CN116094602A - Satellite-borne laser communication terminal and signal processing method thereof - Google Patents
Satellite-borne laser communication terminal and signal processing method thereof Download PDFInfo
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- CN116094602A CN116094602A CN202211741250.1A CN202211741250A CN116094602A CN 116094602 A CN116094602 A CN 116094602A CN 202211741250 A CN202211741250 A CN 202211741250A CN 116094602 A CN116094602 A CN 116094602A
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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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- 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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/118—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum specially adapted for satellite communication
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a satellite-borne laser communication terminal and a signal processing method thereof, which are used for improving the receiving sensitivity of a system in a low-speed mode, greatly reducing the power of a corresponding transmitting end and further meeting the low-power consumption requirement of the system. The terminal comprises a signal processing device, a transmitting module, a receiving module and a receiving-transmitting optical path, wherein: the signal processing device is used for generating baseband signals with different transmission rates and sending the baseband signals to the transmission module; the transmitting module is used for modulating the baseband signal into a first optical signal with a corresponding wavelength according to the transmitting rate and transmitting the first optical signal to the receiving and transmitting optical path; the receiving and transmitting optical path is used for converting the first optical signal sent by the transmitting module into space optical transmission; when receiving the space optical signal sent by the opposite-end communication terminal, converting the received space optical signal into a second optical signal and sending the second optical signal to the receiving module; the receiving module is specifically configured to convert the second optical signal into a baseband signal and send the baseband signal to the signal processing device.
Description
Technical Field
The invention relates to the technical field of laser communication application, in particular to a satellite-borne laser communication terminal and a signal processing method thereof.
Background
The space laser communication is a communication mode for transmitting data information such as images, voice, signals and the like in free space by using laser beams as carriers, and has the advantages of high transmission rate, large communication capacity, strong electromagnetic interference resistance, high confidentiality and the like, and the communication terminal is small in size, low in power consumption and good in practicability. The inter-satellite laser communication is the core of a constellation system transmission layer, and the transmission rate is generally between 100Mbps and 10 Gbps. In order to reduce the average power consumption of the satellite-borne laser communication terminal, the multi-type system provides the laser communication terminal with adjustable high-speed and low-speed rates. The terminal receiving system has different receiving end sensitivity in the high-speed and low-speed states, so that the required transmitting power is different when the same link budget is realized. When the data volume of the system is higher, a high-speed communication mode is adopted, and when the data volume is lower, a low-speed mode is adopted to reduce the power of a transmitting end, and compared with the high-speed mode, the low-speed mode can obviously reduce the power consumption of the system.
However, in practical engineering implementation, the method has limited power consumption benefits. In the current design, the reception of different rates is realized by adopting the same APD. APDs are generally designed according to the requirement of a specific speed, a receiving photosensitive surface and a back-end processing matching circuit are physically solidified during design, the high-speed mode and the low-speed mode are not greatly different, and theoretical values are difficult to realize. Taking a domestic APD as an example, the receiving sensitivities of 1Gbps and 10Gbps are respectively-31 dBm and-29 dBm, the sensitivity is only 2dB different, the theoretical value of 10dB is larger, and the income brought by the system power consumption in the low-speed mode is not obvious, so that how to greatly reduce the system power consumption in the low-speed mode becomes one of the problems to be solved.
Disclosure of Invention
The invention provides a satellite-borne laser communication terminal and a signal processing method thereof, which are used for improving the receiving sensitivity of a system in a low-speed mode, greatly reducing the power of a corresponding transmitting end and further meeting the low-power consumption requirement of the system.
In a first aspect, there is provided a satellite-borne laser communication terminal comprising: signal processing device 1, transmitting module 2, receiving module 3 and receive-dispatch light path 4, wherein:
the signal processing device 1 is configured to generate baseband signals with different transmission rates, and send the baseband signals to the transmission module 2;
the transmitting module 2 is configured to modulate the baseband signal into a first optical signal with a corresponding wavelength according to a transmitting rate and send the first optical signal to the transceiving optical path 4;
the transceiving optical path 4 is configured to convert the first optical signal sent by the transmitting module into spatial optical transmission; when receiving the space optical signal sent by the opposite-end communication terminal, converting the received space optical signal into a second optical signal and sending the second optical signal to the receiving module 3;
the receiving module 3 is specifically configured to convert the second optical signal into a baseband signal and send the baseband signal to the signal processing device 1.
