Highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions

Abstract

The invention discloses a highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions, belonging to the field of wireless high-speed laser communication technology. In order to solve the problems of small error tolerance range and low reliability of beam alignment in the existing multi-channel data fusion, the system comprises: a payload data source array 1, a data fusion FPGA 1, a microwave amplifier 1, a narrow linewidth laser 1, an electro-optic modulator 1, a narrow linewidth laser N, an electro-optic modulator N, a microwave amplifier N, a data fusion FPGA N, a payload data source array N, a coarse wavelength division multiplexer, a transmitting antenna, a receiving antenna, a coarse wavelength division multiplexer, a high-speed photoelectric detector 1, a high-speed photoelectric detector N, a data decomposition and fusion FPGA 1 and a data decomposition and fusion FPGA N; FGPA and coarse wavelength division multiplexing are used to complete multi-channel data fusion and modulation, which is suitable for light and small high-speed real-time transmission of a large number of payload data sources; a coarse wavelength division multiplexer combined with multi-mode optical fiber and a transmitting and receiving antenna with multi-mode optical fiber as a pigtail are used, and the transmitting antenna and the receiving antenna have a large alignment range.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless high-speed laser communication, and in particular to a high-reliability short-distance ultra-high-speed space laser communication system under dynamic rotating conditions. Background Art

[0002] In recent years, the strategic position of aerospace has become increasingly important, and human exploration of the universe has increased day by day. Space cameras with high temporal and spatial resolution for space-based and ground-based targets have become a hot topic in the field of modern optical observation. Due to the high spectral and high spatial resolution of existing space cameras and other payloads, the payload will generate a large number of high-pixel images or high-definition videos per unit time. For this reason, there is an urgent need for real-time transmission of massive data in the payload cabin (hundreds of gigabits per second, or even higher). At the same time, existing space payloads often have multiple payloads working together, and adapting to multi-payload data transmission is also one of the development trends. At present, the bandwidth of microwave communication cannot meet the communication requirements of such ultra-high speed. Optical communication has become a better choice due to its advantages such as high communication rate, small size and light weight. However, there will be a random rotation alignment state between the platform cabin and the payload cabin, so the use of optical fiber communication is greatly restricted. Compared with optical fiber communication, wireless optical communication uses free space as a channel and uses optical antennas to transmit and receive light beams. At the same time, wireless optical communication can easily meet the requirements of multi-payload data transmission.

[0003] The Chinese patent publication number "CN201710361776.X" discloses "an intra-satellite ultra-high-speed data laser transmission system", which includes a laser modulation module and a laser demodulation module, which modulate electrical signals into optical signals and demodulate optical signals into electrical signals respectively, and both use intensity modulation and wavelength division multiplexing technology to achieve high-speed communication transmission of 210Gbps to 280Gbps. However, the system has a single spatial channel, and the beam alignment tolerance range is small for random rotation alignment states. Summary of the invention

[0004] In order to solve the problems of small error tolerance range and low reliability of light beam alignment in the existing multi-channel data fusion situation, the present invention proposes a highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions.

[0005] The technical solution of the present invention to solve the technical problem is:

[0006] A highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions, characterized in that the system comprises: a payload data source array 1, a data fusion FPGA 1, a microwave amplifier 1, a narrow linewidth laser 1, an electro-optic modulator 1, a narrow linewidth laser N, an electro-optic modulator N, a microwave amplifier N, a data fusion FPGA N, a payload data source array N, a coarse wavelength division multiplexer, a transmitting antenna, a receiving antenna, a coarse demultiplexing wavelength division multiplexer, a high-speed photodetector 1, a high-speed photodetector N, a data demultiplexing FPGA 1 and a data demultiplexing FPGA N;

[0007] The single-mode optical fiber of the load data modulator is fused with the multi-mode optical fiber of the coarse wavelength division multiplexer; the connection mode of multiple groups of structures is the same as above; the data source array N of the same load is connected to the data fusion FPGA N in sequence through cables, and the data fusion FPGA N, microwave amplifier N, and electro-optic modulator N are connected in sequence through circuits; the narrow linewidth laser N is connected to the electro-optic modulator N optical fiber; the single-mode optical fiber of the electro-optic modulator N is fused with the multi-mode optical fiber of the coarse wavelength division multiplexer;

[0008] The coarse wavelength division multiplexer pigtail is located on the focal plane of the transmitting antenna, the transmitting antenna is spatially aligned with the receiving antenna, and the optical fiber at the input end of the coarse wavelength division multiplexer is located on the focal plane of the receiving antenna; the output optical fiber of the coarse wavelength division multiplexer is respectively connected to the high-speed photodetector 1 and the high-speed photodetector N; and the high-speed photodetector 1 is connected to the data decomposition and fusion FPGA 1 by cable, and the high-speed photodetector N is connected to the data decomposition and fusion FPGA N by cable.

