CN107689827A - A kind of remote sensing satellite high speed load data optical fiber coffret - Google Patents
A kind of remote sensing satellite high speed load data optical fiber coffret Download PDFInfo
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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Abstract
The invention discloses a kind of remote sensing satellite high speed load data optical fiber coffret, including：Parallel serial conversion module, optical transmission module, light delivery module, Optical Receivers and serioparallel exchange module；Wherein, parallel serial conversion module is connected with image processing circuit；Transmitting terminal high speed serial differential electric signal progress electro-optic conversion is obtained transmitting terminal optical signal by optical transmission module, and transmitting terminal optical signal is sent into light delivery module；Transmitting terminal optical signal is sent to the Optical Receivers by light delivery module；Transmitting terminal optical signal progress opto-electronic conversion is obtained receiving terminal high speed serial differential electric signal by Optical Receivers, and receiving terminal high speed serial differential electric signal is sent into serioparallel exchange module；Receiving terminal high speed serial differential electric signal is converted into receiving terminal parallel data by serioparallel exchange module, is decoded by 8b/10b, restores multidiameter delay view data, clock and gate-control signal.The present invention improves load data interface transmission rate, reduces interface transmission loss, simplifies equipment connection.
Description
Technical Field
The invention belongs to the technical field of satellite data transmission, and particularly relates to a remote sensing satellite high-speed load data optical fiber transmission interface.
Background
With the development of high-resolution remote sensing satellite load technology, the variety and the quantity of satellite-borne data information are continuously increased, and the problem of high-speed connection between massive load data and back-end data processing equipment becomes a bottleneck of remote sensing satellite design. Meanwhile, with the increase of the types of on-satellite detectors and the design requirements of light and small size of future commercial remote sensing satellites and the like, the on-satellite load equipment and the data processing equipment are required to be relatively flexible in layout relation, free of limitation on transmission distance and light in transmission medium.
The maximum rate of each path recommended by the traditional LVDS interface chip is 100Mbit/s, the maximum rate of a single path is low, and if the high-speed data transmission requirement needs to be met, the interface rate can be improved only by increasing the number of parallel paths. However, the increase of the number of parallel paths will result in a significant increase of the number of auxiliary circuits inside the device, the panel electrical connectors of the device and the transmission cables between the devices, and the size, weight and weight of the device and the cables will increase accordingly, which is not favorable for the development of the device and the integration of the system. Meanwhile, the LVDS interface adopts clock synchronization signals, and a clock and data are respectively transmitted in the transmission process, so that strict requirements are put forward on the clock code alignment relationship of the transceiver and the transmission cable for reducing the instantaneous jitter of each signal during transmission, and the constraints on equipment wiring, cable length and the like are more, which is not beneficial to the design and processing of the equipment and the cable.
In order to effectively deal with the problem of high-speed load data transmission, a load data interface based on a high-speed serial data transmission technology is gradually used in high-resolution remote sensing satellites at home and abroad. The high-speed serial data transmission interface based on TLK2711 is adopted for the first time on the high-frequency second-order satellite successfully transmitted in China, and the high-speed serial data transmission of a satellite single-path signal 2.0Gbit/s is realized. The interface transmission medium is transmitted by adopting a copper wire cable, and the downloading requirement of the whole satellite load original data rate of 6-7 Gbit/s can be met. However, as the data rate of the whole satellite load is further increased to dozens of Gbit/s or even hundreds of Gbit/s, when the transmission distance is further increased, the mutual interference of signals among the data cables is larger and larger, and the reliability of data transmission is directly influenced; secondly, the space in the satellite cabin is small in size, the emission quality is limited, and the number of transmission cables cannot be increased too much, so that the data transmission capacity is reduced; meanwhile, the satellite equipment for configuring the large remote sensing load is difficult to arrange, the distribution distance between the effective load and the rear-end data processing equipment is long, the cable moving length is increased, the transmission loss is increased, and the data transmission quality is influenced.
Disclosure of Invention
The technical problem solved by the invention is as follows: the technical scheme is that the optical fiber transmission interface for the remote sensing satellite high-speed load data is provided, the design requirements of a remote sensing satellite load data transmission system with the light and small design requirements and the long-distance, low-loss and high-speed transmission requirements are met, the transmission rate of the load data interface is further improved, the transmission loss of the interface is reduced, and the equipment connection is simplified.