In one embodiment, the transmitting module 2 comprises several rate tunable lasers matching different receiving rates, a transmitting WDM and a fiber amplifier; and
the signal processing device 1 is specifically configured to send the baseband signal to the first rate-adjustable laser when determining that the baseband signal is a low-speed signal according to the transmission rate; when the baseband signal is determined to be a high-speed signal according to the transmitting rate, the baseband signal is transmitted to the second rate-adjustable laser;
the first rate-tunable laser is configured to modulate the baseband signal into a first optical signal with a first wavelength and send the first optical signal to the transmitting WDM;
the second rate-tunable laser is configured to modulate the baseband signal into a first optical signal with a second wavelength and send the first optical signal to the transmitting WDM;
the transmitting WDM is used for transmitting the received first optical signal to the optical fiber amplifier;
the optical fiber amplifier is configured to amplify the first optical signal and send the amplified signal to the transceiver optical path 4.
In one embodiment, the receiving module 3 comprises a plurality of high-speed avalanche photodiodes APD and a plurality of low-speed high-sensitivity APDs, receiving WDM; and
the receiving WDM configured to receive the second optical signal; and if it is determined that the second optical signal is a low-speed signal according to the rate or wavelength of the second optical signal, transmitting the second optical signal to the low-speed high-sensitivity APD; transmitting a second optical signal to the high-speed APD if it is determined that the second optical signal is a high-speed signal according to a rate or wavelength of the second optical signal;
the low-speed high-sensitivity APD or the high-speed APD is configured to convert the received second optical signal into a baseband signal and transmit the baseband signal to the signal processing device 1.
In one embodiment, the processing rate corresponding to the low-speed high-sensitivity APD is 100Mbps-1Gbps, the wavelength of the low-speed signal comprises C18-C61, the processing rate corresponding to the high-speed APD is 1Gbps-10Gbps, and the wavelength of the high-speed signal is C18-C61.
In one embodiment, the low-speed, high-sensitivity APD or the high-speed APD employs InGaAs material as the photosurface.
In one embodiment, the first or second rate tunable laser is an InP semiconductor laser.
In one embodiment, the transceiving optical path 4 and the optical fiber amplifier, the optical fiber amplifier and the transmitting WDM, the transmitting WDM and the first and second rate tunable lasers are connected by a single mode optical fiber; the single-mode optical fiber is an anti-irradiation single-mode optical fiber; the transmitting WDM employs a four-channel single-mode wavelength division multiplexer.
In one embodiment, the transceiving optical path 4 and the receiving WDM, the WDM and the low-speed high-sensitivity APD and the high-speed APD are connected by multimode optical fibers; the multimode optical fiber is an anti-irradiation multimode optical fiber; the receiving WDM adopts a dual-channel multimode fiber wavelength division multiplexer.
In one embodiment, the transceiver optical path 4 is a card-type coaxial transceiver optical path.
In a second aspect, a signal processing method of a satellite-borne laser communication terminal is provided, including:
the signal processing device 1 generates baseband signals with different transmission rates and sends the baseband signals to the transmission module 2;
the transmitting module 2 modulates the baseband signal into a first optical signal with a corresponding wavelength according to the transmitting rate and sends the first optical signal to the receiving-transmitting optical path 4;
the transceiving optical path 4 converts the first optical signal sent by the transmitting module 2 into spatial light for transmission; or when receiving the space optical signal sent by the opposite-end communication terminal, converting the received space optical signal into a second optical signal and sending the second optical signal to the receiving module 3;
the receiving module 3 converts the second optical signal into a baseband signal and sends the baseband signal to the signal processing device 1.
