paths of optical beam forming networks is-73.74 degrees to +73.74 degrees, and the beam pointing angle adjustment stepping is 1.15 degrees when the beam pointing angle is near 0 degree.
The invention realizes the large step adjustment of the equal delay difference delta tau by switching N paths of high dispersion optical fibers, thereby realizing the large step adjustment of the beam direction of the beam forming network; the small step tuning of the equal delay difference delta tau is realized by tuning the chirp fiber bragg grating module with the adjustable dispersion coefficient, so that the small step tuning of the beam pointing direction of the beam forming network is realized; finally, the large beam pointing range and the fine beam pointing adjustment capability of the optical beam forming network are realized. Meanwhile, the wavelength of the multi-wavelength light source of the microwave photon true time delay device is fixed, and the microwave photon true time delay device has the advantage of low requirement on a wavelength division multiplexing module; the fixed multi-wavelength laser is used for replacing a multi-wavelength fiber laser needing tuning, the requirement on a rear-end wavelength division multiplexing network is lowered, and the implementation difficulty of the system is further lowered.
Claims (8)
1. The optical beam forming network method based on the microwave photon true time delay is characterized by comprising the following steps:
A. the multi-wavelength laser source generates M optical signals with equal wavelength intervals and transmits the optical signals with the equal wavelength intervals to the electro-optical modulation module, the electro-optical modulation module modulates radar signals onto the optical signals with the equal wavelength intervals and transmits the optical signals to the circulator, the circulator inputs the optical signals into the 1xN optical switch module 1 through ports P1 and P2 of the circulator, and M is a natural number;
B. the optical switch control module controls the 1xN optical switch module 1 and the 1xN optical switch module 2 to select one path of high dispersion optical fiber from N paths of high dispersion optical fibers with different lengths, the 1xN optical switch module 1 transmits an optical signal to the 1xN optical switch module 2 through the selected high dispersion optical fiber, the zero dispersion optical fiber compensates the length of the high dispersion optical fiber, the optical signal of the 1xN optical switch module 2 is reflected by the chirp fiber bragg grating module with adjustable dispersion coefficient and then input into the 1xN optical switch module 2, the optical switch control module controls the 1xN optical switch module 2 to select one path of high dispersion optical fiber and then transmit the reflected optical signal to the 1xN optical switch module 1 to form equal interval delay difference, and then the optical signal is input into the wavelength division multiplexing module through ports P2 and P3 of the circulator;
C. the wavelength division multiplexing module divides M optical signals with equal wavelength intervals into M optical signals, and the optical wavelength of each optical signal is lambda from top to bottom in sequence1To lambdaMOptical signals with different wavelengths sequentially pass through optical fibers with the lengths of L1-LM and then are input into M photoelectric detectors to form equal-interval delay time difference, the photoelectric detectors convert the optical signals into radar signals and then emit the radar signals through M antennas with the interval value of d, finally, an M-path optical beam forming network based on microwave photon true delay is formed, and the equal-interval delay time difference of the M-path microwave photon true delay device and a beam pointing angle of the M-path optical beam forming network are obtained, wherein M is a natural number.
2. The method according to claim 1, wherein in step B, the equi-spaced delay difference is obtained by the 1xN optical switch module 1 transmitting the optical signal through the high dispersion fiber, the 1xN optical switch module 2 then reflecting the optical signal through the chirped fiber grating module with adjustable dispersion coefficient, and the reflected optical signal passes through the 1xN optical switch module 2 and the high dispersion fiber and then transmits the optical signal into the 1xN optical switch module 1, and the equi-spaced delay difference is specifically:
Δτ1＝2D1FNΔλ+D2Δλ
wherein D is1Representing the dispersion coefficient, F, of a highly dispersive optical fibreNDenotes the length of the high dispersion fiber, Δ λ denotes the wavelength interval value of the multi-wavelength laser source, D2And the initial dispersion coefficient of the chirp fiber grating module with the adjustable dispersion coefficient is shown.
3. The microwave photonic true delay based optical beam forming network method according to claim 1, wherein in step C, the interval value between the M antennas is: d ═ c/(2 f)m) C denotes the speed of light, fmRepresenting the radar signal center frequency.
4. The microwave-photon-true-delay-based optical beam forming networking method according to claim 1, wherein in step C, the equal-interval delay difference of the M-path microwave-photon true-delay apparatus is specifically:
Δτ＝Δτ1+Δτ2
wherein, Δ τ1For the equally spaced delay differences, Δ τ, obtained in step B2C, forming equal interval delay difference from the wavelength division multiplexing module to the photoelectric detector in the step C;
the beam pointing angle of the M-path optical beam forming network specifically includes:
θ＝arcsin(2fmΔτ)
wherein f ismThe central frequency of the radar signal is represented, and delta tau represents the equal interval delay difference of the M paths of microwave photon true delay devices.
5. The optical beam forming network device based on microwave photon true time delay comprises an antenna and is characterized by further comprising M paths of microwave photon true time delay devices, and the M paths of microwave photon true time delay devices are connected with the antenna.
6. The microwave-photon-based optical beam forming network apparatus for true time delay according to claim 4, wherein the M-channel microwave-photon true time delay apparatus comprises a multi-wavelength laser source, the multi-wavelength laser source is connected to an electro-optical modulation module, the electro-optical modulation module is connected to one end of a 1xN optical switch module 1 through a circulator, the other end of the 1xN optical switch module 1 is connected to one end of N high dispersion optical fibers and zero dispersion optical fibers having different lengths, the other ends of the high dispersion optical fibers and the zero dispersion optical fibers are connected to a 1xN optical switch module 2, the optical switch control module is in control connection with the 1xN optical switch modules 1 and 2, the 1xN optical switch module 2 is connected to an abb-adjustable chirped fiber grating module, the circulator is connected to one end of a wavelength division multiplexing module, and the other end of the wavelength division multiplexing module is connected to one end of M photodetectors through an optical fiber, the other ends of the M photoelectric detectors are connected with the corresponding M antennas.
7. The microwave photonic real time delay based optical beam forming network device according to claim 5, wherein the circulator has three ports P1, P2, and P3, the electro-optical modulation module is connected to the circulator through the P1 port of the circulator, the P2 port of the circulator is connected to one end of the 1xN optical switch module 1, and the P3 port of the circulator is connected to one end of the wavelength division multiplexing module.
8. The microwave photonic true-delay-based optical beam forming network device according to claim 4, wherein the dispersion coefficient adjustable chirped fiber grating module comprises a fixed clamp end, a chirped fiber grating, a sliding clamp end, and a sliding guide rail, wherein the fixed clamp end fixes one end of the chirped fiber grating on the sliding guide rail, and the sliding clamp end slidably connects the other end of the chirped fiber grating with the sliding guide rail.
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