The purpose of the invention is realized by the following technical scheme: an optical fiber transmission interface for remote sensing satellite high-speed load data, comprising: the optical transceiver comprises a parallel-serial conversion module, an optical transmitting module, an optical receiving module and a serial-parallel conversion module; the parallel-serial conversion module is connected with the image processing circuit and used for receiving the multi-channel parallel image data processed by the image processing circuit, performing redundancy check, 8b/10b coding and serial coding on the multi-channel parallel image data to obtain a high-speed serial differential electrical signal of the sending end, and sending the high-speed serial differential electrical signal of the sending end to the light sending module; the optical transmission module performs electric-optical conversion on the high-speed serial differential electrical signal of the transmitting end to obtain an optical signal of the transmitting end, and transmits the optical signal of the transmitting end to the optical transmission module; the optical transmission module receives an optical signal of a sending end and sends the optical signal to the optical receiving module; the optical receiving module receives the optical signal of the sending end and carries out optical-electrical conversion on the optical signal to obtain a high-speed serial differential electrical signal of the receiving end, and the high-speed serial differential electrical signal of the receiving end is sent to the serial-parallel conversion module; the serial-parallel conversion module receives the receiving end high-speed serial differential electric signal, converts the receiving end high-speed serial differential electric signal into receiving end parallel data, and restores the receiving end parallel data, the clock and the gating signal through 8b/10b decoding.
In the remote sensing satellite high-speed load data optical fiber transmission interface, the parallel-serial conversion module is an SERDES transceiver.
In the remote sensing satellite high-speed load data optical fiber transmission interface, the light sending module comprises an input interface, an encoding circuit and a light sending circuit; the input interface receives a high-speed serial differential electric signal of a sending end and sends the high-speed serial differential electric signal to the coding circuit; the coding circuit receives the high-speed serial differential electric signal of the sending end, and sends the high-speed serial differential electric signal of the sending end to the optical sending circuit after carrying out redundancy coding and scrambling on the high-speed serial differential electric signal of the sending end; and the optical transmitting circuit carries out light source modulation on the coded and scrambled high-speed serial differential electric signal of the transmitting end to obtain an optical signal of the transmitting end.
In the remote sensing satellite high-speed load data optical fiber transmission interface, the optical transmission module comprises a transmitting end optical fiber connector, an anti-radiation optical fiber and a receiving end optical fiber connector; one end of the transmitting end optical fiber connector is connected with the optical transmitting module, and the other end of the transmitting end optical fiber connector is connected with one end of the anti-radiation optical fiber; the other end of the anti-radiation optical fiber is connected with the light receiving module.
In the remote sensing satellite high-speed load data optical fiber transmission interface, the light receiving module comprises a light detector, a pre-amplification circuit, a main amplification circuit, an equalization circuit, a clock recovery circuit, a decision circuit, a code pattern inverse transformation circuit and an output interface; the optical detector converts a receiving end optical signal into an electric signal and transmits the electric signal to the pre-amplification circuit; the pre-amplification circuit amplifies the electric signal to obtain a first amplified electric signal and sends the first amplified electric signal to the main amplification circuit; the main amplifying circuit amplifies the first amplified electric signal again to obtain a second amplified electric signal and sends the second amplified electric signal to the equalizing circuit; the equalization circuit supplements and shapes the second amplified electrical signal, outputs the equalized electrical signal and sends the equalized electrical signal to the judgment circuit; the clock recovery circuit recovers a clock signal from the equalized electric signal, and the clock signal is transmitted to the decision circuit after being subjected to phase shifting; the decision circuit performs clock sampling on the equalized electric signal, compares the amplitude of the sampled signal with a decision threshold value, recovers digital signals transmitted by '0' and '1', and sends the recovered digital signals to the code pattern inverse transformation circuit; the code pattern inverse transformation circuit synchronizes, descrambles and decodes the restored digital signals to obtain code pattern inverse transformed signals, and sends the code pattern inverse transformed signals to the output interface; and the output interface converts the signals after code pattern inverse transformation into high-speed serial differential electric signals at the receiving end and sends the high-speed serial differential electric signals to the serial-parallel conversion module.