The invention provides a satellite-borne laser communication terminal and a signal processing method thereof, wherein the terminal comprises a signal processing device, a transmitting module, a receiving module and a receiving and transmitting optical path, wherein the transmitting module modulates a baseband signal generated by the signal processing device into an optical signal with a corresponding wavelength and sends the optical signal to the receiving and transmitting optical path, and the receiving and transmitting optical path converts the optical signal sent by the transmitting module into space light for transmission; when the receiving-transmitting optical path receives a space optical signal sent by the opposite-end communication terminal, the receiving-transmitting optical path converts the received space optical signal into an optical fiber signal and sends the optical fiber signal to the receiving module, the receiving module converts the received optical fiber signal into a baseband signal and sends the baseband signal to the signal processing device, further, the signal processing device sends the baseband signal to a corresponding rate-adjustable laser of the transmitting end for modulation according to the transmitting rate of the baseband signal, the modulated optical signal is sent to a transmitting WDM, the transmitting WDM sends the received optical signal to the optical fiber amplifier, the optical signal is amplified by the optical fiber amplifier and then sent to the receiving-transmitting optical path, further, the receiving WDM receives the optical signal in the receiving end and sends the received optical signal to an APD with the corresponding rate according to the rate or wavelength of the received optical signal, and the optical signal is converted into the baseband signal through the APD and then transmitted to the signal processing device.
The terminal adopts a working mode with switchable rate, and under different communication rates, the matching and processing of the rate and the wavelength are realized through WDM based on a plurality of APDs matched with different receiving rates. At the time of high-speed communication, signal transmission is performed using a conventional optical power. And the APD receiving sensitivity is improved during low-speed communication, and the optical transmitting power of a transmitting end can be reduced under the same link state, so that the power consumption of the whole machine is reduced, and the communication capacity and the reliability of the system are increased.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a schematic structural diagram of a satellite-borne laser communication terminal according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a satellite-borne laser communication terminal according to another embodiment of the present invention;
fig. 3 is a schematic diagram of an operating principle of a satellite-borne laser communication terminal according to another embodiment of the present invention.
Detailed Description
In order to improve the receiving sensitivity of a system in a low-speed mode and greatly reduce the power of a corresponding transmitting end, and further meet the low-power consumption requirement of the system, the embodiment of the invention provides a satellite-borne laser communication terminal and a signal processing method thereof.
It should be noted that the terms "first," "second," and the like in the description and the claims of the embodiments of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein.
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings of the specification, it being understood that the preferred embodiments described herein are for illustration and explanation only, and not for limitation of the present invention, and embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Example 1
The embodiment of the invention provides a satellite-borne laser communication terminal based on a wavelength division multiplexing technology, as shown in a schematic structural diagram of the satellite-borne laser communication terminal in fig. 1 according to an embodiment of the invention, the satellite-borne laser communication terminal comprises: signal processing device 1, transmitting module 2, receiving module 3 and receive-dispatch light path 4, wherein:
the signal processing device 1 is configured to generate baseband signals with different transmission rates, and send the baseband signals to the transmission module 2;
the transmitting module 2 is configured to modulate the baseband signal into a first optical signal with a corresponding wavelength according to a transmitting rate and send the first optical signal to the transceiving optical path 4;
the transceiving optical path 4 is configured to convert the first optical signal sent by the transmitting module into spatial optical transmission; when receiving the space optical signal sent by the opposite-end communication terminal, converting the received space optical signal into a second optical signal and sending the second optical signal to the receiving module 3;
the receiving module 3 is specifically configured to convert the second optical signal into a baseband signal and send the baseband signal to the signal processing device 1.
In specific implementation, the signal processing device 1 can adopt X7 series of Xilinx, more than one million gates of logic units, and can perform two-way parallel baseband signal processing.
Preferably, the transceiving optical path 4 is implemented by using a card type coaxial transceiving optical path.
In one embodiment, the transmitting module 2 comprises several rate tunable lasers matching different receiving rates, a transmitting WDM and a fiber amplifier; and
the signal processing device 1 is specifically configured to send the baseband signal to the first rate-adjustable laser when determining that the baseband signal is a low-speed signal according to the transmission rate; when the baseband signal is determined to be a high-speed signal according to the transmitting rate, the baseband signal is transmitted to the second rate-adjustable laser;
the first rate-tunable laser is configured to modulate the baseband signal into a first optical signal with a first wavelength and send the first optical signal to the transmitting WDM;
the second rate-tunable laser is configured to modulate the baseband signal into a first optical signal with a second wavelength and send the first optical signal to the transmitting WDM;
the transmitting WDM is used for transmitting the received first optical signal to the optical fiber amplifier;
the optical fiber amplifier is configured to amplify the first optical signal and send the amplified signal to the transceiver optical path 4.
