A space laser communication light transmission and receiving circuit system with ultra-high isolation and implementation method

Abstract

The present invention provides an ultra-high isolation space laser communication light receiving and transmitting circuit system and an implementation method, the system comprising: a spectrum measuring device and a plurality of filtering devices. Specifically, the system can measure the measurement band of the light beam emitted by the light path transmitting end through the spectrum measuring device, and determine the filtering band according to the measurement band and the preset target wavelength. Furthermore, the filtering band in the emitted light beam is filtered out through the filtering device, so that the light path transmitting end outputs a light beam of the preset target wavelength and filters out light beams of other wavelengths. Moreover, the preset target wavelength in the received light beam can also be filtered out through the filtering device at the light path receiving end, so that the light beam of the received signal wavelength is retained. In this way, the isolation of the space laser communication light receiving and transmitting circuit system can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of space laser communication, and in particular to an ultra-high isolation space laser communication light transmitting and receiving circuit system and an implementation method thereof. Background Art

[0002] With the in-depth development of deep space exploration projects, new requirements have been put forward for the bandwidth of deep space communications. Compared with microwave communications, space optical communications based on lasers have the advantages of large bandwidth, high speed, high energy efficiency and spectrum authorization-free. With the development of ground-based optical fiber communication technology and the successful verification of earth orbit satellite optical communication systems, space laser communication systems have gradually become a research hotspot for deep space communications.

[0003] In the application of space laser communication systems, laser communication at ultra-long distances between the Earth and the Moon and in deep space faces problems such as long communication distances and large link attenuation. The ground telescope system required to carry out space laser communication at ultra-long distances between the Earth and the Moon and in deep space requires a transmission power of hundreds of watts, while at the same time, the received power is at the photon level. This huge power difference requires extremely high isolation requirements for the light transmission and receiving paths of the ground-side optical system.

[0004] Related technology 1 increases the reflection angle of a portion of the back-reflected light in the optical path to reduce the probability of the back-scattered light being received in the optical path, but it cannot meet the requirements for ultra-high-power transmission signals. Related technology 2 eliminates the emission light reflected by the spectroscope when it is split by setting a reflector, a focusing lens, and a black body ball device. However, for high-power optical signal transmission, its spectrum width is relatively wide. In addition to the emission wavelength, there are also spectra in other bands. Its spectroscope and focusing lens only filter out the emission wavelength or absorb it with an absorbing black body after converging it. It cannot achieve the influence of other wavelength noise under ultra-high power transmission, nor can it meet the isolation requirements of ultra-high sensitivity detectors. It can be seen that the related technology cannot effectively improve the isolation of the light receiving and transmitting circuit of space laser communication, resulting in a low isolation of the light receiving and transmitting circuit of space laser communication, which cannot meet the application requirements. Summary of the invention

[0005] The technical problem to be solved by the present invention is the low isolation of the light transmitting and receiving circuits in space laser communication.

[0006] In order to solve the above technical problems, the present invention provides a space laser communication light transmission and receiving circuit system with ultra-high isolation and an implementation method, which specifically adopts the following technical solutions:

[0007] In the first aspect, the present invention provides an ultra-high isolation space laser communication light receiving and transmitting circuit system, comprising: an optical amplifier, a fine beacon and a signal transmitting lens, a laser, a coarse beacon transmitting lens, a signal receiving detector, a receiving lens, a first filter device, a second filter device, a third filter device and a spectrum measuring device. Among them, the optical amplifier is connected to the fine beacon and the signal transmitting lens, and the optical amplifier is used to transmit a first transmitting light beam through the fine beacon and the signal transmitting lens, and the first filter device is used to filter the first transmitting light beam according to the first filter band, and output a first filtered light beam of a first preset target wavelength. Among them, the first filter band is determined according to the first measurement band of the first transmitting light beam and the first preset target wavelength, and the first measurement band is measured by the spectrum measuring device. The laser is connected to the coarse beacon transmitting lens, and the laser is used to transmit a second transmitting light beam through the coarse beacon transmitting lens, and the second filter device is used to filter the second transmitting light beam according to the second filter band, and output a second filtered light beam of a second preset target wavelength. Among them, the second filter band is determined according to the second measurement band and the second preset target wavelength of the second transmitting light beam, and the second measurement band is measured by the spectrum measuring device. The signal receiving detector is connected to the receiving lens, the third filtering device is used to filter the first receiving light beam according to the first preset target wavelength and the second preset target wavelength, and output a third filtered light beam, and the signal receiving detector is used to receive the third filtered light beam through the receiving lens.

