阅读说明：本技术 一种收发共用的二维可重构光控波束形成网络装置 (Two-dimensional reconfigurable light-operated beam forming network device shared by transceiving ) 是由 张程慧 杨杰 于 2021-07-14 设计创作，主要内容包括：本发明公开了一种收发共用的二维可重构光控波束形成网络装置,涉及相控阵雷达领域。该装置的第一光功分器的1路输出端与第一调制解调模块连接,N路输出端与调制解调阵列的一端连接；第一调制解调模块还与光色散延时单元连接；光色散延时单元与第二光功分器的输入端连接,第二光功分器的N路输出端与光开关延时单元连接；光开关延时单元还与调制解调阵列的另一端连接。本发明适用于基于微波光子真延时的技术实现的相控阵天线,实现了波束在方位向和俯仰向二维控制,并通过上述拓扑结构,使天线发射和接收都使用同一套延时网络,实现发射波束与接收波束的双向共用。(The invention discloses a two-dimensional reconfigurable light-controlled beam forming network device shared by transceiving, and relates to the field of phased array radar. The output end of the first optical power divider of the device is connected with a first modulation and demodulation module in the way of 1, and the output end of the first optical power divider in the way of N is connected with one end of a modulation and demodulation array; the first modulation and demodulation module is also connected with the light dispersion delay unit; the optical dispersion delay unit is connected with the input end of the second optical power splitter, and the N-path output end of the second optical power splitter is connected with the optical switch delay unit; the optical switch time delay unit is also connected with the other end of the modulation and demodulation array. The invention is suitable for the phased array antenna realized based on the microwave photon true time delay technology, realizes the two-dimensional control of the wave beam in the azimuth direction and the pitching direction, and leads the antenna to transmit and receive by using the same set of time delay network through the topological structure, thereby realizing the two-way sharing of the transmitting wave beam and the receiving wave beam.)

1. A two-dimensional reconfigurable optically-controlled beamforming network device for both transmit and receive, comprising: the optical power splitter comprises a first optical power splitter, a second optical power splitter, a first modulation and demodulation module, an optical dispersion delay unit, an optical switch delay unit and a modulation and demodulation array, wherein:

the first optical power splitter has N +1 output ends, the 1 output end is connected with the first modulation and demodulation module, and the N output ends are connected with one end of the modulation and demodulation array;

the first modulation and demodulation module is further connected with the optical dispersion delay unit, and is used for loading an electrical signal onto an optical carrier signal and demodulating the electrical signal from the optical signal;

the optical dispersion delay unit is connected with an input end of the second optical power splitter, the second optical power splitter has N output ends, the N output ends of the second optical power splitter are connected with the optical switch delay unit, the optical dispersion delay unit is used for providing delay required by the antenna array during scanning in the pitching direction, and the optical switch delay unit is used for providing delay required by the antenna array during scanning in the azimuth direction;

the optical switch delay unit is also connected with the other end of the modulation and demodulation array;

wherein, N is more than 1, and N is the column number of the antenna array.

2. The transceiver-shared two-dimensional reconfigurable optically-controlled beamforming network device of claim 1, wherein the modem array comprises: n modem subarrays, each of the modem subarrays comprising: first optical wavelength division multiplexer, second optical wavelength division multiplexer, M second modem module and M electric circulator, wherein:

each second modulation and demodulation module is respectively connected with each electric circulator, the input end of each second modulation and demodulation module is connected with the first optical wavelength division multiplexer, and the output end of each second modulation and demodulation module is connected with the second optical wavelength division multiplexer;

the first optical wavelength division multiplexers of the N modulation and demodulation subarrays are respectively connected with the N output ends of the first optical power splitter in a one-to-one correspondence manner, and the second optical wavelength division multiplexers of the N modulation and demodulation subarrays are respectively connected with the N output ends of the second optical power splitter in a one-to-one correspondence manner;

wherein M is more than 1, and M is the row number of the antenna array.

