Photoelectric fusion integrated device and method based on optical waveguide silicon-based optical phased array

Abstract

The invention relates to the technical field of space laser communication, in particular to a photoelectric fusion integrated device and method based on an optical waveguide silicon-based optical phased array (OPA), and the device comprises an FPGA comprehensive processing module, a laser driver, a laser generator, an OPA antenna, an OPA drive circuit, a CCD / CMOS sensor, a CCD / CMOS control circuit, a signal amplifier and a DDR3 storage chip. All the units are integrated on the same PCB, the FPGA comprehensive processing module is connected with the OPA driving circuit, the DDR3 storage chip, the laser driver, the signal amplifier and the CCD / CMOS control circuit, the laser generator is connected with the laser driver, the OPA antenna is connected with the laser generator and the OPA driving circuit, and the CCD / CMOS sensor is connected with the signal amplifier and the CCD / CMOS control circuit. The system has the advantages of being high in integration level, small in size, light in weight and high in flexibility, and signal processing and image processing software can be customized or reconstructed according to actual requirements.

Description

Technical Field

[0001] The present invention relates to the field of space laser communication technology, and in particular to an optoelectronic fusion integrated device and method based on an optical waveguide silicon-based optical phased array. Background Art

[0002] Optical phased array technology has the characteristics of fast response speed, high pointing accuracy, small size, light weight and high integration. Compared with traditional microwave communication, it has the advantages of high bandwidth, low noise, high confidentiality and anti-electromagnetic interference. It has broad application prospects in the fields of space laser communication, solid-state laser radar, etc.

[0003] At present, space laser communication systems mostly use optical antennas, PAT coarse-fine composite axis servo turntables, and designs based on ARM chips and ASIC integrated circuits. This solution includes optics, servo motors, piezoelectric fast mirrors and other devices. It is difficult to achieve high integration, lightweight and software reconfigurability, and there are still major limitations.

[0004] Therefore, how to achieve high integration, lightweight and software-reusable structure of space laser systems has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to provide an optoelectronic fusion integrated device and method based on an optical waveguide silicon-based optical phased array, which solves the problem that the existing space laser communication system is difficult to achieve high integration, lightweight and software reconfigurability.

[0006] To achieve the above-mentioned purpose, the present invention provides an optoelectronic fusion integrated device for optical waveguide silicon-based optical phased array, including an FPGA comprehensive processing module, a laser driver, a laser generator, an OPA antenna, an OPA driving circuit, a CCD / CMOS sensor, a CCD / CMOS control circuit, a signal amplifier and a DDR3 memory chip, wherein the above-mentioned units are integrated on the same PCB board, the FPGA comprehensive processing module is respectively connected to the OPA driving circuit, the DDR3 memory chip, the laser driver, the signal amplifier and the CCD / CMOS control circuit, the laser generator is connected to the laser driver, the OPA antenna is respectively connected to the laser generator and the OPA driving circuit, and the CCD / CMOS sensor is respectively connected to the signal amplifier and the CCD / CMOS control circuit;

[0007] The FPGA comprehensive processing module is used for signal processing, including signal modulation and demodulation, signal scrambling and descrambling, signal serial-to-parallel conversion and communication bit error rate monitoring, image processing, including spot image acquisition, spot image caching, image grayscale processing and spot centroid detection, optical phased array beam pointing control, and software customization and reconstruction according to engineering requirements;

[0008] The OPA driving circuit is used to receive the OPA antenna phase modulation voltage sent by the FPGA integrated processing module, and send it to the OPA antenna phase shifter array to control the OPA antenna to deflect the outgoing signal beam to a preset position;

[0009] The OPA antenna is used to emit a signal beam and deflect it to a preset position, and is combined with an OPA driving circuit to realize the direction control of the signal beam;

[0010] The laser driver is used to receive the laser modulation signal sent by the FPGA comprehensive processing module and control the laser generator to generate a corresponding signal light beam;

[0011] The laser generator is used to generate a seed laser source and is combined with the laser driver to generate a modulated signal light beam;

[0012] The CCD / CMOS sensor is used to receive the signal beam, collect the signal beam spot image and convert it into an electrical signal;

[0013] The signal amplifier is used to amplify the electrical signal received from the CCD / CMOS sensor and transmit it to the FPGA integrated processing module;

[0014] The CCD / CMOS control circuit is used to transmit the control signal sent by the FPGA integrated processing module to the CCD / CMOS sensor to control the exposure time, gray value threshold and related parameters and working state thereof;

[0015] The DDR3 memory chip is used to cache the CCD / CMOS image signal collected by the FPGA comprehensive processing module, cache the real-time data stream and feed it back to the FPGA comprehensive processing module in the form of a complete picture.