[0008] The system can measure the measurement band of the light beam emitted by the transmitting end of the optical path through a spectrum measuring device, and determine the filter band according to the measurement band and the preset target wavelength. Furthermore, the filter band in the emitted light beam is filtered out by the filter device, so that the transmitting end of the optical path only outputs a light beam with a preset target wavelength and filters out light beams of other wavelengths. Moreover, the preset target wavelength in the received light beam can also be filtered out by the filter device at the receiving end of the optical path, so that the light beam with the received signal wavelength is retained. In this way, the isolation of the space laser communication light receiving and transmitting path system can be effectively improved.

[0009] In combination with the first aspect, in an optional implementation, the system further includes: a first beam splitter, a second beam splitter, a piezoelectric deflection mirror, a beam adjustment assembly and a reflector. Among them, the first filter device is arranged between the precision beacon and the signal transmission lens and the first beam splitter. The first beam splitter, the second beam splitter and the piezoelectric deflection mirror are used to transmit the first filtered light beam to the beam adjustment assembly. The beam adjustment assembly is used to expand the first filtered light beam into a first expanded light beam, and inject the first expanded light beam into the reflector. The reflector is used to transmit the first expanded light beam to the large-aperture telescope system via the Coode optical path system for emission.

[0010] In combination with the first aspect, in an optional implementation, the second filter device is arranged between the coarse beacon transmitting lens and the second beam splitter. The second beam splitter and the piezoelectric deflection mirror are also used to transmit the second filtered light beam to the beam adjustment component. The beam adjustment component is also used to expand the second filtered light beam into a second expanded light beam, and inject the second expanded light beam into the reflector. The reflector is used to transmit the second expanded light beam to the large-aperture telescope system through the Coode optical path system for emission.

[0011] In combination with the first aspect, in an optional implementation, the third filter device is arranged between the receiving lens and the first beam splitter. The reflector is also used to receive an initial receiving light beam, which is received by the large-aperture telescope system and transmitted through the Kuder optical path system. The beam adjustment component is also used to shrink the initial receiving light beam into a first receiving light beam, and inject the first receiving light beam into the piezoelectric deflection mirror. The piezoelectric deflection mirror, the second beam splitter and the first beam splitter are also used to transmit the first receiving light beam to the third filter device.

[0012] In combination with the first aspect, in an optional implementation, the spectrum measurement device includes: an attenuator, a fiber collimator lens, and a spectrometer; the fiber collimator lens is connected to the spectrometer through a transmission optical fiber. The attenuator is used to receive a first emission light beam and attenuate the first emission light beam into a first attenuated light beam; the fiber collimator lens is used to couple the first attenuated light beam into the transmission optical fiber; the spectrometer is used to determine a first measurement band according to the first attenuated light beam. The attenuator is also used to receive a second emission light beam and attenuate the second emission light beam into a second attenuated light beam; the fiber collimator lens is also used to couple the second attenuated light beam into the transmission optical fiber; the spectrometer is also used to determine a second measurement band according to the second attenuated light beam.

[0013] In combination with the first aspect, in an optional implementation, the system further includes: a light absorber, which is arranged opposite to the precision beacon and the signal transmitting lens. The light absorber is used to absorb the stray light of the first transmitting light beam to prevent the stray light from entering the signal receiving detector.

[0014] In combination with the first aspect, in an optional implementation, the first filtering device includes: one or more narrowband filters; the second filtering device includes: one or more narrowband filters; the third filtering device includes: one or more narrowband filters.

[0015] In the second aspect, the present invention provides a method for realizing an ultra-high isolation space laser communication light transmission and receiving circuit, comprising: first, measuring a first measurement band of a first emission light beam and a second measurement band of a second emission light beam. The first emission light beam is a light beam emitted by an optical amplifier through a fine beacon and a signal emission lens, and the second emission light beam is a light beam emitted by a laser through a coarse beacon emission lens. Then, the first filter band is determined according to the first measurement band and the first preset target wavelength, and the second filter band is determined according to the second measurement band and the second preset target wavelength. Next, the first emission light beam is filtered according to the first filter band by a first filter device, the first filtered light beam is output, and the first filtered light beam is expanded and then transmitted to a large-aperture telescope system through a Kude optical path system for transmission. The second emission light beam is filtered according to the second filter band by a second filter device, the second filtered light beam is output, and the second filtered light beam is expanded and then transmitted to a large-aperture telescope system through a Kude optical path system for transmission. The first received light beam is filtered according to the first preset target wavelength and the second preset target wavelength by the third filtering device, a third filtered light beam is output, and the third filtered light beam is transmitted to the signal receiving detector through the receiving lens.