3. The transceiver-shared two-dimensional reconfigurable optically-controlled beam-forming network device according to claim 2, wherein the second modem module comprises: a second optical circulator, a second electro-optic modulator, and a second photodetector, wherein:

one end of the second optical circulator is connected with the second optical wavelength division multiplexer, and the other end of the second optical circulator is respectively connected with the output end of the second electro-optical modulator and the input end of the second photoelectric detector;

the input end of the second electro-optical modulator is connected with the first optical wavelength division multiplexer;

the electric circulator is respectively connected with the electric communication end of the second electro-optical modulator and the electric communication end of the second photoelectric detector.

4. The transceiver-shared two-dimensional reconfigurable optically-controlled beamforming network device of claim 3, wherein the electrical circulator is further connected to the antenna elements of the antenna array.

5. The transceiver-shared two-dimensional reconfigurable optically-controlled beam-forming network device according to claim 1, wherein the first modem module comprises: a first optical circulator, a first electro-optic modulator, and a first photodetector, wherein:

one end of the first optical circulator is connected with the optical dispersion delay unit, and the other end of the first optical circulator is respectively connected with the output end of the first electro-optical modulator and the input end of the first photoelectric detector;

and the input end of the first electro-optical modulator is connected with the 1-path output end of the first optical power splitter.

6. The transceiver-shared two-dimensional reconfigurable optically-controlled beam-forming network device according to claim 1, wherein the optical dispersion delay unit comprises: 2 first 1 x 2 optical switches, P-1 first 2 x 2 optical switches, a first single mode fiber, and a first dispersive fiber, wherein:

1 first 1 × 2 optical switch, P-1 first 2 × 2 optical switches, and 1 first 1 × 2 optical switch are connected in series in sequence, an upper path between any two adjacent optical switches is connected by the first dispersive optical fiber whose length is increased in sequence, and a lower path between any two adjacent optical switches is connected by the first single-mode optical fiber whose length is fixed;

wherein P is the number of bits of the light dispersion delay unit.

7. The transceiver-shared two-dimensional reconfigurable optically-controlled beam-forming network device according to claim 1, wherein the optical switch delay unit comprises: 2 second 1 × 2 optical switches, Q-1 second 2 × 2 optical switches, a second single-mode fiber, and a third single-mode fiber, wherein:

1 second 1 × 2 optical switch, Q-1 second 2 × 2 optical switches, and 1 second 1 × 2 optical switch are sequentially connected in series, an upper path between any two adjacent optical switches is connected by the second single-mode fiber, a lower path between any two adjacent optical switches is connected by the third single-mode fiber, and a difference in length between the upper path and the lower path between the two adjacent optical switches increases sequentially;

wherein, Q is the digit of the optical switch delay unit.

8. The transceiver-shared two-dimensional reconfigurable optically controlled beamforming network device according to any of claims 1 to 7, further comprising: a multi-wavelength array laser and amplifier, wherein:

the output end of the multi-wavelength array laser is connected with the input end of the amplifier, the output end of the amplifier is connected with the input end of the first optical power divider, the multi-wavelength array laser is used for generating optical carrier signals with preset wavelength intervals, and the amplifier is used for amplifying the optical carrier signals generated by the multi-wavelength array laser and sending the amplified optical carrier signals to the first optical power divider.

9. A phased array radar comprising a two-dimensional reconfigurable optically controlled beamforming network device in common for transceiving according to any of claims 1 to 8.

10. A communication system comprising a two-dimensional reconfigurable optically controlled beamforming network device in common use for transceiving according to any of claims 1 to 8.

Technical Field

The invention relates to the field of phased array radars, in particular to a transmitting and receiving shared two-dimensional reconfigurable light-controlled beam forming network device.

Background

Under the working condition of large instantaneous bandwidth, the traditional phased array antenna uses a phase shifter to scan beams, and the phenomenon of beam pointing deflection can occur. And accurate beam pointing under large instantaneous bandwidth can be realized by adopting the technology based on microwave photon true time delay.