In specific implementation, in a low-speed communication mode, the signal processing device 1 sends the generated low-speed baseband signal to a corresponding rate-adjustable laser, the generated low-speed baseband signal is modulated to an optical signal with a first wavelength by the rate-adjustable laser, the optical signal is input into a transmitting WDM (wavelength division multiplexing) and then enters an optical fiber amplifier for signal amplification, and the optical signal is converted into space optical transmission through a receiving and transmitting optical path 4; in the high-speed communication mode, the signal processing device 1 sends the generated high-speed baseband signal to a corresponding rate-adjustable laser, the generated high-speed baseband signal is modulated to an optical signal with a second wavelength by the rate-adjustable laser, the optical signal is input into a transmitting WDM, and then the optical signal enters an optical fiber amplifier for signal amplification and is converted into space optical transmission by a receiving and transmitting optical path 4. The first wavelength and the second wavelength are matched through receiving rate, and the receiving end realizes rate and wavelength matching and processing through receiving WDM.
Furthermore, a plurality of rate-adjustable lasers matched with different receiving rates are mutually backed up, so that the on-track service life and reliability of the system can be effectively improved.
In one embodiment, the first rate tunable laser or the second rate tunable laser is an InP semiconductor laser.
In one embodiment, the transceiving optical path 4 and the optical fiber amplifier, the optical fiber amplifier and the transmitting WDM, the transmitting WDM and the first and second rate tunable lasers are connected by a single mode optical fiber; the single-mode optical fiber is an anti-irradiation single-mode optical fiber; the transmitting WDM employs a four-channel single-mode wavelength division multiplexer.
Preferably, the optical fiber amplifier adopts a two-stage erbium-doped optical fiber amplifier to realize high-power amplification.
In one embodiment, the receiving module 3 comprises a plurality of high-speed avalanche photodiodes APD and a plurality of low-speed high-sensitivity APDs, receiving WDM; and
the receiving WDM configured to receive the second optical signal; and if it is determined that the second optical signal is a low-speed signal according to the rate or wavelength of the second optical signal, transmitting the second optical signal to the low-speed high-sensitivity APD; transmitting a second optical signal to the high-speed APD if it is determined that the second optical signal is a high-speed signal according to a rate or wavelength of the second optical signal;
the low-speed high-sensitivity APD or the high-speed APD is configured to convert the received second optical signal into a baseband signal and transmit the baseband signal to the signal processing device 1.
In the implementation, in a low-speed communication mode, when a space optical signal sent by an opposite-end communication terminal is received, the space optical signal is converted into an optical fiber signal through a receiving and transmitting optical path 4 and is input into a receiving WDM input end, the receiving WDM matches a low-speed signal with a first wavelength to a low-speed high-sensitivity APD to realize photoelectric conversion, and the low-speed high-sensitivity APD is transmitted to a signal processing device 1 for data processing; in the high-speed communication mode, when receiving the space optical signal sent by the opposite-end communication terminal, the space optical signal is converted into an optical fiber signal through the receiving and transmitting optical path 4 and is input to the receiving WDM input end, the receiving WDM matches the low-speed signal with the second wavelength to the high-speed APD to realize photoelectric conversion, and the low-speed signal is transmitted to the signal processing device 1 for data processing.
Furthermore, each APD performs targeted process and circuit design optimization on the matched receiving rate, for example, different photosensitive surface sizes, back-end matching circuit device parameters and the like are selected, and under different communication rates, the system can reach the designed optimal sensitivity.
Further, the high-speed APD and the low-speed high-sensitivity APD are mutually backed up, and the high-speed APD can be downward compatible to process signals, so that the on-track service life and the reliability of the system are improved.
The terminal adopts a multi-rate switchable working mode: at the time of high-speed communication, signal transmission is performed using a conventional optical power. And the APD receiving sensitivity is improved during low-speed communication, and the optical transmitting power of the transmitting end can be reduced under the same link state, so that the power consumption of the whole machine is reduced. On the basis, the low-speed mode and the high-speed mode can work simultaneously, and the receiving gating or the transmitting beam combination is carried out through the wavelength division multiplexer, so that the communication capacity of the system is further improved.
In one embodiment, the low-speed high-sensitivity APD corresponds to a communication rate of 100Mbps-1Gbps, the matched wavelength comprises C18-C61, the high-speed APD corresponds to a communication rate of 1Gbps-10Gbps, and the matched wavelength comprises C18-C61.