[0016] In a third aspect, an electronic device is provided, comprising: a memory and one or more processors; the memory is coupled to the processor; wherein computer program code is stored in the memory, and the computer program code comprises computer instructions, and when the computer instructions are executed by the processor, the electronic device executes the method provided in the second aspect above.

[0017] According to a fourth aspect, a computer-readable storage medium is provided, comprising computer instructions. When the computer instructions are executed on an electronic device, the electronic device executes the method provided in the second aspect.

[0018] It can be understood that the beneficial effects that can be achieved by the method for realizing the ultra-high isolation space laser communication light transmitting and receiving circuit provided by the second aspect, the electronic device of the third aspect, and the computer-readable storage medium of the fourth aspect can be referred to the beneficial effects in the first aspect and any possible design method thereof, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a ground optical system provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the structure of a space laser communication light transmitting and receiving circuit system with ultra-high isolation provided by an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of a spectrogram provided by an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the transmitting optical path of the space laser communication light transmitting and receiving circuit system provided by the embodiment of the present invention Figure 1 ;

[0023] Figure 5 Schematic diagram of the transmitting optical path of the space laser communication light transmitting and receiving circuit system provided by the embodiment of the present invention Figure 2 ;

[0024] Figure 6 A schematic diagram of a receiving optical path of a space laser communication light receiving and transmitting circuit system provided by an embodiment of the present invention;

[0025] Figure 7 A schematic diagram of the structure of a spectrum measurement device provided by an embodiment of the present invention;

[0026] Figure 8 A flow chart of a method for implementing an ultra-high isolation space laser communication light transmitting and receiving circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0028] With the in-depth development of deep space exploration projects, new requirements have been put forward for the bandwidth of deep space communications. Compared with microwave communications, space optical communications based on lasers have the advantages of large bandwidth, high speed, high energy efficiency and spectrum authorization-free. With the development of ground-based optical fiber communication technology and the successful verification of earth orbit satellite optical communication systems, space laser communication systems have gradually become a research hotspot for deep space communications.

[0029] In the application of space laser communication systems, laser communication at ultra-long distances between the Earth, the Moon and deep space faces problems such as long communication distance and large link attenuation. Compared with the 36,000km communication distance from the ground to a high-orbit satellite, the communication distance from the ground to a lunar orbit satellite has increased by 10 times, while the received optical power at the same transmission power has attenuated by 100 times, which makes the light energy received by the on-board laser communication payload or the ground telescope extremely weak (generally at the photon level). In response to this, the ground telescope system for space laser communication at ultra-long distances between the Earth, the Moon and deep space requires a transmission power of hundreds of watts, while at the same time, the received power is at the photon level. This huge power difference requires extremely high isolation requirements for the light-receiving and light-emitting paths of the ground-side optical system, that is, when the transmitting optical path transmits an ultra-high power signal of hundreds of watts, the light energy obtained at the detector of the receiving optical path is much less than the response sensitivity of the detector. Taking the laser communication at the Earth-Moon distance as an example, its isolation requirement needs to be higher than 140dB. However, the current isolation requirement for inter-satellite or satellite-to-ground laser communications between low-orbit satellites or earth-orbit satellites is generally 90dB, which is far from the isolation requirement for deep-space laser communications.

[0030] In order to improve the isolation of the light-receiving and light-emitting paths in the optical system, in the related art 1, an optical ball or a part of a ball with a small curvature radius can be connected to one side of the center point of the optical lens to increase the reflection angle of the back-reflected light beam in the light path. In the related art 1, the reflected light from the beam splitter is eliminated by setting a reflector, a focusing lens and a black ball device, thereby reducing the influence of the emitted light on the receiving system of the communication terminal and improving the isolation of the communication terminal.

[0031] However, the first related technology increases the reflection angle of a part of the light reflected back in the optical path to reduce the probability of the backscattered light receiving the optical path, but it cannot meet the requirements for ultra-high power transmission signals. For high-power optical signal transmission, the spectral width of the second related technology is relatively wide. In addition to the emission wavelength, there are also spectra of other bands. The spectroscope and converging lens only filter out the emission wavelength or converge it and then absorb it with an absorbing black body. It cannot achieve the influence of other wavelength noise under ultra-high power transmission, and cannot meet the isolation requirements of ultra-high sensitivity detectors. It can be seen that the related technology cannot effectively improve the isolation of the light receiving and transmitting circuit of space laser communication, resulting in a low isolation of the light receiving and transmitting circuit of space laser communication, which cannot meet the application requirements.