However, the current optical control beam forming network device is mainly proposed for a one-dimensional linear array, and is generally only suitable for a transmitting end or a receiving end of an antenna, and two-dimensional control of two-way sharing cannot be realized, so that the current optical control beam forming network device has poor practicability and poor expansibility.

Disclosure of Invention

The invention aims to solve the technical problem of providing a two-dimensional reconfigurable light-controlled beam forming network device for transmitting and receiving.

The technical scheme for solving the technical problems is as follows:

a transceiving shared two-dimensional reconfigurable optically controlled beam forming network device comprises: the optical power splitter comprises a first optical power splitter, a second optical power splitter, a first modulation and demodulation module, an optical dispersion delay unit, an optical switch delay unit and a modulation and demodulation array, wherein:

the first optical power splitter has N +1 output ends, the 1 output end is connected with the first modulation and demodulation module, and the N output ends are connected with one end of the modulation and demodulation array;

the first modulation and demodulation module is further connected with the optical dispersion delay unit, and is used for loading an electrical signal onto an optical carrier signal and demodulating the electrical signal from the optical signal;

the optical dispersion delay unit is connected with an input end of the second optical power splitter, the second optical power splitter has N output ends, the N output ends of the second optical power splitter are connected with the optical switch delay unit, the optical dispersion delay unit is used for providing delay required by the antenna array during scanning in the pitching direction, and the optical switch delay unit is used for providing delay required by the antenna array during scanning in the azimuth direction;

the optical switch delay unit is also connected with the other end of the modulation and demodulation array;

wherein, N is more than 1, and N is the column number of the antenna array.

Another technical solution of the present invention for solving the above technical problems is as follows:

a phased array radar comprises the two-dimensional reconfigurable optically-controlled beam forming network device which is used for receiving and transmitting.

Another technical solution of the present invention for solving the above technical problems is as follows:

a communication system includes the two-dimensional reconfigurable optically-controlled beam forming network device for transmitting and receiving.

The invention has the beneficial effects that: the light-operated beam forming network device provided by the invention is suitable for a phased array antenna realized based on a microwave photon true delay technology, the time delay required by the antenna array in the pitching direction scanning is provided through the light dispersion delay unit, the time delay required by the antenna array in the azimuth direction scanning is provided through the light switch delay unit, the two-dimensional control of the beam in the azimuth direction and the pitching direction is realized, the same delay network is used for both transmitting and receiving the antenna through the topological structure, the two-way sharing of the transmitting beam and the receiving beam is realized, the complexity of the antenna beam control network is effectively simplified, the light-operated beam forming network device can be used only by adding a small number of devices when the scale of the antenna needs to be expanded, and the practicability and the expansibility of the light-operated beam forming network device are improved.

Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural framework diagram provided in an embodiment of a light-controlled beam forming network apparatus according to the present invention;

fig. 2 is a schematic structural diagram of a light-controlled beam forming network apparatus according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of an optical dispersion delay unit according to another embodiment of the optical control beam forming network device of the present invention;

fig. 4 is a schematic structural diagram of an optical switch delay unit according to another embodiment of the optical control beam forming network apparatus of the present invention.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

It should be understood that the optically controlled beamforming network apparatus of the present invention is used in a phased array antenna, and the input optical carrier signal may be generated by a multi-wavelength array laser and input from a first optical power splitter. For an M × N antenna array, the present invention only needs 1 optical dispersion delay unit and N optical switch delay units, and compared with the conventional scheme, the present invention uses fewer optical delay units and has a lower system complexity.

Under the non-full-array working state, the position and the size of the practically used wavefront can be controlled by selecting the wavelength range output by the array wavelength laser.

The invention is further illustrated with reference to the following examples.