In one embodiment, the low-speed, high-sensitivity APD or the high-speed APD employs InGaAs material as the photosurface for high-sensitivity detection.
In one embodiment, the transceiving optical path 4 and the receiving WDM, the WDM and the low-speed high-sensitivity APD and the high-speed APD are connected by multimode optical fibers; the multimode optical fiber is an anti-irradiation multimode optical fiber; the receiving WDM adopts a dual-channel multimode fiber wavelength division multiplexer.
Preferably, the low-speed high-sensitivity APD, the high-speed APD, the first rate-adjustable laser and the second rate-adjustable laser are all mounted on an optical transceiver module substrate, and the optical transceiver module substrate can be an FR4 substrate. The signal processing device 1 is connected to each APD and each rate-adjustable laser by a connection line, which may be implemented as a high-speed signal line on a PCB (printed circuit board).
The terminal can select a plurality of groups of APDs and rate-adjustable lasers according to the system requirement, and respectively match different receiving rates, and each receiving rate is matched with different wavelengths, so that the switching of a plurality of rates and a plurality of corresponding system transmitting powers is realized.
Based on the requirement that the power consumption of the whole machine is greatly reduced in a low-speed mode of the incoherent laser terminal, the first embodiment provides a satellite-borne laser communication terminal. The terminal consists of APD, receiving WDM, transmitting WDM, signal processing device, etc. which are matched with different receiving rates. Each independent APD is matched with different receiving rates and receiving and transmitting wavelengths respectively, the matching design is carried out corresponding to different communication rates, receiving and transmitting optical signals are received and gated or transmitted through a wavelength division multiplexer, the different communication rates and the different wavelengths correspond, and when the wireless communication terminal works, the wavelength division multiplexer gates or synthesizes the signals to corresponding receiving and transmitting ports through the set wavelengths in the working mode to realize the receiving processing or transmitting and amplifying functions, so that the receiving sensitivity of the terminal is effectively improved, the low-power consumption requirement of the system is further met, the long-term power consumption of the terminal is obviously reduced, the communication capacity and the reliability of the system are increased, and an effective technical means is provided for the on-orbit engineering application of the laser communication terminal.
Example two
On the basis of the first embodiment, the present application further provides a second embodiment for better understanding by those skilled in the art, and the following detailed description of the present embodiment is provided.
In order to meet the requirement of greatly reducing the power consumption of the whole machine of the incoherent laser terminal in a low-speed mode, the embodiment provides a satellite-borne laser communication terminal, which adopts two independent APDs to respectively match two different receiving rates and receiving and transmitting wavelengths and has a high-efficiency double-rate receiving and transmitting system. The terminal consists of two independent APDs (high-speed avalanche photodiodes), WDMs (wavelength division multiplexers), signal processing devices and the like. The two independent APDs are respectively matched with two different receiving rates and receiving and transmitting wavelengths, and the receiving and transmitting optical signals are subjected to receiving gating or transmitting beam combination through a wavelength division multiplexer. The two independent APDs are respectively matched and designed corresponding to different communication rates, and the receiving sensitivity can be remarkably improved in a low-speed mode. Different communication rates correspond to different wavelengths, and when the WDM works, signals can be gated or synthesized to corresponding receiving and transmitting ports through the wavelengths set in the working mode to realize the receiving processing or transmitting and amplifying functions. The terminal can effectively improve the sensitivity of the system in a low-speed mode, and further meets the low-power consumption requirement of the system.
In order to reduce the average power consumption of the on-orbit operation of the laser communication terminal, the satellite laser communication terminal provided by the embodiment adopts a double-rate switchable working mode: at the time of high-speed communication, signal transmission is performed using a conventional optical power. And the APD receiving sensitivity is improved during low-speed communication, and the optical transmitting power of the transmitting end can be reduced under the same link state, so that the power consumption of the whole machine is reduced.