[0016] Wherein, the optoelectronic fusion integrated device based on optical waveguide silicon-based optical phased array further includes a user interface, and the user interface is connected to the FPGA comprehensive processing module;

[0017] The user interface is used to provide a data exchange interface to transmit user data to the FPGA comprehensive processing module.

[0018] Wherein, the optoelectronic fusion integrated device based on optical waveguide silicon-based optical phased array also includes a power supply interface;

[0019] The power interface is used to process the input voltage, convert it into the rated working voltage of each device, and input it into each device through the PCB printed circuit.

[0020] Wherein, the FPGA comprehensive processing module includes a signal processing unit and an image processing unit;

[0021] The signal processing unit is used to perform modulation and demodulation, code decoding, frame matching, and serial-to-parallel conversion on the received and transmitted signals, and to monitor the communication bit error rate in real time during the communication process;

[0022] The image processing unit is used to collect the spot image of the CCD / CMOS sensor, perform image caching, image grayscale processing and spot centroid detection operations on the collected signal light beam spot image, and extract the modulation signal of the received signal light beam according to the FPGA timing signal and the corresponding spot image characteristics.

[0023] Wherein, the FPGA integrated processing module also includes a laser driving control unit and an OPA beam pointing control unit;

[0024] The laser drive control unit is used to send the laser modulation signal to the laser driver, and control the laser generator to generate a corresponding signal light beam through the laser driver; the OPA beam pointing control unit is used to send the phase modulation voltage of each channel of the phase shifter array in the OPA antenna through the OPA drive circuit to the OPA antenna phase shifter array, and control the OPA antenna to deflect the outgoing signal light beam to a preset position.

[0025] The optoelectronic fusion integration method based on optical waveguide silicon-based optical phased array includes the following steps:

[0026] Initialization: perform phase calibration on each channel of the optical phased array and initialize each module;

[0027] Alignment: The FPGA integrated processing module transmits the preset communication terminal position coordinates to the OPA beam pointing control unit. The OPA beam pointing control unit sends the phase modulation voltage of each channel of the phase shifter array in the OPA antenna to the OPA antenna phase shifter array through the OPA driving circuit, and controls the OPA antenna to deflect the outgoing signal beam to the preset communication terminal position, so that the signal beam enters the preset communication terminal. The preset communication terminal receives the signal beam emitted by the local device, and the signal beam it emits is also received by the CCD / CMOS sensor of the local device, and the optical link is aligned.

[0028] Signal transmission: The transmission signal is transmitted to the signal processing unit through the user interface. After encoding, de-coding, framing, and serial-to-parallel conversion, the laser modulation signal is generated and sent to the laser driver. The laser driver controls the laser generator to generate the corresponding signal beam. The signal beam passes through the OPA antenna and then is emitted to the preset communication terminal position.

[0029] Signal reception: The CCD / CMOS sensor collects the spot image of the signal beam and transmits it to the image processing unit. The image processing unit performs image caching, image grayscale processing, and spot centroid detection on the collected spot image. The CCD / CMOS control circuit adjusts the relevant parameters of the CCD / CMOS sensor, and extracts the modulation signal of the received signal beam according to the FPGA timing signal and the corresponding spot image characteristics. The signal processing unit performs serial-to-parallel conversion, frame matching, decoding and descrambling operations on the extracted modulated signal, restores the received signal, and outputs it through the user interface.