As shown in fig. 1, a schematic structural framework diagram provided for an embodiment of the light-controlled beam forming network device of the present invention is a light-controlled beam forming network device, where the light-controlled beam forming network device can implement two-dimensional reconfigurable transceiving, and the light-controlled beam forming network device includes: a first optical power splitter 10, a second optical power splitter 20, a first modem module 30, an optical dispersion delay unit 40, an optical switch delay unit 50, and a modem array 60, where:

the first optical power splitter 10 is a 1 × (N +1) power splitter, and has 1 input terminal and N +1 output terminals, and is configured to split an input optical carrier signal into N +1 channels with equal power. The output end of the 1 path is connected with the first modulation and demodulation module 30, and the output end of the N paths is connected with one end of the modulation and demodulation array 60;

the first modem module 30 is further connected to the optical dispersion delay unit 40, and the first modem module 30 is configured to load an electrical signal onto an optical carrier signal and demodulate the electrical signal from the optical signal;

the optical dispersion delay unit 40 is connected to an input end of the second optical power splitter 20, where the second optical power splitter 20 is a 1 × N power splitter, and has 1 input end and N output ends in total, and is configured to divide the optical carrier signal into N paths with equal power. The N output ends of the second optical power splitter 20 are connected to the optical switch delay unit 50, the optical dispersion delay unit 40 is configured to provide a delay required by the antenna array during scanning in the elevation direction, and the optical switch delay unit 50 is configured to provide a delay required by the antenna array during scanning in the azimuth direction;

the optical switch delay unit 50 is also connected with the other end of the modulation and demodulation array 60;

wherein, N is more than 1, N is the column number of the antenna array, and the array antenna is formed by arranging M rows and N columns of antenna units and is used for transmitting or receiving electric signals.

It should be understood that the optically controlled beam forming network device provided in this embodiment may implement gating of the antenna unit channels by artificially selecting the optical wavelength range output by the multi-wavelength array laser. Under the condition of non-full-array working, partial antenna units can work, and the positions and the sizes of the antenna units are controllable.

The light-operated beam forming network device provided by the embodiment is suitable for a phased array antenna realized based on a microwave photon true delay technology, the time delay required by the antenna array in the pitching scanning process is provided through the light dispersion delay unit 40, the time delay required by the antenna array in the azimuth scanning process is provided through the light switch delay unit 50, the two-dimensional control of the beam in the azimuth and the pitching scanning process is realized, the same delay network is used for both the transmitting and receiving of the antenna through the topological structure, the two-way sharing of the transmitting beam and the receiving beam is realized, the complexity of the antenna beam control network is effectively simplified, when the scale of the antenna needs to be expanded, the light-operated beam forming network device can be used only by adding a small number of devices, and the practicability and the expansibility of the light-operated beam forming network device are improved.

Fig. 2 is a schematic structural diagram of a light-controlled beam forming network apparatus according to another embodiment of the present invention, and some alternative embodiments of the present invention are described below with reference to fig. 2.

Alternatively, in some possible embodiments, as shown in fig. 2, the modem array 60 includes: n modem subarrays, each modem subarray comprising: a first optical wavelength division multiplexer 61, a second optical wavelength division multiplexer 62, M second modem modules 63, and M electrical circulators 64, wherein:

each second modem module 63 is connected to each electrical circulator 64, and the input end of each second modem module 63 is connected to the first optical wavelength division multiplexer 61, and the output end is connected to the second optical wavelength division multiplexer 62;

first optical wavelength division multiplexers 61 of the N modulation and demodulation subarrays are respectively connected with N output ends of the first optical power splitter 10 in a one-to-one correspondence manner, second optical wavelength division multiplexers 62 of the N modulation and demodulation subarrays are respectively connected with N output ends of the second optical power splitter 20 in a one-to-one correspondence manner, and the first optical wavelength division multiplexers 61 and the second optical wavelength division multiplexers 62 are used for separating optical carrier signals of multiple wavelengths into M optical carrier signals of different wavelengths according to the wavelengths;

wherein M is more than 1, and M is the row number of the antenna array.