The present terminal, as shown in fig. 2, is a schematic structural diagram of a satellite-borne laser communication terminal according to another embodiment of the present invention, including:
the satellite-borne laser communication terminal receiving and transmitting system comprises a signal processing device, a low-speed high-sensitivity APD, a high-speed APD, a speed-adjustable laser 1, a speed-adjustable laser 2, a receiving WDM, a transmitting WDM, an optical fiber amplifier, a receiving and transmitting optical path, a connecting wire 1-connecting wire 4, a multimode optical fiber 1-multimode optical fiber 2, a multimode optical fiber 3, a single-mode optical fiber 3-single-mode optical fiber 4 and an optical receiving and transmitting module substrate. The low-speed high-sensitivity APD, the high-speed APD, the rate-adjustable laser 1 and the rate-adjustable laser 2 are all arranged on the substrate of the optical transceiver module. The signal processing device is connected with the low-speed high-sensitivity APD, the high-speed APD, the speed-adjustable laser 1 and the speed-adjustable laser 2 through connecting wires 1-4, and the connecting wires can be realized in a mode of PCB printed board wiring or high-speed communication cables. The low-speed high-sensitivity APD and the high-speed APD are connected with a receiving WDM through a multimode optical fiber 1-multimode optical fiber 2, the speed-adjustable laser 1, the speed-adjustable laser 2 is connected with a transmitting WDM through a single-mode optical fiber 1-single-mode optical fiber 2, and the receiving WDM is connected with a receiving and transmitting optical path through a multimode optical fiber 3. The transmitting WDM is connected to an optical fiber amplifier via a single mode fiber 3, and the optical fiber amplifier is connected to a transmit-receive optical path via a single mode fiber 4.
As shown in fig. 3, according to another embodiment of the present invention, in order to ensure the isolation between transmission and reception, the incoherent communication system distinguishes wavelengths according to the AB machine, the a machine receives wavelength 1 (corresponding to the low-speed mode) and wavelength 2 (corresponding to the high-speed mode), and transmits wavelength 3 (corresponding to the low-speed mode) and wavelength 4 (corresponding to the high-speed mode), and the B machine is opposite.
In the low-speed communication mode: wavelength 1 and wavelength 3 are used in pairs: the signal processing device at the transmitting end of the A machine generates a low-speed baseband signal, the low-speed baseband signal is modulated to an optical signal with a wavelength 3 through a rate-adjustable laser 1, and the optical signal is input into a transmitting WDM (wavelength division multiplexing) and enters an optical fiber amplifier for signal amplification and is converted into space optical transmission through a receiving and transmitting optical path; after receiving the signal, the B machine converts the signal into an optical fiber signal through a receiving and transmitting optical path and inputs the optical fiber signal into a receiving WDM input end, the receiving WDM matches the signal with the wavelength 3 to a low-speed high-sensitivity APD to realize photoelectric conversion, and the optical fiber signal enters a B machine signal processing device to process data. When the B machine transmits, the low-speed signal is modulated to the wavelength 1 for transmission, and the A machine receiving end realizes the matching and processing of the speed and the wavelength by receiving WDM.
In the high-speed communication mode: wavelength 2 and wavelength 4 are used in pairs. The signal processing device at the transmitting end of the A machine generates a high-speed baseband signal, the high-speed baseband signal is modulated to an optical signal with a wavelength 4 through the rate-adjustable laser 2, and the optical signal is input into a transmitting WDM (wavelength division multiplexing) and enters an optical fiber amplifier for signal amplification and is converted into space optical transmission through a receiving and transmitting optical path; after receiving the signal, the B machine converts the signal into an optical fiber signal through a receiving and transmitting optical path and inputs the optical fiber signal into a receiving WDM input end, the receiving WDM matches the signal with the wavelength of 4 to a complaint APD to realize photoelectric conversion, and the optical fiber signal enters a B machine signal processing device to process data. When the B machine transmits, the high-speed signal is modulated to the wavelength 2 for transmission, and the A machine receiving end realizes the matching and processing of the speed and the wavelength by receiving WDM.