[0030] The present invention discloses an optoelectronic fusion integrated device and method based on an optical waveguide silicon-based optical phased array, comprising an interconnected FPGA integrated processing module, a laser driver, a laser generator, an OPA antenna, an OPA driving circuit, a CCD / CMOS sensor, a CCD / CMOS control circuit, a signal amplifier, a DDR3 memory chip, a user signal interface, and a power module. The above units are all integrated on the same PCB board, and functions such as signal transmission, signal reception, signal beam pointing, signal processing, and image processing of a space laser communication system are realized on an optoelectronic integrated device. The device has a very high degree of integration, can realize an integrated design of receiving and transmitting space optical signals, does not require an additional mechanical turntable structure, and has the advantages of miniaturization and lightweight compared with traditional space laser communication equipment. The device uses an FPGA software module to realize functions such as modulation and demodulation of signal light, OPA antenna driving, and camera image processing. The device has extremely strong flexibility, and related software can be customized or reconstructed according to actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0032] Figure 1 It is a schematic structural diagram of an optoelectronic fusion integrated device based on an optical waveguide silicon-based optical phased array according to the first embodiment of the present invention.

[0033] Figure 2 It is a communication transceiver flow chart of the optoelectronic fusion integrated device based on the optical waveguide silicon-based optical phased array according to the first embodiment of the present invention.

[0034] Figure 3 It is a flowchart of the steps of the optoelectronic fusion integration method based on optical waveguide silicon-based optical phased array according to the second embodiment of the present invention.

[0035] In the figure: 101-FPGA integrated processing module, 102-laser driver, 103-laser generator, 104-OPA antenna, 105-OPA driving circuit, 106-CCD / CMOS sensor, 107-CCD / CMOS control circuit, 108-signal amplifier, 109-DDR3 memory chip, 110-user interface, 111-power interface. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0037] The first embodiment of the present application is:

[0038] See also Figure 1 and Figure 2 ,in, Figure 1 It is a schematic structural diagram of an optoelectronic fusion integrated device based on an optical waveguide silicon-based optical phased array according to the first embodiment of the present invention. Figure 2 It is a communication transceiver flow chart of the optoelectronic fusion integrated device based on the optical waveguide silicon-based optical phased array according to the first embodiment of the present invention.

[0039] The present invention provides an optoelectronic fusion integrated device based on an optical waveguide silicon-based optical phased array, comprising an FPGA integrated processing module 101, a laser driver 102, a laser generator 103, an OPA antenna 104, an OPA driving circuit 105, a CCD / CMOS sensor 106, a CCD / CMOS control circuit 107, a signal amplifier 108, a DDR3 memory chip 109, a user interface 110 and a power interface 111. The FPGA integrated processing module 101 comprises a signal processing unit, an image processing unit, a laser driving control unit and an OPA beam pointing control unit.

[0040] For this specific implementation, the FPGA integrated processing module 101 is respectively connected to the OPA driving circuit 105, the DDR3 memory chip 109, the laser driver 102, the signal amplifier 108 and the CCD / CMOS control circuit 107, the laser generator 103 is connected to the laser driver 102, the OPA antenna 104 is respectively connected to the laser generator 103 and the OPA driving circuit 105, and the CCD / CMOS sensor 106 is respectively connected to the signal amplifier 108 and the CCD / CMOS control circuit 107;

[0041] The FPGA integrated processing module 101 is used for signal modulation and demodulation, scrambling and descrambling, serial-to-parallel conversion, communication bit error rate monitoring, spot image acquisition, spot image caching, spot centroid detection, image grayscale processing, exposure threshold setting, laser modulation signal output and the pointing control of the signal beam emitted by the OPA antenna 104, and the software can be customized and reconstructed according to engineering requirements;

[0042] The OPA driving circuit 105 is used to receive the OPA antenna phase modulation voltage sent by the FPGA integrated processing module 101, and send it to the phase shifter array of the OPA antenna 104, so as to control the OPA antenna to deflect the outgoing signal beam to a preset position;

[0043] The OPA antenna 104 is used to transmit a signal beam and deflect it to a preset position, and realize the direction control of the signal beam in combination with the OPA driving circuit;

[0044] The laser driver 102 is used to receive the laser modulation signal sent by the FPGA integrated processing module and control the laser generator 103 to generate a corresponding signal beam;

[0045] The laser generator 103 is used to generate a seed laser source, and can generate a modulated signal beam in combination with a laser driver;