[0032] In order to solve the above problems, the embodiments of the present application provide a space laser communication light receiving and transmitting circuit system with ultra-high isolation and an implementation method. The space laser communication light receiving and transmitting circuit system includes multiple filtering devices. The filtering devices can make the optical path transmitting end only output a light beam of the target emission wavelength and filter out light beams of other wavelengths. Among them, the filtering band of the filtering device can be determined by performing spectral analysis on the emission light beam output by the transmitting end. Moreover, at the receiving end of the optical path, the light beam of the target emission wavelength can also be filtered out by the filtering device, and only the light beam of the receiving signal wavelength is retained. In this way, the isolation of the space laser communication light receiving and transmitting circuit system can be effectively improved.

[0033] The ultra-high isolation space laser communication light receiving and transmitting circuit system and implementation method provided in the embodiment of the present application can be applied not only to the Earth-Moon and deep space ultra-long distance space laser communication systems, but also to the space laser communication systems on the ground or in the Earth orbit. Moreover, the ultra-high isolation space laser communication light receiving and transmitting circuit system and implementation method can be applied not only to the ground optical system, but also to the onboard payload. The onboard payload can further improve the isolation of the light receiving and transmitting circuit system while reducing the weight and size by using the system and implementation method.

[0034] In the following embodiments of the present application, the space laser communication light transmission and receiving circuit system and implementation method are applied to the ground optical system of the Earth-Moon and deep space ultra-long distance space laser communication system as an example for explanation. Specifically, Figure 1 A schematic diagram of the structure of a ground optical system provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the ground optical system may include: a large-aperture optical telescope 10, a rear optical path system 20, and a signal processing and detection system 30. Among them, the large-aperture optical telescope 10 can achieve high-precision line of sight pointing and tracking with the satellite laser communication terminal, and receive and transmit space optical signals. The rear optical path system 20 is located at the rear end of the large-aperture optical telescope 10 (such as in the kude room), and further reduces the beam, splits the beam, adjusts the line of sight and focuses the light beam focused by the large-aperture optical telescope 10, and also shapes and expands the emitted light beam before it is transmitted by the large-aperture optical telescope 10. The received or emitted signal light is processed by the signal processing and detection system 30. Specifically, the ultra-high isolation space laser communication light receiving and transmitting path system and implementation method provided in the embodiment of the present application can be applied to the rear optical path system and the signal processing and detection system.

[0035] The solution provided by the embodiment of the present application is introduced below in conjunction with the accompanying drawings.

[0036] Specifically, Figure 2 A schematic diagram of the structure of the ultra-high isolation space laser communication light transmitting and receiving circuit system provided by an embodiment of the present invention is shown in FIG. Figure 2As shown, the ultra-high isolation space laser communication light transmitting and receiving circuit system 100 provided in the embodiment of the present application includes: an optical amplifier 101, a fine beacon and signal transmitting lens 102, a laser 103, a coarse beacon transmitting lens 104, a signal receiving detector 105, a receiving lens 106, a first filtering device 107, a second filtering device 108 and a third filtering device 109.

[0037] The optical amplifier 101 is connected to the precision beacon and the signal transmitting lens 102, and the optical amplifier 101 is used to transmit the first transmitting light beam through the precision beacon and the signal transmitting lens 102. Specifically, the optical amplifier 101 can be an ultra-high power optical amplifier, for example, the optical amplifier 101 can be used to transmit a laser with a power greater than 30W. The first transmitting light beam can be a precision beacon light or a signal light. Since the signal light is in the near-infrared band (for example, the 1550nm band), the light in the near-infrared band needs to be modulated by the signal processor and then amplified by the optical amplifier 101 before being emitted.

[0038] The first filter device 107 can be used to filter the first emission light beam according to the first filter band, that is, to filter out the light beam of the first filter band in the first emission light beam, and output the first filtered light beam of the first preset target wavelength. The first preset target wavelength is preset according to actual application requirements. The first filter band is determined according to the first measurement band of the first emission light beam and the first preset target wavelength. Specifically, the first filter band is the difference between the first measurement band and the first preset target wavelength.