In the remote sensing satellite high-speed load data optical fiber transmission interface, the preamplifier circuit is a low-noise and broadband preamplifier.
In the remote sensing satellite high-speed load data optical fiber transmission interface, the serial-parallel conversion module is an SERDES transceiver.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention combines the high-speed serial SERDES transceiver with the optical fiber transmission, and provides the optical fiber transmission interface composition method based on the socket IO transceiver module, the single-path signal transmission rate can be increased from 2.0Gbit/s to 10Gbit/s, and the speed and the capacity of remote sensing satellite load data transmission are improved;
(2) according to the invention, the optical fiber transmission medium is used for replacing the traditional copper wire transmission medium, the current cannot be generated in the optical fiber by the self signal of the equipment and the external electromagnetic radiation, the light wave in the optical fiber is well limited in the fiber core, no leakage exists in the transmission process, the remote sensing satellite data transmission system has excellent radio frequency interference resistance and electromagnetic interference resistance, and the reliability and the safety of the remote sensing satellite data transmission system are improved;
(3) the invention has high transmission rate, and simultaneously, the optical fiber has small size and light weight, thereby greatly reducing the configuration quantity of the transceiver module, the external connector and the transmission medium in the equipment, reducing the weight and the volume of load equipment, data receiving equipment and a transmission cable, simplifying the connection relation of a satellite, saving the system cost, and being beneficial to the miniaturization, the light weight and the low-cost design of the satellite;
(4) the invention utilizes the characteristic of extremely low transmission loss of the optical fiber, and has longer supportable transmission distance compared with the traditional cable. In order to reduce the transmission loss between the remote sensing load sending equipment and the data receiving equipment, the distance between the receiving and sending equipment is generally required to be 3-5 m when cable transmission is adopted, and the limitation is not caused when optical fiber transmission is adopted (the transmission distance can reach 100km through an optical fiber interface with the transmission rate of 10 Gbit/s).
Drawings
FIG. 1 is a simplified diagram of a data transmission system to which the present invention is applicable;
FIG. 2 is a schematic block diagram of the high-speed load data optical fiber transmission interface of the remote sensing satellite according to the present invention;
FIG. 3 is a block diagram of a socket IO transceiver used in the parallel-to-serial conversion module and the serial-to-parallel conversion module of the present invention;
FIG. 4 is a schematic block diagram of an optical transmitter module according to the present invention;
FIG. 5 is a schematic block diagram of the optical transmission module according to the present invention;
fig. 6 is a schematic block diagram of the composition of the optical receiving module of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the remote sensing satellite is provided with a plurality of effective loads, the total data rate of the original data of all types of loads is about 100Gbit/s, and the original data with the rate needs to be sent to rear-end receiving equipment for data processing. As shown in fig. 1, if a traditional LVDS parallel transmission mode is adopted, since the selection limit of the LVDS interface clock frequency is 110MHz to 120MHz, assuming that a 120MHz clock frequency is adopted, the number N of transmission signal paths between the load sending device and the data receiving device needs to be 910 paths in parallel; if a TLK2711 serial transmission mode is adopted, the limit transmission rate is 2.5Gbit/s, and if a transmission mode of 125MHz of a limit reference clock and 16 bits of parallel input signals is adopted, the effective transmission rate of a single channel 2.0Gbit/s can be achieved, and N needs 50 channels of serial signals; if a socket IO transmission mode is adopted, the limit transmission rate is 10.3125Gbit/s, and if a transmission mode of 125MHz (limit clock frequency 156.3MHz) of the reference clock and 64bit of parallel input signals is adopted, the effective transmission rate of about 8.0Gbit/s can be achieved in a single channel, and N only needs 13 serial signals. The design requirements of miniaturization, light weight and low cost of the satellite are considered, and a high-speed socket IO design scheme is selected. The number of the sending modules indicated in fig. 1 is N, and the number of the receiving modules is N.
FIG. 2 is a block diagram of the high-speed load data optical fiber transmission interface of the remote sensing satellite according to the present invention. As shown in fig. 2, the remote sensing satellite high-speed load data optical fiber transmission interface includes: the optical transmitter comprises a parallel-serial conversion module 1, an optical transmitting module 2, an optical transmitting module 3, an optical receiving module 4 and a serial-parallel conversion module 5. Wherein,
the parallel-serial conversion module 1 is connected with the image processing circuit 6, and the parallel-serial conversion module 1 is configured to receive multiple paths of parallel image data processed by the image processing circuit 6, perform redundancy check, 8b/10b encoding, and serial encoding on the multiple paths of parallel image data to obtain a high-speed serial differential electrical signal at the transmitting end, and transmit the high-speed serial differential electrical signal at the transmitting end to the optical transmitting module 2.