[0046] The CCD / CMOS sensor 106 is used to receive the signal beam, collect the signal beam spot image and convert it into an electrical signal;

[0047] The signal amplifier 108 is used to amplify the electrical signal received from the CCD / CMOS sensor 106 and transmit it to the FPGA integrated processing module 101;

[0048] The CCD / CMOS control circuit 107 is used to transmit the control signal sent by the FPGA integrated processing module to the CCD / CMOS sensor 106 to control its exposure time, gray value threshold and other related parameters and working status;

[0049] The DDR3 memory chip 109 is used to cache the CCD / CMOS image signal collected by the FPGA integrated processing module 101, cache the real-time data stream and feed it back to the FPGA integrated processing module 101 in the form of a complete picture.

[0050] The OPA antenna 104 is provided with an interconnected optical signal coupler, an optical power distribution array, a phase shifter array, and an optical antenna array. The signal light generated by the laser generator 103 enters the optical power distribution array through the optical signal coupler. The optical power distribution array realizes equal power and equal optical path distribution of the input light, ensuring that the phase of the optical signal in each channel is consistent. The phase shifter array receives the phase modulation voltage of the OPA driving circuit 105, and phase modulates the optical signal of each channel respectively. The light in each channel is emitted into space through the optical antenna array, combined in space and pointed to the target point. By changing the phase of the optical signal of each channel, the emission angle of the light beam formed after the combination can be changed, thereby realizing the deflection or scanning of the signal beam in space. The OPA driving circuit 105 receives the OPA antenna phase modulation voltage issued by the OPA beam pointing control unit in the FPGA integrated processing module 101, and sends it to the phase shifter array in the OPA antenna 104, controlling the OPA antenna to deflect the emitted signal beam to a preset position. The DDR3 memory chip 109 is responsible for caching the CCD / CMOS image signal collected by the FPGA integrated processing module 101, caching the real-time data stream and feeding it back to the image processing unit in the FPGA integrated processing module 101 in the form of a complete picture, and performing image grayscale processing, light spot centroid detection, modulation signal extraction and other processing.

[0051] The signal processing unit is used to perform modulation and demodulation, code decoding, inter-frame matching, serial-to-parallel conversion and other processing on the transmitted and received signals, and monitor the communication bit error rate in real time during the communication process;

[0052] The image processing unit is used to collect the spot image of the CCD / CMOS sensor, perform image caching, image grayscale processing and spot centroid detection on the collected signal light beam spot image, and extract the modulation signal of the received signal light beam according to the FPGA timing signal and the corresponding spot image characteristics.

[0053] The laser driving control unit is used to send the laser modulation signal to the laser driver 102, control the laser generator 103 to generate a corresponding signal beam, and emit it through the OPA antenna 104;

[0054] The OPA beam pointing control unit is used to send the phase modulation voltage of each channel of the phase shifter array in the OPA antenna 104 to the OPA antenna phase shifter array through the OPA driving circuit 105, and control the OPA antenna to deflect the outgoing signal beam to a preset position.

[0055] The FPGA integrated processing module 101 includes the signal processing unit, the image processing unit, the laser driving control unit, and the OPA beam pointing control unit. Among them, the signal processing unit can perform modulation and demodulation, code decoding, frame matching, serial-to-parallel conversion and other processing on the received and transmitted signals, and monitor the communication bit error rate in real time during the communication process; the image processing unit caches the real-time data stream collected by the CCD / CMOS sensor, obtains a complete spot image, and extracts the modulation signal of the signal beam according to the FPGA timing signal and the corresponding spot image feature, detects the current light signal intensity information, and adjusts the camera's exposure time, gray value threshold and other parameters according to the current light intensity information; the laser drive control unit sends the laser modulation signal to the laser driver 102, and the laser driver 102 controls the laser generator 103 to generate the corresponding signal beam, which is emitted through the OPA antenna 104; the OPA pointing control unit receives the preset position pointing information, and sends the phase modulation voltage of each channel of the phase shifter array in the OPA antenna 104 to the phase shifter array in the OPA antenna 104 through the OPA drive circuit 105, so as to realize the optical phase control of each channel of the OPA antenna phase shifter array, thereby achieving the purpose of controlling the deflection or scanning of the signal beam.