[0039] The ultra-high isolation space laser communication light transmitting and receiving circuit system 100 provided in the embodiment of the present application further includes: a spectrum measuring device. The above-mentioned first measurement band can be measured by the spectrum measuring device. Exemplarily, the spectrum measuring device can first collect the spectrum graph of the first emission light beam. Then, the first measurement band can be determined according to the spectrum graph, so as to further determine the first filter band.

[0040] For example, Figure 3 A schematic diagram of a spectrum diagram provided by an embodiment of the present invention, such as Figure 3 As shown, taking the first preset target wavelength of 1556 nm as an example, the measurement band included in the area 301 represents the band that needs to be filtered out, that is, the first filtering band.

[0041] Continue to see Figure 2The laser 103 is connected to the coarse beacon emission lens 104, and the laser 103 is used to emit a second emission light beam through the coarse beacon emission lens 104. Specifically, the laser 103 can be an ultra-high power laser, for example, the laser 103 can be used to emit a laser with a power greater than 30W. The first emission light beam can be a coarse beacon light, and since the coarse beacon light is usually in the infrared band (for example, the 808nm band), it can be directly emitted by an ultra-high power laser.

[0042] The second filter device 108 can be used to filter the second emission light beam according to the second filter band, that is, to filter out the light beam of the second filter band in the second emission light beam, and output a second filtered light beam of a second preset target wavelength. The second preset target wavelength is preset according to actual application requirements. The second filter band is determined according to the second measurement band and the second preset target wavelength of the second emission light beam. Specifically, the second filter band is the difference between the second measurement band and the second preset target wavelength.

[0043] The second measurement band can be measured by the spectrum measurement device 110. For example, the spectrum measurement device can first collect the spectrum of the second emission light beam. Further, the second measurement band can be determined according to the spectrum.

[0044] Continue to see Figure 2 , the signal receiving detector 105 is connected to the receiving lens 106. The third filtering device 109 can be used to filter the first received light beam according to the first preset target wavelength and the second preset target wavelength, that is, to filter out the light beams of the first preset target wavelength and the second preset target wavelength in the first received light beam, and output a third filtered light beam. The signal receiving detector 105 can be used to receive the third filtered light beam through the receiving lens 106.

[0045] In some embodiments, Figure 2 As shown, the ultra-high isolation space laser communication light transmission and receiving circuit system 100 provided in the embodiment of the present application further includes: a first beam splitter 111, a second beam splitter 112, a piezoelectric deflection mirror 113, a beam adjustment component 114 and a reflector 115. Among them, the first filter device 107 can be arranged between the precision beacon and signal transmission lens 102 and the first beam splitter 111.

[0046] Specifically, the first beam splitter 111, the second beam splitter 112 and the piezoelectric deflection mirror 113 can be used to transmit the first filtered light beam to the beam adjustment component 114. The beam adjustment component 114 can be used to expand the first filtered light beam into a first expanded light beam, and inject the first expanded light beam into the reflector 115. The reflector 115 can be used to transmit the first expanded light beam to the large aperture telescope system 300 via the Coode optical path system 200 for emission.

[0047] Figure 4 Schematic diagram of the transmitting optical path of the space laser communication light transmitting and receiving circuit system provided by the embodiment of the present invention Figure 1 ,like Figure 4 As shown, the optical amplifier 101 transmits the first emission light beam through the precision beacon and the signal emission lens 102. After the first emission light beam is filtered by the first filter device 107, the first filtered light beam passes through the first beam splitter 111, the second beam splitter 112 and the piezoelectric deflection mirror 113 in sequence and enters the beam adjustment component 114. After being expanded into the first expanded light beam by the beam adjustment component 114, it is emitted by the reflector 115. Finally, it is transmitted to the large-aperture telescope system 300 for emission through the Kuder optical path system 200.

[0048] In one implementation, Figure 2 and Figure 4 As shown, the beam adjustment assembly 114 may be composed of a negative lens 1141 and a positive lens 1142. The first filtered light beam is injected by the negative lens 1141 and emitted by the positive lens 1142, thus achieving beam expansion and obtaining a first expanded light beam.

[0049] In some embodiments, Figure 2 As shown, the second filtering device 108 can be arranged between the coarse beacon transmission lens 104 and the second beam splitter 112.

[0050] Specifically, the second beam splitter 112 and the piezoelectric deflection mirror 113 are also used to transmit the second filtered light beam to the beam adjustment component 114. The beam adjustment component 114 is also used to expand the second filtered light beam into a second expanded light beam, and inject the second expanded light beam into the reflector 115. The reflector 115 is used to transmit the second expanded light beam to the large-aperture telescope system 300 via the Coode optical path system 200 for emission.