The optical transmission module 2 performs electro-optical conversion on the high-speed serial differential electrical signal at the transmitting end to obtain an optical signal at the transmitting end, and transmits the optical signal at the transmitting end to the optical transmission module 3.
The optical transmission module 3 receives the transmitting-end optical signal and transmits it to the optical reception module 4.
The optical receiving module 4 receives the optical signal of the transmitting end and performs optical-electrical conversion on the optical signal to obtain a high-speed serial differential electrical signal of the receiving end, and the high-speed serial differential electrical signal of the receiving end is sent to the serial-to-parallel conversion module 5.
The serial-parallel conversion module 5 receives the receiving end high-speed serial differential electrical signal, converts the receiving end high-speed serial differential electrical signal into receiving end parallel data, and restores a plurality of paths of parallel image data, a clock and a gating signal through 8b/10b decoding.
Specifically, the interface block diagram corresponds to the 1-way transceiver module in fig. 1. After analog signals collected by a load sensor (such as an optical camera) are processed by A/D change and the like, multi-channel parallel data are output. The parallel-serial conversion module 1 converts the multi-path digital image data output by the optical camera, the externally input clock and the enable signal into a path of serial signal by using the SERDES device thereof, forms a serial interface differential electrical signal and outputs the serial interface differential electrical signal to the optical transmission module 2, and the optical transmission module 2 converts the electrical signal into an optical signal and then transmits the optical signal to the receiving end through the optical transmission module. At the receiving end, the light receiving module 4 converts the received light signal into an electrical signal, and the serial-to-parallel conversion module 5, i.e., the SERDES device, performs serial-to-parallel conversion on the serial interface differential electrical signal, restores image data, a clock and an enable signal, and simultaneously sends the signals to the satellite back-end processing equipment.
Fig. 3 shows an implementation manner of a parallel-to-serial conversion module and a serial-to-parallel conversion module in the high-speed payload data optical fiber transmission interface according to this embodiment. Both modules adopt a socket IO module embedded in Virtex series FPGA of Xilinx company. At a sending end, performing parallel-serial conversion; at the receiving end, serial-to-parallel conversion is performed. At a transmitting end, Cyclic Redundancy Check (CRC) is carried out on parallel data received by the parallel-serial conversion module 1 according to a certain algorithm, a CRC check code is inserted into the parallel data, then the data is written into a transmitting end FIFO through 8b/10b coding, converted into serial differential data and transmitted to the rear-end optical transmission module 2. At the receiving end, the serial differential electric signal received by the serial-parallel conversion module 5 is written into a buffer, converted into parallel data through serial-parallel conversion, decoded by 8b/10b, written into the receiving end buffer, subjected to CRC check and then output in parallel. In fig. 2, the reference clock is preferably an external clock source with high stability and high accuracy; the parallel data selects 64 bits, the clock frequency selects 125MHz, so the effective speed of the single-path signal can reach 8.0Gbit/s, and the actual speed of the single-path signal reaches 10.0Gbit/s because 8b/10b coding and decoding are adopted. It should be noted that, in fig. 3, the functions of CRC check, 8b/10b codec, and the like are configurable, and they may be added to the data link or bypassed, and the configuration may be determined according to the actual use requirement.
As shown in fig. 4, the optical transmission module 2 includes an input interface 21, an encoding circuit 22, and an optical transmission circuit 23; the input interface 21 receives the high-speed serial differential electrical signal of the transmitting end and sends the signal to the encoding circuit 22; the encoding circuit 22 receives the transmitting-end high-speed serial differential electrical signal, performs redundancy encoding and scrambling on the transmitting-end high-speed serial differential electrical signal, and transmits the signal to the optical transmitting circuit 23; the optical transmission circuit 23 performs light source modulation on the encoded and scrambled transmitting-end high-speed serial differential electrical signal to obtain a transmitting-end optical signal.