Optionally, in some possible embodiments, as shown in fig. 2, the second modem module 63 includes: a second optical circulator 631, a second electro-optic modulator 632, and a second photodetector 633, wherein:

one end of a second optical circulator 631 is connected to the second optical wavelength division multiplexer 62, and the other end is connected to the output end of the second electro-optical modulator 632 and the input end of a second photodetector 633 respectively, the second optical circulator 631 is configured to separate the transmitted optical signal from the received optical signal, the second photodetector 633 is configured to detect the optical signal at the transmitting end, convert the optical signal into an electrical signal, and send the electrical signal to the antenna unit, and the second electro-optical modulator 632 is configured to load the electrical signal received by the antenna unit onto an optical carrier signal;

for example, the second electro-optical modulator 632 may be a mach-zehnder modulator, which is modulated by quadrature intensity modulation;

the input end of the second electro-optical modulator 632 is connected to the first optical wavelength division multiplexer 61;

the electrical circulator 64 is connected to an electrical communication terminal of the second electro-optic modulator 632 and an electrical communication terminal of the second photodetector 633, respectively.

Optionally, in some possible embodiments, as shown in fig. 2, the electrical circulator 64 is also connected to the antenna elements of the antenna array.

Optionally, in some possible embodiments, as shown in fig. 2, the first modem module 30 includes: a first optical circulator 31, a first electro-optical modulator 32 and a first photodetector 33, wherein:

one end of the first optical circulator 31 is connected to the optical dispersion delay unit 40, and the other end is connected to the output end of the first electro-optical modulator 32 and the input end of the first photodetector 33, respectively, the first optical circulator 31 is configured to separate the emitted optical signal from the received optical signal, the first photodetector 33 is configured to detect the optical signal whose receiving end has undergone delay compensation, and convert the optical signal into an electrical signal, and the first electro-optical modulator 32 is configured to load the electrical signal to be emitted onto the optical carrier signal;

for example, the first electro-optical modulator 32 may be a mach-zehnder modulator in which the modulation method is quadrature intensity modulation.

The input terminal of the first electro-optical modulator 32 is connected to the 1-way output terminal of the first optical power splitter 10.

Optionally, in some possible embodiments, the light dispersion delay unit 40 includes: 2 first 1 × 2 optical switches 41, P-1 first 2 × 2 optical switches 44, a first single-mode fiber 43, and a first dispersive fiber 42, wherein:

1 first 1 × 2 optical switch 41, P-1 first 2 × 2 optical switch 44 and 1 first 1 × 2 optical switch 41 are connected in series in sequence, the upper path between any two adjacent optical switches is connected by a first dispersive optical fiber 42 with sequentially increasing length, and the lower path between any two adjacent optical switches is connected by a first single-mode optical fiber 43 with fixed length;

where P is the number of bits of the light dispersion delay element 40.

As shown in fig. 3, a schematic structural diagram of an optical dispersion delay unit 40 provided for another embodiment of the optical control beam forming network device of the present invention is that optical switches are divided into two types, one is a 1 × 2 optical switch, and the other is a 2 × 2 optical switch, 2 1 × 2 optical switches are respectively disposed at the head and the tail, P-1 2 optical switches are respectively disposed in the middle, and the optical switches are sequentially connected end to end.

The length of the first dispersive optical fiber 42 that is added is from the optical input side to the optical outputOn the outlet side, can be 2 in sequence^n-1×L₁N is 1,2,3 …, P, D, and L is the length of the first single mode fiber 43₀，L₀Is the distance between two adjacent optical switches.

The operation of the optical dispersion delay unit 40 will be described below.

Taking the transmission mode as an example, after the optical dispersion delay unit 40 performs delay compensation on the signal, the optical carrier λ passes through the first optical power splitter 10, the optical switch delay unit 50 and the second optical wavelength division multiplexer 62₁Second photodetector 633, lambda fed into the rear end of the first row of antenna elements₂Second photodetector 633 … … lambda fed into the rear end of the second row of antenna elements_MAnd is fed to the second photodetector 633 at the rear end of the M-th row of antenna elements. When the wavelength interval of M optical carriers generated by the multi-wavelength array laser is Δ λ, λ is known from the principle that Δ τ is D · Δ λ · L₁～λ_MThe delay differences introduced by the optical carrier after passing through the light dispersion delay unit 40 are Δ τ,2 Δ τ … … (M-1) Δ τ, respectively. When the optical dispersion delay unit 40 switches the physical path length through which the optical signal passes by the optical switch, Δ τ varies with L. For the P-bit light dispersion delay unit 40, 2 can be realized^P-1 delay state. When the delay difference delta tau between every two pitching units is changed, the beam scanning can be realized.