[0056] Secondly, the user interface 110 is connected to the FPGA comprehensive processing module 101;

[0057] The user interface 110 is used to provide a data exchange interface to transmit user data to the FPGA integrated processing module 101. The user interface 110 uses an RS422 data transmission interface to transmit user data to the FPGA integrated processing module 101 in a full-duplex differential transmission manner.

[0058] At the same time, the power interface 111 is used for voltage division and overcurrent protection. It converts the input voltage into the rated working voltage of each device, inputs it into each device through the PCB printed circuit, and disconnects the circuit in time when an abnormal situation such as a short circuit occurs in the circuit to protect each device from being burned by excessive current.

[0059] An optoelectronic fusion integrated device based on an optical waveguide silicon-based optical phased array using this embodiment includes the interconnected FPGA integrated processing module 101, the 1550nm band laser generator 103, the laser driver 102, the silicon-based optical waveguide OPA antenna 104 based on the thermo-optical effect, the OPA driving circuit 105, the CMOS sensor 106, the CMOS control circuit 107, the signal amplifier 108, the DDR3 memory chip 109, the user interface 110 supporting the RS422 protocol, and the power interface 111, wherein:

[0060] The FPGA integrated processing module 101 includes the signal processing unit, the image processing unit, the laser driving control unit, and the OPA beam pointing control unit that can exchange data with each other. Among them, the signal processing unit can perform modulation and demodulation, code decoding, frame matching, serial-to-parallel conversion and other processing on the received and transmitted signals, and monitor the communication bit error rate in real time during the communication process; the image processing unit performs data caching on the data collected by the CMOS sensor, returns the complete spot image from the DDR3 storage chip, extracts the modulation signal of the signal light beam according to the FPGA timing signal and the corresponding spot image characteristics, detects the current light signal intensity information, and adjusts the camera's exposure time, grayscale threshold and other parameters according to the current light intensity information; the laser drive control unit can control the laser driver 102 and the laser generator 103 to convert the input electrical signal into an optical signal, which is emitted through the OPA antenna 104; the OPA beam pointing control unit sends the modulation voltage of each channel of the phase shifter array in the OPA antenna 104 to the phase shifter array in the OPA antenna 104 through the OPA drive circuit 105, realizes the optical phase control of each channel of the OPA antenna, and thus controls the deflection or scanning of the signal beam. The silicon-based optical waveguide optical phased array antenna based on the thermo-optic effect is provided with an interconnected optical signal coupler, an optical power distribution array, a phase shifter array, and an optical antenna array. The optical signal coupler couples the signal light of the 1550nm band into the chip. The optical power distribution array realizes equal power and equal optical path distribution of the input light to ensure the consistency of the phase of the optical signal in each channel. The phase shifter array is based on the principle of thermo-optic effect. By applying different voltages to the phase shifter array, the phase modulation of the signal light of each channel is realized. Finally, the light in each channel is emitted into space through the optical antenna array and combined in space. The signal processing unit of the FPGA comprehensive processing module 101 is designed with a communication rate of 10Mbps. The laser driver 102 adopts the IM / DD (intensity modulation / direct detection) communication system and adopts the modulation mode of on-off keying OOK (OOK) to drive and control the 1550nm band laser generator 103.

[0061] The user interface 110 uses an RS422 data transmission interface to transmit user data to the FPGA integrated processing module 101 in a full-duplex differential transmission mode.

[0062] The signal transmission process is as follows: the RS422 protocol user interface 110 receives the user input electrical signal and transmits it to the signal processing unit in the FPGA integrated processing module 101. After signal encoding, decodification, framing, serial-to-parallel conversion and other operations, a laser modulation signal is generated and sent to the laser driver 102. The laser driver 102 controls the 1550nm band laser 103 to generate signal light, and the signal light passes through the OPA antenna 104 and then is emitted to a preset position in space.

[0063] The signal receiving process is as follows: the CMOS sensor 107 receives the incident light signal beam in the 1550nm band, collects the signal beam spot image data, and transmits it to the image processing unit of the FPGA integrated processing module 101 after passing through the signal amplifier 108. The image processing unit performs image caching, image grayscale processing, and spot centroid detection on the collected spot image, extracts the modulation signal of the received signal beam according to the FPGA timing signal and the corresponding spot image feature, and transmits the extracted modulation signal to the signal processing unit in the FPGA integrated processing module 101. The signal processing unit performs serial-to-parallel conversion, frame matching, decoding and descrambling on the extracted modulation signal, restores the received signal and outputs it through the RS422 protocol user interface 110.