In the specific implementation, the signal processing device adopts X7 series of Xilinx, more than one million gates of logic units can perform double-path parallel baseband signal processing, the low-speed high-sensitivity APD and the high-speed APD adopt InGaAs materials as photosensitive surfaces to realize high-sensitivity detection, and the rate-adjustable laser 1 and the rate-adjustable laser 2 adopt InP semiconductor lasers; the receiving WDM selects a double-channel multimode optical fiber wavelength division multiplexer, the transmitting WDM selects a four-channel single-mode wavelength division multiplexer, and the optical fiber amplifier selects a two-stage erbium-doped optical fiber amplifier to realize high-power amplification; the receiving and transmitting optical path is realized by adopting a card type coaxial receiving and transmitting optical path, the connecting line 1-4 is a high-speed signal line on a PCB printed board, the multimode optical fiber 1, the multimode optical fiber 2 and the multimode optical fiber 3 are anti-irradiation multimode optical fibers, the single-mode optical fiber 1-4 is an anti-irradiation single-mode optical fiber, and the optical receiving and transmitting module substrate is an FR4 substrate. The low-speed communication mode rate is 100Mbps-1Gbps, and the matched wavelength is C18-C61. The high-speed communication mode rate is 1Gbps-10Gbps, and the matched wavelength is C18-C61. When the terminal works, the receiving sensitivity of the low-speed high-sensitivity APD in a low-speed communication mode under the error rate of 1Gbps and 10e-3 can reach-39 dBm, and the transmitting power of the corresponding transmitting end is 0.5W (the transmitting power of the optical fiber amplifier is 5W); the high-speed APD receives the sensitivity of-29 dBm at 10Gbps and 10e-3 in the high-speed communication mode, and the transmitting power of the corresponding transmitting end is 4W (the transmitting power of the optical fiber amplifier is 40W). The low-speed communication mode has power consumption that is significantly reduced by 35W compared to the high-speed mode. The maximum speed of the double-way parallel working can reach 20Gbps, and the service life is prolonged by more than 3 years compared with the traditional design.
The receiving of the current incoherent optical communication system in different working modes is realized by adopting the same APD, the problems of photosensitive surface, processing technology and rear end matching are limited, and the sensitivity of the low-speed working mode is improved to a limited extent compared with that of the high-speed working mode and is far lower than a theoretical value. According to the terminal provided by the embodiment, two independent APDs are adopted to be respectively matched with two different receiving rates and receiving and transmitting wavelengths, so that the receiving sensitivity of the system in a low-speed mode is effectively improved, the power of a corresponding transmitting end is greatly reduced, the low-power consumption requirement of the system is further met, and the problem that the power consumption reduction and income limitation caused by the fact that the working speed of the laser communication terminal is switchable in the prior art is solved.
Example III
Based on the same technical conception, the embodiment of the application also provides a signal processing method of the satellite-borne laser communication terminal, and because the principle of solving the problem by the device is similar to that of the satellite-borne laser communication terminal, the implementation of the method can be referred to the implementation of the terminal, and the repetition is omitted.
The signal processing method of the satellite-borne laser communication terminal provided by the embodiment of the application comprises the following steps:
step one, the signal processing device 1 generates baseband signals with different transmission rates and sends the baseband signals to the transmission module 2;
step two, the transmitting module 2 modulates the baseband signal into a first optical signal with a corresponding wavelength according to the transmitting rate and sends the first optical signal to the transceiving optical path 4;
step three, the transceiving optical path 4 converts the first optical signal sent by the transmitting module 2 into a spatial optical transmission; or when receiving the space optical signal sent by the opposite-end communication terminal, converting the received space optical signal into a second optical signal and sending the second optical signal to the receiving module 3;
and step four, the receiving module 3 converts the second optical signal into a baseband signal and sends the baseband signal to the signal processing device 1.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The satellite-borne laser communication terminal is characterized by comprising a signal processing device (1), a transmitting module (2), a receiving module (3) and a receiving-transmitting optical path (4), wherein:
the signal processing device (1) is used for generating baseband signals with different transmission rates and sending the baseband signals to the transmission module (2);
the transmitting module (2) is used for modulating the baseband signal into a first optical signal with a corresponding wavelength according to a transmitting rate and transmitting the first optical signal to the receiving and transmitting optical path (4);
the receiving and transmitting optical path (4) is used for converting the first optical signal sent by the transmitting module into space optical transmission; when receiving the space optical signal sent by the opposite-end communication terminal, converting the received space optical signal into a second optical signal and sending the second optical signal to the receiving module (3);
the receiving module (3) is specifically configured to convert the second optical signal into a baseband signal and send the baseband signal to the signal processing device (1).