Optionally, in some possible embodiments, the optical switch delay unit 50 includes: 2 second 1 × 2 optical switches 51, Q-1 second 2 × 2 optical switches 54, a second single-mode fiber 52, and a third single-mode fiber 53, wherein:

the 1 second 1 × 2 optical switch 51, the Q-1 second 2 × 2 optical switch 54, and the 1 second 1 × 2 optical switch 51 are sequentially connected in series, an upper path between any two adjacent optical switches is connected by a second single-mode fiber 52, a lower path between any two adjacent optical switches is connected by a third single-mode fiber 53, and a difference in length between the upper path and the lower path between the two adjacent optical switches increases sequentially;

wherein Q is the number of bits of the optical switch delay unit 50.

As shown in fig. 4, a schematic structural diagram of an optical switch delay unit 50 provided for another embodiment of the optical control beam forming network device of the present invention is provided, where the optical switches are divided into two types, one type is a 1 × 2 optical switch, and the other type is a 2 × 2 optical switch, 2 1 × 2 optical switches are respectively disposed at the head and the tail, Q-1 2 optical switches are respectively disposed in the middle, and the optical switches are sequentially connected end to end.

The length difference between the second single-mode fiber 52 on the upper path and the third single-mode fiber 53 on the lower path may be 2 in order from the light input side to the light output side^n-1×L₂N is 1,2,3 …, Q, and the length of the third single mode fiber 53 is L₂，L₂Is the distance between two adjacent optical switches.

The operation of the optical switch delay unit 50 will be explained below.

The M rows and N columns of antenna array employ N optical switch delay cells 50. As shown in fig. 2, OTTD-1 controls the delay required for azimuth scanning of the first column antenna, and OTTD-2 controls the delay required for azimuth scanning of the second column antenna … … OTTD-N controls the phase required for azimuth scanning of the nth column antenna. Taking the transmission mode as an example, the multi-wavelength carrier signal is sent to OTTD-1, OTTD-2 … … OTTD-N through the second optical power splitter 20 after the pitch-direction delay compensation of the optical dispersion delay unit 40. In OTTD-1, the multi-wavelength optical carrier is made to pass through different physical lengths by switching the state of the optical switch. Since the optical switch delay unit 50 is connected by a common single-mode fiber, the dispersion coefficient is small and the length is short, so that the optical delay difference introduced based on the fiber dispersion can be ignored for optical carriers with different wavelengths in the optical switch delay unit 50. According to the principle Δ τ ═ nL₂And c, the delay compensation quantity of the multi-wavelength optical carrier in the OTTD-1 is delta tau. Similarly, the delay compensation obtained by the multi-wavelength optical carrier in OTTD-2 is 2 Δ τ … … and the delay compensation obtained in OTTD-N is N Δ τ. When the optical switch is switched, the delta tau is changed, and further beam scanning of the antenna array in the azimuth direction is achieved.

By adopting the optical dispersion delay unit 40 and the optical switch delay unit 50 disclosed in the above embodiments, the limitation on the instantaneous bandwidth of the antenna only depends on the bandwidths of the electro-optical modulator and the photodetector, and the bandwidth of the electro-optical modulator can reach tens of GHz, so that a larger instantaneous bandwidth can be realized, the use requirement of the antenna can be met, the beam pointing is realized without deflection, and the two-dimensional control of the antenna beam in the azimuth direction and the pitch direction can be realized.