[0009] The beneficial effects of the present invention are:

[0010] 1) FPGA and coarse wavelength division multiplexing are used to complete multi-channel data fusion and modulation, which is suitable for lightweight, high-speed and real-time transmission of a large number of load data sources;

[0011] 2) A coarse wavelength division multiplexer combined with multimode optical fiber and a transmitting and receiving antenna with multimode optical fiber as the pigtail are used. The core of the multimode optical fiber is ≥62.5μm, the numerical aperture is ≥0.22, the alignment range of the transmitting antenna and the receiving antenna is large, and the tolerance requirements are loose, which is suitable for random rotation alignment between the platform cabin and the payload cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The invention provides a highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below with reference to the accompanying drawings.

[0014] like Figure 1As shown, a highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions is provided, which includes: a payload data source array-1, a data fusion FPGA-2, a microwave amplifier-4, a narrow linewidth laser-3, an electro-optic modulator-5, a narrow linewidth laser N6, an electro-optic modulator N7, a microwave amplifier N8, a data fusion FPGAN9, a payload data source array N10, a coarse wavelength division multiplexer 11, a transmitting antenna 12, a receiving antenna 13, a coarse demultiplexing wavelength division multiplexer 14, a high-speed photodetector-15, a high-speed photodetector N16, a data demultiplexing FPGA-17, and a data demultiplexing FPGA N18.

[0015] The payload data source array 1 is connected to the data fusion FPGA 2 in sequence through cables, and the data fusion FPGA 2, microwave amplifier 4, and electro-optic modulator 5 are connected in sequence through circuits. The narrow linewidth laser 3 is connected to the electro-optic modulator 5 optical fiber, and the electro-optic modulator 5 single-mode optical fiber is fused with the coarse wavelength division multiplexer 11 multi-mode optical fiber. The connection method of multiple groups of structures is the same as above. Similarly, the payload data source array N10 is connected to the data fusion FPGA N9 in sequence through cables, and the data fusion FPGA N9, microwave amplifier N8, and electro-optic modulator N7 are connected in sequence through circuits. The narrow linewidth laser N6 is connected to the electro-optic modulator N7 optical fiber. The electro-optic modulator N7 single-mode optical fiber is fused with the coarse wavelength division multiplexer 11 multi-mode optical fiber.

[0016] The pigtail of the coarse wavelength division multiplexer 11 is located on the focal plane of the transmitting antenna 12, the transmitting antenna 12 is spatially aligned with the receiving antenna 13, and the input optical fiber of the coarse wavelength division multiplexer 14 is located on the focal plane of the receiving antenna 13. The output optical fiber of the coarse wavelength division multiplexer 14 is connected to the high-speed photodetector 15 and the high-speed photodetector N16 respectively. The high-speed photodetector 15 is connected to the data decomposition FPGA 17 by cable, and the high-speed photodetector N16 is connected to the data decomposition FPGA N18 by cable.

[0017] The payload data source array 1 and the payload data source array N10 are a series of data sources to be transmitted, which are divided into one to N groups.

[0018] The data fusion FPGA-2 and data fusion FPGAN9 are a series of FGPAs for high-speed data processing, used for parallel-to-serial data fusion.

[0019] The microwave amplifier 14 and the microwave amplifier N8 are a series of signal amplifiers adapted to the electro-optic modulator.

[0020] The narrow linewidth laser 13 and the narrow linewidth laser N10 are a series of narrow linewidth DFB lasers with good wavelength stability and narrow linewidth performance.

[0021] The electro-optic modulator 15 and the electro-optic modulator N7 are a series of lithium niobate electro-optic modulators, which are high-speed intensity modulators or phase modulators.

[0022] The coarse wavelength division multiplexer 11 and the coarse demultiplexer 14 are devices with multimode optical fiber as pigtails, with a small number of wavelengths for wavelength division multiplexing and demultiplexing, and the fiber core (≥62.5μm) and numerical aperture (NA≥0.22) of the optical fiber are greater than those of single-mode optical fiber.

[0023] The transmitting antenna 12 and the receiving antenna 13 are aligned space antennas for transmitting and receiving space light beams.

[0024] The high-speed photodetector 15 and the high-speed photodetector N16 belong to a series of multi-mode fiber-coupled photodetectors used for demodulating high-speed signals.

[0025] The data decomposition and fusion FPGA-17 and the data decomposition and fusion FPGAN18 are a series of FGPAs for high-speed data processing, and are used for serial-to-parallel data decomposition and fusion.

[0026] The workflow of the present invention is as follows:

[0027] like Figure 1 As shown, multiple data in the payload data source array-1 enter the data fusion FPGA-2, and the data is converted from parallel to serial. The serial data is amplified by the microwave amplifier-4 and injected into the electro-optic modulator-5. The narrow linewidth laser-3 emits a laser signal through the electro-optic modulator-5, and generates a high-speed modulated optical signal under the modulation of the injected amplified electrical signal.