[0064] The image processing process is as follows: the CMOS sensor 107 collects the spot image, converts it into an electrical signal, and transmits it to the image processing unit in the FPGA integrated processing module 101 after passing through the signal amplifier 108; the image processing unit caches the real-time data stream through the DDR3 storage chip 109 and reads out the complete spot image, and performs image grayscale processing, spot centroid detection, spot light intensity detection, modulation signal extraction and other processing on the spot image data to obtain relevant information such as the spot position and light intensity and the modulation signal; and adjusts the CMOS sensor exposure time, grayscale value threshold and other related parameters according to the light intensity information feedback.

[0065] The present invention realizes functions such as signal transmission, signal reception, signal beam pointing, signal processing, image processing, etc. of a space laser communication system on an optoelectronic integrated device, and has an extremely high degree of integration.

[0066] The present invention can realize the integrated design of transmitting and receiving space optical signals without the need for an additional mechanical turntable structure, and has the advantages of miniaturization and lightness compared with traditional space laser communication equipment.

[0067] The present invention uses FPGA software modules to implement functions such as modulation and demodulation of signal light, OPA antenna driving, and camera image processing. It has extremely strong flexibility, and related software can be customized or reconstructed according to actual needs.

[0068] The second embodiment of the present application is:

[0069] Based on the first embodiment, please refer to Figure 3 ,in, Figure 3 It is a flowchart of the steps of the optoelectronic fusion integration method based on optical waveguide silicon-based optical phased array according to the second embodiment of the present invention.

[0070] The optoelectronic fusion integration method based on the optical waveguide silicon-based optical phased array of this embodiment includes the following steps:

[0071] S201: Perform phase calibration on each channel of the optical phased array and initialize each module;

[0072] S202: The FPGA integrated processing module 101 transmits the preset communication terminal position coordinates to the OPA beam pointing control unit, and the OPA pointing control unit sends the corresponding phase modulation voltage to the phase shifter array of the OPA antenna 104 through the OPA driving circuit 105, so that the signal beam points to the preset communication terminal position;

[0073] S203: The CCD / CMOS sensor 106 collects the signal beam spot image and transmits it to the image processing unit of the FPGA integrated processing module 101. The image processing unit caches the real-time image data stream through the DDR3 storage chip 109 and reads out the complete spot image. The spot image data is processed by image grayscale processing, spot centroid detection, spot light intensity detection and other processing to obtain relevant information such as spot position and light intensity. The CCD / CMOS control circuit 107 adjusts the CCD / CMOS sensor 106 exposure time, grayscale value threshold and other related parameters, and extracts the modulation signal of the received signal beam according to the FPGA timing signal and the corresponding spot image feature; S204: The transmission signal is transmitted to the signal processing unit of the FPGA integrated processing module 101 through the user interface 110, and after signal encoding and decoding, the signal is sent to the signal processing unit of the FPGA integrated processing module 101. , framing, serial-to-parallel conversion and other operations to generate a laser modulation signal and send it to the laser driver 102. The laser driver 102 controls the laser generator 103 to generate a signal light beam. The signal light beam passes through the OPA antenna 104 and then is emitted to the preset communication terminal position. The received signal light beam is collected by the CCD / CMOS sensor 106, and is transmitted to the image processing unit of the FPGA integrated processing module 101 after passing through the signal amplifier 108. The image processing unit performs image caching, image grayscale processing and spot centroid detection on the collected light spot image. The modulation signal of the received signal light beam is extracted according to the FPGA timing signal and the corresponding light spot image feature and input into the signal processing unit. The signal processing unit performs operations such as signal serial-to-parallel conversion, frame matching, decoding and descrambling on it, and restores the received signal and outputs it through the user interface 110.