Specifically, fig. 4 is a diagram illustrating an implementation manner of the optical transmission module 2 in the high-speed load data optical fiber transmission interface according to this embodiment. In the optical transmission module, an input interface 21 is used for receiving the high-speed serial differential signal of the transmitting end output from the parallel-serial conversion module 1, and sending the high-speed serial differential signal to a rear-end coding circuit for line code pattern conversion. On one hand, the coding circuit is used for disturbing the distribution of '0' and '1' in the binary signal and reducing the fluctuation of the direct current component of the binary signal; on the other hand, for inserting redundant information to perform error detection and error correction, encoding methods such as scrambling, 3b/4b transform code, and insertion code can be generally adopted. The optical transmission circuit is mainly used for carrying out light source modulation on the coded electric signal and coupling the optical signal output from the tail fiber into an optical fiber circuit for transmission; in the embodiment, the actual speed of a single path reaches 10.0Gbit/s, so that a direct modulation mode with a simple structure is adopted, digital information is converted into driving current and modulated onto an optical carrier, and an optical signal with the carrier power changing along with time is output.
As shown in fig. 5, the optical transmission module 3 includes a transmitting-side optical fiber connector 31, a radiation-resistant optical fiber 32, and a receiving-side optical fiber connector 33; wherein, one end of the transmitting end optical fiber connector 31 is connected with the optical transmitting module 2, and the other end of the transmitting end optical fiber connector 31 is connected with one end of the anti-radiation optical fiber 32; the other end of the radiation-resistant optical fiber 32 is connected to the light-receiving module 4.
Specifically, fig. 5 is a schematic block diagram of the optical transmission module 3 in the high-speed load data optical fiber transmission interface of the present embodiment. The transmitting end optical fiber connector 31 is used for connecting the tail fiber of the optical transmission module 2 with the anti-radiation optical fiber 32, so that the optical signal is coupled from the tail fiber of the optical transmission module to the anti-radiation optical fiber 32; the receiving-end optical fiber connector 33 interfaces the radiation-resistant optical fiber 32 with the pigtail of the optical reception module 4, so that the optical signal is coupled from the radiation-resistant optical fiber to the pigtail of the optical reception module 4. The optical fiber transmission medium of the aerospace product mainly considers the adaptability and reliability of the space environment, and the selected optical fiber connector and the selected optical fiber are required to have the characteristics of radiation resistance, strong vibration resistance, high and low temperature resistance and the like.
As shown in fig. 6, the light receiving module 4 includes a photodetector 41, a pre-amplifier circuit 42, a main amplifier circuit 43, an equalizer circuit 44, a clock recovery circuit 45, a decision circuit 46, an inverse code pattern transform circuit 47, and an output interface 48; wherein, the optical detector 41 converts the receiving end optical signal into an electrical signal and transmits the electrical signal to the pre-amplifying circuit 42; the pre-amplification circuit 42 amplifies the electrical signal to obtain a first amplified electrical signal and sends the first amplified electrical signal to the main amplification circuit 43; the main amplification circuit 43 amplifies the first amplified electrical signal again to obtain a second amplified electrical signal, and sends the second amplified electrical signal to the equalization circuit 44; the equalization circuit 44 supplements and shapes the second amplified electrical signal, outputs an equalized electrical signal, and sends the equalized electrical signal to the decision circuit 46; the clock recovery circuit 45 recovers a clock signal from the equalized electrical signal, and phase-shifts the clock signal and sends the clock signal to the decision circuit 46; the decision circuit 46 performs clock sampling on the equalized electrical signal, compares the amplitude of the sampled signal with a decision threshold value, recovers the digital signals transmitted by '0' and '1', and sends the recovered digital signals to the code pattern inverse transformation circuit 47; the code pattern inverse transformation circuit 47 synchronizes, descrambles and decodes the restored digital signal to obtain a code pattern inverse transformed signal, and sends the code pattern inverse transformed signal to the output interface 48; the output interface 48 converts the code pattern inversely converted signal into a receiving-end high-speed serial differential electrical signal, and sends the receiving-end high-speed serial differential electrical signal to the serial-to-parallel conversion module 5.