Optionally, in some possible embodiments, as shown in fig. 2, the method further includes: a multi-wavelength array laser 70 and an amplifier 80, wherein:

the output end of the multi-wavelength array laser 70 is connected to the input end of the amplifier, the output end of the amplifier 80 is connected to the input end of the first optical power splitter 10, the multi-wavelength array laser 70 is configured to generate optical carrier signals with preset wavelength intervals, and the amplifier 80 is configured to amplify the optical carrier signals generated by the multi-wavelength array laser and send the amplified optical carrier signals to the first optical power splitter 10.

Specifically, the multi-wavelength array laser 70 is used to generate M optical carriers with wavelength intervals Δ λ, where the carrier wavelengths are λ₁λ₂…λ_M。

The operation flow of the optically controlled beam forming network device provided by the present invention is described below with reference to fig. 2, and the present device relates to two operation modes, i.e., transmission and reception.

In the transmission mode, after the multi-wavelength carrier generated by the multi-wavelength array laser 70 is amplified by the optical amplifier 80 and power-split by the first optical power splitter 10, one of the paths is sent to the first electro-optical modulator 32, an electrical signal to be transmitted is loaded onto the multi-wavelength optical carrier by the first electro-optical modulator 32, and then the electrical signal is sent to the optical dispersion delay unit 40 by the first optical circulator 31 for pitch-direction delay compensation. The optical signal after the first time delay compensation is successfully transmitted to the N optical switch delay units 50 through the second optical power splitter 20. Each optical switch delay unit 50 performs azimuth delay compensation on the optical signal and sends the optical signal to the second optical wavelength division multiplexer 62. The second optical wavelength division multiplexer 62 separates the multi-wavelength optical signals into M single-wavelength optical signals, which are sent to the second photodetector 633 through the second optical circulator 631 to demodulate the electrical signals. The electrical signal is sent to the antenna unit via the electrical circulator 64 and radiated.

In the receiving mode, after the multi-wavelength carrier generated by the multi-wavelength array laser 70 is amplified by the optical amplifier 80 and power-divided by the first optical power divider 10, N paths thereof are respectively sent to the first optical wavelength division multiplexer 61. The first optical wavelength division multiplexer 61 separates the multi-wavelength optical signal into M single-wavelength optical carriers, and sends the M single-wavelength optical carriers to the second electro-optical modulators 632 in the corresponding columns. The electrical signal received by the antenna unit is applied to the optical carrier through the second electro-optical modulator 632 after passing through the electrical circulator 64. Then, the optical signals in each column are combined into a multi-wavelength optical signal through the second optical circulator 631 and the second optical wavelength division multiplexer 62, and sent to the optical switch delay unit 50 for azimuth delay compensation. The N multi-wavelength optical signals are combined into one path through the first optical power splitter 10, and then sent to the optical dispersion delay unit 40 for pitch-direction delay compensation, and then sent to the first photodetector 33 through the first optical circulator 31, and the electrical signal is demodulated and sent to the next stage for processing.

It is to be understood that some or all of the various embodiments described above may be included in some embodiments.

The invention also provides a phased array radar which comprises the two-dimensional reconfigurable optically-controlled beam forming network device which is used for receiving and transmitting and is disclosed by any embodiment mode.

It should be appreciated that the phased array radar may be a phased array radar implemented based on microwave photon true time delay techniques. The method can realize accurate beam pointing under large instantaneous bandwidth, has the advantages of small volume, light weight, electromagnetic interference resistance and the like, and has wide application prospect in the fields of ultra-wideband radar, electronic countermeasure and the like.

The invention also provides a communication system which comprises the two-dimensional reconfigurable optically-controlled beam forming network device which is used for receiving and transmitting the beams and is disclosed by any embodiment mode.

Optionally, the communication system may include: the system comprises a server, a terminal and a phased array radar, wherein after signals are collected by an array antenna of the phased array radar, the signals are processed by the light-controlled beam forming network device disclosed in the embodiment and then are sent to the terminal, and after data are processed and displayed by the terminal, the data are sent to the server for storage.

The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described method embodiments are merely illustrative, and for example, the division of steps into only one logical functional division may be implemented in practice in another way, for example, multiple steps may be combined or integrated into another step, or some features may be omitted, or not implemented.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.