[0074] Specifically, step 1: optical phased array phase calibration and initialization: before starting, phase calibration is performed on each channel of the optical phased array to reduce the beam pointing error introduced by the phased array antenna. At startup, each module is initialized, the preset program and parameters are loaded into the FPGA integrated processing module 101, and each register is assigned an initial value. Step 2: optical phased array beam pointing: the FPGA integrated processing module 101 transmits the preset communication terminal position coordinates to the OPA pointing control unit, and the OPA pointing control unit sends the corresponding phase modulation voltage to the optical phased array antenna through the OPA driving circuit 105, so that the beam points to the preset communication terminal position. Step 3: signal light reception and image processing: the CCD / CMOS sensor 106 receives the signal light spot image and transmits it to the image processing unit in the FPGA integrated processing module 101. The image processing unit reads out the image after caching three frames through the DDR3 memory chip 109, and adjusts the CCD / CMOS exposure time, window size and other related parameters through the CCD / CMOS control circuit 107 to prevent the light spot from being overexposed and affecting the communication quality. Step 4: Establishing a communication link: The transmitted electrical signal is transmitted to the signal processing unit in the FPGA integrated processing module 101 through the user interface 110, and is sent to the laser driver 102 after signal modulation processing. The laser driver 102 controls the laser to generate signal light. The signal light passes through the OPA antenna 104 and is emitted to the preset communication terminal position. The received signal light is converted into an electrical signal by the CCD / CMOS sensor 106, and is transmitted to the signal processing unit in the FPGA integrated processing module 101 after passing through the signal amplifier 108 and the analog-to-digital converter. The signal processing unit performs signal demodulation processing on it and outputs it through the user signal interface. Both the transmitting end and the receiving end receive the opposite end signal, and synchronization is achieved after signal processing such as decoding, modulation and demodulation, and the communication link is established.

[0075] The present invention realizes functions such as signal transmission, signal reception, signal beam pointing, signal processing, image processing, etc. of a space laser communication system on an optoelectronic integrated device, and has an extremely high degree of integration.

[0076] The present invention can realize the integrated design of transmitting and receiving space optical signals without the need for an additional mechanical turntable structure, and has the advantages of miniaturization and lightness compared with traditional space laser communication equipment.

[0077] The present invention uses FPGA software modules to implement functions such as modulation and demodulation of signal light, OPA antenna driving, and camera image processing. It has extremely strong flexibility, and related software can be customized or reconstructed according to actual needs.

[0078] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An optoelectronic fusion integrated device based on an optical waveguide silicon-based optical phased array, characterized in that: It includes an FPGA integrated processing module, a laser driver, a laser generator, an OPA antenna, an OPA driving circuit, a CCD / CMOS sensor, a CCD / CMOS control circuit, a signal amplifier and a DDR3 memory chip. The above units are all integrated on the same PCB board. The FPGA integrated processing module is respectively connected to the OPA driving circuit, the DDR3 memory chip, the laser driver, the signal amplifier and the CCD / CMOS control circuit, the laser generator is connected to the laser driver, the OPA antenna is respectively connected to the laser generator and the OPA driving circuit, and the CCD / CMOS sensor is respectively connected to the signal amplifier and the CCD / CMOS control circuit; The FPGA comprehensive processing module is used for signal processing, including signal modulation and demodulation, signal scrambling and descrambling, signal serial-to-parallel conversion and communication bit error rate monitoring, image processing, including spot image acquisition, spot image caching, image grayscale processing and spot centroid detection, optical phased array beam pointing control, and software customization and reconstruction according to engineering requirements; The OPA driving circuit is used to receive the OPA antenna phase modulation voltage sent by the FPGA integrated processing module, and send it to the OPA antenna phase shifter array to control the OPA antenna to deflect the outgoing signal beam to a preset position; The OPA antenna is used to emit a signal beam and deflect it to a preset position, and is combined with an OPA driving circuit to realize the direction control of the signal beam; The laser driver is used to receive the laser modulation signal sent by the FPGA comprehensive processing module and control the laser generator to generate a corresponding signal light beam; The laser generator is used to generate a seed laser source and is combined with the laser driver to generate a modulated signal light beam; The CCD / CMOS sensor is used to receive the signal beam, collect the signal beam spot image and convert it into an electrical signal; The signal amplifier is used to amplify the electrical signal received from the CCD / CMOS sensor and transmit it to the FPGA integrated processing module; The CCD / CMOS control circuit is used to transmit the control signal sent by the FPGA integrated processing module to the CCD / CMOS sensor to control the exposure time, gray value threshold and related parameters and working state thereof; The DDR3 memory chip is used to cache the CCD / CMOS image signal collected by the FPGA comprehensive processing module, cache the real-time data stream and feed it back to the FPGA comprehensive processing module in the form of a complete picture.