Specifically, fig. 6 is a diagram illustrating an implementation manner of the optical receiving module 4 in the high-speed payload data optical fiber transmission interface according to this embodiment. After the optical signal modulated by the optical transmitter module 2 is transmitted through the optical fiber to the receiving end, the optical detector 41 in the optical receiver module can detect the intensity of the optical signal incident on its surface, and convert the optical signal into a corresponding electrical signal according to the intensity of the optical signal, which is the core part of the optical receiver module. Because the optical signal reaching the receiving end is very weak, the current signal output by the detector is only in the order of nano-amperes (nA), so that the weak electric signal is amplified to a level which can be correctly identified by a decision circuit after multistage amplification is adopted. The preamplifier 42 can satisfy the requirements of low noise and high gain amplification, and can ensure the signal-to-noise ratio of the whole optical receiving module. The electrical signal output by the preamplifier 42 is still weak and cannot meet the requirement of amplitude judgment, so that the electrical signal further enters the main amplifying circuit 43 for amplification; the output signal of the main amplifier circuit 43 is sent to the equalizer circuit 44, and the intersymbol interference signal with transmission distortion is equalized and amplified, and the waveform is modified as necessary, so that the back-end decision circuit 46 can perform decision regeneration. The clock recovery circuit 45 recovers a clock signal from the equalized electrical signal, and appropriately shifts the phase of the clock signal and sends the clock signal to the decision circuit 46; the decision circuit 46 performs clock sampling on the equalized electrical signal, compares the amplitude of the sampled signal with a decision threshold, and recovers the digital signals transmitted by "0" and "1". For the output part of the optical receiving module, descrambling processing (corresponding to scrambling processing in the optical transmitting module) is performed by the code pattern inverse transformation circuit 47, and finally, the receiving-end high-speed serial differential electrical signal is output through the output interface 48. For a socket IO high-speed serial transceiver, the matching impedance of the output interface can be selected to be 50 Ω or 75 Ω.
The invention combines the high-speed serial SERDES transceiver with the optical fiber transmission, and provides the optical fiber transmission interface composition method based on the socket IO transceiver module, the single-path signal transmission rate can be increased from 2.0Gbit/s to 10Gbit/s, and the speed and the capacity of remote sensing satellite load data transmission are improved; according to the invention, the optical fiber transmission medium is used for replacing the traditional copper wire transmission medium, the current cannot be generated in the optical fiber by the self signal of the equipment and the external electromagnetic radiation, the light wave in the optical fiber is well limited in the fiber core, no leakage exists in the transmission process, the remote sensing satellite data transmission system has excellent radio frequency interference resistance and electromagnetic interference resistance, and the reliability and the safety of the remote sensing satellite data transmission system are improved; the invention has high transmission rate, and simultaneously, the optical fiber has small size and light weight, thereby greatly reducing the configuration quantity of the transceiver module, the external connector and the transmission medium in the equipment, reducing the weight and the volume of load equipment, data receiving equipment and a transmission cable, simplifying the connection relation of a satellite, saving the system cost, and being beneficial to the miniaturization, the light weight and the low-cost design of the satellite; the invention utilizes the characteristic of extremely low transmission loss of the optical fiber, and has longer supportable transmission distance compared with the traditional cable. In order to reduce the transmission loss between the remote sensing load sending equipment and the data receiving equipment, the distance between the receiving and sending equipment is generally required to be 3-5 m when cable transmission is adopted, and the limitation is not caused when optical fiber transmission is adopted (the transmission distance can reach 100km through an optical fiber interface with the transmission rate of 10 Gbit/s).
The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (7)
1. A remote sensing satellite high-speed load data optical fiber transmission interface is characterized by comprising: the optical transceiver comprises a parallel-serial conversion module (1), an optical transmission module (2), an optical transmission module (3), an optical receiving module (4) and a serial-parallel conversion module (5); wherein,
the parallel-serial conversion module (1) is connected with the image processing circuit (6), and the parallel-serial conversion module (1) is used for receiving the multi-channel parallel image data processed by the image processing circuit (6), performing redundancy check, 8b/10b coding and serial coding on the multi-channel parallel image data to obtain a sending end high-speed serial differential electrical signal, and sending the sending end high-speed serial differential electrical signal to the light sending module (2);
the optical transmission module (2) performs electro-optical conversion on the high-speed serial differential electrical signal at the transmitting end to obtain an optical signal at the transmitting end, and transmits the optical signal at the transmitting end to the optical transmission module (3);
the optical transmission module (3) receives the optical signal of the sending end and sends the optical signal to the optical receiving module (4);
the optical receiving module (4) receives the optical signal of the sending end and carries out optical-electrical conversion on the optical signal to obtain a high-speed serial differential electrical signal of the receiving end, and the high-speed serial differential electrical signal of the receiving end is sent to the serial-parallel conversion module (5);
the serial-parallel conversion module (5) receives the receiving end high-speed serial differential electric signal, converts the receiving end high-speed serial differential electric signal into receiving end parallel data, and restores a plurality of paths of parallel image data, a clock and a gating signal through 8b/10b decoding.