2. A terminal according to claim 1, characterized in that the transmitting module (2) comprises several rate-tunable lasers matching different reception rates, a transmitting WDM and a fiber amplifier; and
the signal processing device (1) is specifically configured to send the baseband signal to the first rate-adjustable laser when the baseband signal is determined to be a low-speed signal according to the transmission rate; when the baseband signal is determined to be a high-speed signal according to the transmitting rate, the baseband signal is transmitted to the second rate-adjustable laser;
the first rate-tunable laser is configured to modulate the baseband signal into a first optical signal with a first wavelength and send the first optical signal to the transmitting WDM;
the second rate-tunable laser is configured to modulate the baseband signal into a first optical signal with a second wavelength and send the first optical signal to the transmitting WDM;
the transmitting WDM is used for transmitting the received first optical signal to the optical fiber amplifier;
the optical fiber amplifier is used for amplifying the first optical signal and then sending the first optical signal to the receiving-transmitting optical path (4).
3. A terminal according to claim 1, characterized in that the receiving module (3) comprises a number of high-speed avalanche photodiodes APD and a number of low-speed high-sensitivity APDs, receiving WDM; and
the receiving WDM configured to receive the second optical signal; and if it is determined that the second optical signal is a low-speed signal according to the rate or wavelength of the second optical signal, transmitting the second optical signal to the low-speed high-sensitivity APD; transmitting a second optical signal to the high-speed APD if it is determined that the second optical signal is a high-speed signal according to a rate or wavelength of the second optical signal;
the low-speed high-sensitivity APD or the high-speed APD is used for converting the received second optical signal into a baseband signal and transmitting the baseband signal to the signal processing device (1).
4. A terminal according to claim 3, wherein the low-speed high-sensitivity APD corresponds to a processing rate of 100Mbps to 1Gbps, the wavelength of the low-speed signal includes C18 to C61, the high-speed APD corresponds to a processing rate of 1Gbps to 10Gbps, and the wavelength of the high-speed signal is C18 to C61.
5. A terminal according to claim 3, wherein the low-speed high-sensitivity APD or the high-speed APD employs InGaAs material as a photosurface.
6. The terminal of claim 2, wherein the first or second rate tunable laser is an InP semiconductor laser.
7. A terminal according to claim 2, characterized in that the transceiving optical path (4) and the optical fiber amplifier, the optical fiber amplifier and the transmitting WDM, the transmitting WDM being connected with the first and second rate tunable lasers by single mode optical fibers; the single-mode optical fiber is an anti-irradiation single-mode optical fiber; the transmitting WDM employs a four-channel single-mode wavelength division multiplexer.
8. A terminal according to claim 3, characterized in that the transceiving optical path (4) and the receiving WDM, the WDM being connected with the low-speed high-sensitivity APD and the high-speed APD by multimode optical fibers; the multimode optical fiber is an anti-irradiation multimode optical fiber; the receiving WDM adopts a dual-channel multimode fiber wavelength division multiplexer.
9. A terminal according to any of claims 1-8, characterized in that the transceiving optical path (4) is a card-type coaxial transceiving optical path.
10. A signal processing method for a satellite-borne laser communication terminal according to any one of claims 1 to 9, comprising:
the signal processing device (1) generates baseband signals with different transmission rates and sends the baseband signals to the transmission module (2);
the transmitting module (2) modulates the baseband signal into a first optical signal with a corresponding wavelength according to the transmitting rate and sends the first optical signal to the receiving-transmitting optical path (4);
the receiving and transmitting optical path (4) converts a first optical signal sent by the transmitting module (2) into space optical transmission; or when receiving the space optical signal sent by the opposite-end communication terminal, converting the received space optical signal into a second optical signal and sending the second optical signal to the receiving module (3);
the receiving module (3) converts the second optical signal into a baseband signal and sends the baseband signal to the signal processing device (1).
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| CN202211741250.1A CN116094602A (en) | 2022-12-30 | 2022-12-30 | Satellite-borne laser communication terminal and signal processing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211741250.1A CN116094602A (en) | 2022-12-30 | 2022-12-30 | Satellite-borne laser communication terminal and signal processing method thereof |
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| CN202211741250.1A Pending CN116094602A (en) | 2022-12-30 | 2022-12-30 | Satellite-borne laser communication terminal and signal processing method thereof |
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| Country | Link |
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| CN (1) | CN116094602A (en) |
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