2. The optoelectronic fusion integrated device based on optical waveguide silicon-based optical phased array according to claim 1, characterized in that: The optoelectronic fusion integrated device based on the optical waveguide silicon-based optical phased array further includes a user interface, which is connected to the FPGA comprehensive processing module; The user interface is used to provide a data exchange interface to transmit user data to the FPGA comprehensive processing module.

3. The optoelectronic fusion integrated device based on optical waveguide silicon-based optical phased array according to claim 2, characterized in that: The optoelectronic fusion integrated device based on the optical waveguide silicon-based optical phased array also includes a power supply interface; The power interface is used to process the input voltage, convert it into the rated working voltage of each device, and input it into each device through the PCB printed circuit.

4. The optoelectronic fusion integrated device based on optical waveguide silicon-based optical phased array according to claim 1, characterized in that: The FPGA comprehensive processing module includes a signal processing unit and an image processing unit; The signal processing unit is used to perform modulation and demodulation, code decoding, frame matching, and serial-to-parallel conversion on the received and transmitted signals, and to monitor the communication bit error rate in real time during the communication process; The image processing unit is used to collect the spot image of the CCD / CMOS sensor, perform image caching, image grayscale processing and spot centroid detection operations on the collected signal light beam spot image, and extract the modulation signal of the received signal light beam according to the FPGA timing signal and the corresponding spot image characteristics.

5. The optoelectronic fusion integrated device based on optical waveguide silicon-based optical phased array according to claim 4, characterized in that: The FPGA integrated processing module also includes a laser driving control unit and an OPA beam pointing control unit; The laser drive control unit is used to send the laser modulation signal to the laser driver, and control the laser generator to generate a corresponding signal light beam through the laser driver; the OPA beam pointing control unit is used to send the phase modulation voltage of each channel of the phase shifter array in the OPA antenna through the OPA drive circuit to the OPA antenna phase shifter array, and control the OPA antenna to deflect the outgoing signal light beam to a preset position.

6. The optoelectronic fusion integration method based on optical waveguide silicon-based optical phased array is applicable to the optoelectronic fusion integrated device based on optical waveguide silicon-based optical phased array as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Initialization: perform phase calibration on each channel of the optical phased array and initialize each module; Alignment: The FPGA integrated processing module transmits the preset communication terminal position coordinates to the OPA beam pointing control unit. The OPA beam pointing control unit sends the phase modulation voltage of each channel of the phase shifter array in the OPA antenna to the OPA antenna phase shifter array through the OPA driving circuit, and controls the OPA antenna to deflect the outgoing signal beam to the preset communication terminal position, so that the signal beam enters the preset communication terminal. The preset communication terminal receives the signal beam emitted by the local device, and the signal beam it emits is also received by the CCD / CMOS sensor of the local device, and the optical link is aligned. Signal transmission: The transmission signal is transmitted to the signal processing unit through the user interface. After encoding, de-coding, framing, and serial-to-parallel conversion, the laser modulation signal is generated and sent to the laser driver. The laser driver controls the laser generator to generate the corresponding signal beam. The signal beam passes through the OPA antenna and then is emitted to the preset communication terminal position. Signal reception: The CCD / CMOS sensor collects the spot image of the signal beam and transmits it to the image processing unit. The image processing unit performs image caching, image grayscale processing, and spot centroid detection on the collected spot image. The CCD / CMOS control circuit adjusts the relevant parameters of the CCD / CMOS sensor, and extracts the modulation signal of the received signal beam according to the FPGA timing signal and the corresponding spot image characteristics. The signal processing unit performs serial-to-parallel conversion, frame matching, decoding and descrambling operations on the extracted modulated signal, restores the received signal, and outputs it through the user interface.

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