2. The remote sensing satellite high-speed load data optical fiber transmission interface of claim 1, wherein: the parallel-serial conversion module (1) is a SERDES transceiver.
3. The remote sensing satellite high-speed load data optical fiber transmission interface of claim 1, wherein: the optical transmission module (2) comprises an input interface (21), an encoding circuit (22) and an optical transmission circuit (23); wherein,
the input interface (21) receives a sending end high-speed serial differential electric signal and sends the sending end high-speed serial differential electric signal to the coding circuit (22);
the encoding circuit (22) receives the high-speed serial differential electrical signal of the sending end, performs redundancy encoding and scrambling on the high-speed serial differential electrical signal of the sending end and then sends the high-speed serial differential electrical signal of the sending end to the optical sending circuit (23);
and the optical transmitting circuit (23) performs light source modulation on the coded and scrambled high-speed serial differential electrical signal of the transmitting end to obtain an optical signal of the transmitting end.
4. The remote sensing satellite high-speed load data optical fiber transmission interface of claim 1, wherein: the optical transmission module (3) comprises a transmitting end optical fiber connector (31), a radiation-resistant optical fiber (32) and a receiving end optical fiber connector (33); wherein,
one end of the transmitting end optical fiber connector (31) is connected with the optical transmitting module (2), and the other end of the transmitting end optical fiber connector (31) is connected with one end of the anti-radiation optical fiber (32);
the other end of the anti-radiation optical fiber (32) is connected with the light receiving module (4).
5. The remote sensing satellite high-speed load data optical fiber transmission interface of claim 1, wherein: the optical receiving module (4) comprises a light detector (41), a pre-amplification circuit (42), a main amplification circuit (43), an equalization circuit (44), a clock recovery circuit (45), a decision circuit (46), a code pattern inverse transformation circuit (47) and an output interface (48); wherein,
the optical detector (41) converts the optical signal of the receiving end into an electric signal and transmits the electric signal to the pre-amplification circuit (42);
the pre-amplification circuit (42) amplifies the electric signal to obtain a first amplified electric signal and sends the first amplified electric signal to the main amplification circuit (43);
the main amplifying circuit (43) amplifies the first amplified electric signal again to obtain a second amplified electric signal, and sends the second amplified electric signal to the equalizing circuit (44);
the equalization circuit (44) supplements and shapes the second amplified electrical signal, outputs an equalized electrical signal and sends the equalized electrical signal to the decision circuit (46);
the clock recovery circuit (45) recovers a clock signal from the equalized electric signal, and phase-shifts the clock signal and sends the clock signal to the decision circuit (46);
the decision circuit (46) performs clock sampling on the equalized electric signals, compares the amplitude of the sampled signals with a decision threshold value, recovers digital signals transmitted by '0' and '1', and sends the recovered digital signals to the code pattern inverse transformation circuit (47);
the code pattern inverse transformation circuit (47) synchronizes, descrambles and decodes the restored digital signal to obtain a code pattern inverse transformed signal, and sends the code pattern inverse transformed signal to the output interface (48);
the output interface (48) converts the signals after code pattern inverse transformation into high-speed serial differential electrical signals at the receiving end and sends the high-speed serial differential electrical signals to the serial-parallel conversion module (5).
6. The remote sensing satellite high-speed load data optical fiber transmission interface of claim 5, wherein: the preamplifier circuit (42) is a low noise and wide frequency band preamplifier.
7. The remote sensing satellite high-speed load data optical fiber transmission interface of claim 1, wherein: the serial-parallel conversion module (5) is a SERDES transceiver.
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