[0028] The high-speed modulated optical signal generated by the fusion data and other multi-channel high-speed modulated optical signals enter the coarse wavelength division multiplexer 11 to combine into a beam. The light beam passes through the transmitting antenna 12 and the receiving antenna 13 to couple into the aligned spatial channel and enter the coarse wavelength division multiplexer 14. After the coarse wavelength division multiplexer 14, it is divided into multiple light beams. The first light beam is converted into a high-speed electrical signal through a high-speed photodetector 15. The high-speed electrical signal is injected into the data de-fusion FPGA 17 to complete the serial-to-parallel conversion, and realize the output of multiple parallel electrical signals. Other light beams also complete the serial-to-parallel conversion through the high-speed photodetector and the data de-fusion FPGA, and realize the output of multiple parallel electrical signals.

Claims

1. A highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions, characterized by: The system comprises: a payload data source array (1), a data fusion FPGA (2), a microwave amplifier (4), a narrow linewidth laser (3), an electro-optic modulator (5), a narrow linewidth laser N (6), an electro-optic modulator N (7), a microwave amplifier N (8), a data fusion FPGA N (9), a payload data source array N (10), a coarse wavelength division multiplexer (11), a transmitting antenna (12), a receiving antenna (13), a coarse demultiplexing wavelength division multiplexer (14), a high-speed photoelectric detector (15), a high-speed photoelectric detector N (16), a data demultiplexing FPGA (17) and a data demultiplexing FPGA N (18); The payload data source array 1 (1) is connected to the data fusion FPGA 1 (2) in sequence, and the data fusion FPGA 1 (2), the microwave amplifier 1 (4), and the electro-optic modulator 1 (5) are connected in sequence through circuits; the narrow linewidth laser 1 (3) is connected to the electro-optic modulator 1 (5) optical fiber, and the electro-optic modulator 1 (5) single-mode optical fiber is fused with the coarse wavelength division multiplexer (11) multi-mode optical fiber; the multiple groups of structural connection methods are the same as above; similarly, the payload data source array N (10) is connected to the data fusion FPGA N (9) in sequence through cables, and the data fusion FPGA N (9), the microwave amplifier N (8), and the electro-optic modulator N (7) are connected in sequence through circuits; the narrow linewidth laser N (6) is connected to the electro-optic modulator N (7) optical fiber; the electro-optic modulator N (7) single-mode optical fiber is fused with the coarse wavelength division multiplexer (11) multi-mode optical fiber; The pigtail of the coarse wavelength division multiplexer (11) is located on the focal plane of the transmitting antenna (12), the transmitting antenna (12) and the receiving antenna (13) are spatially aligned, and the optical fiber at the input end of the coarse wavelength division multiplexer (14) is located on the focal plane of the receiving antenna (13); the output optical fiber of the coarse wavelength division multiplexer (14) is respectively connected to a high-speed photodetector 1 (15) and a high-speed photodetector N (16); and the high-speed photodetector 1 (15) is connected to a data decomposition and fusion FPGA 1 (17) by cable, and the high-speed photodetector N (16) is connected to a data decomposition and fusion FPGA N (18) by cable.

2. The highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions according to claim 1 is characterized in that: The payload data source array 1 (1) and the payload data source array N (10) are a series of data sources to be transmitted, divided into one to N groups.

3. The highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions according to claim 1 is characterized in that: The data fusion FPGA 1 (2) and the data fusion FPGA N (9) are a series of FGPAs for high-speed data processing, used for parallel-to-serial data fusion.

4. The highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions according to claim 1 is characterized in that: The microwave amplifier 1 (4) and microwave amplifier N (8) are a series of signal amplifiers adapted to the electro-optic modulator.

5. The highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions according to claim 1 is characterized in that: The narrow linewidth laser 1 (3) and the narrow linewidth laser N (6) are a series of narrow linewidth DFB lasers with good wavelength stability and narrow linewidth performance.

6. The highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions according to claim 1 is characterized in that: The electro-optic modulator 1 (5) and electro-optic modulator N (7) are a series of lithium niobate electro-optic modulators, which are high-speed intensity modulators or phase modulators.

7. The highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions according to claim 1 is characterized in that: The coarse wavelength division multiplexer (11) and coarse demultiplexer (14) are devices with multimode optical fibers as pigtails, with a small number of wavelengths for wavelength division multiplexing and demultiplexing, and the core of the optical fiber is greater than or equal to 62.5 μm and the numerical aperture NA is greater than or equal to 0.22, which is greater than that of a single-mode optical fiber.

8. The highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions according to claim 1 is characterized in that: The high-speed photodetector 1 (15) and the high-speed photodetector N (16) are a series of multi-mode fiber-coupled photodetectors used for demodulating high-speed signals.

9. The highly reliable short-distance ultra-high-speed space laser communication system under dynamic rotation conditions according to claim 1, characterized in that: The data decomposition and fusion FPGA 1 (17) and the data decomposition and fusion FPGA N (18) are a series of FGPAs for high-speed data processing, and are used for serial-to-parallel data decomposition and fusion.

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