[0051] Figure 5 Schematic diagram of the transmitting optical path of the space laser communication light transmitting and receiving circuit system provided by the embodiment of the present invention Figure 2 ,like Figure 5 As shown, the laser 103 emits a second emission beam through the coarse beacon emission lens 104. After the second emission beam is filtered by the second filter device 108, the second filtered beam passes through the second beam splitter 112 and the piezoelectric deflection mirror 113 in sequence and enters the beam adjustment component 114. After being expanded into a second expanded beam by the beam adjustment component 114, it is emitted by the reflector 115. Finally, it is transmitted to the large-aperture telescope system 300 for emission through the Kuder optical path system 200.

[0052] In some embodiments, Figure 2 As shown, the third filter device 109 can be arranged between the receiving lens 106 and the first beam splitter 111 .

[0053] Specifically, the reflector 115 is also used to receive the initial receiving light beam, which is received by the large-aperture telescope system 300 and transmitted through the Kuder optical path system 200. The beam adjustment component 114 is also used to shrink the initial receiving light beam into a first receiving light beam, and inject the first receiving light beam into the piezoelectric deflection mirror 113. The piezoelectric deflection mirror 113, the second beam splitter 112 and the first beam splitter 111 are also used to transmit the first receiving light beam to the third filtering device 109.

[0054] Figure 6 A schematic diagram of a receiving optical path of a space laser communication optical receiving and transmitting circuit system provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the initial receiving light beam is received by the large-aperture telescope system 300 and transmitted to the reflector 115 through the Kuder optical path system 200. The initial receiving light beam is reflected by the reflector 115 and incident into the light beam adjustment component 114. The light beam adjustment component 114 shrinks the light beam into a first receiving light beam. The first receiving light beam passes through the piezoelectric deflection mirror 113, the second beam splitter 112 and the first beam splitter 111 in sequence and incident into the third filtering device 109. After being filtered by the third filtering device 109, a third filtered light beam is output. The third filtered light beam is received by the signal receiving detector 105 through the receiving lens 106.

[0055] In one implementation, Figure 6 As shown, the beam adjustment assembly 114 may be composed of a negative lens 1141 and a positive lens 1142. The initial received beam is injected by the positive lens 1142 and emitted by the negative lens 1141, thus achieving beam contraction, thereby obtaining a first received beam after beam contraction.

[0056] In some embodiments, Figure 7 A schematic diagram of the structure of a spectrum measuring device provided by an embodiment of the present invention is shown in FIG. Figure 7 As shown in (1) and (2), the spectrum measurement device 110 includes: an attenuator 1101, a fiber collimating lens 1102 and a spectrometer 1103; the fiber collimating lens 1102 and the spectrometer 1103 are connected via a transmission optical fiber 1104.

[0057] like Figure 7 As shown in (1), the attenuator 1101 can be used to receive the first emission light beam emitted by the optical amplifier 101 through the precision beacon and the signal emission lens 102, and attenuate the first emission light beam into a first attenuated light beam. The optical fiber collimating lens 1102 is used to couple the first attenuated light beam into the transmission optical fiber 1104. The spectrometer 1103 is used to determine the first measurement band according to the first attenuated light beam.

[0058] like Figure 7As shown in (2), the attenuator 1101 can also be used to receive the second emission light beam emitted by the laser 103 through the coarse beacon emission lens 104, and attenuate the second emission light beam into a second attenuated light beam. The optical fiber collimating lens 1102 is also used to couple the second attenuated light beam into the transmission optical fiber 1104. The spectrometer 1103 is also used to determine the second measurement band according to the second attenuated light beam.

[0059] In some embodiments, Figure 2 As shown, the ultra-high isolation space laser communication light transmitting and receiving circuit system 100 provided in the embodiment of the present application also includes: a light absorber 116, and the light absorber 116 is arranged opposite to the precision beacon and the signal transmitting lens 102.

[0060] Specifically, the light absorber 116 can be used to absorb stray light of the first emission light beam to prevent the stray light from entering the signal receiving detector 105 and affecting the detection sensitivity of the signal receiving detector 105. The stray light is also stray light, for example, diffuse light of the first emission light beam.

[0061] In some embodiments, the first filter device 107 may include: one or more narrowband filters. The second filter device 108 may include: one or more narrowband filters. The third filter device 109 may include: one or more narrowband filters. That is, the first filter device 107, the second filter device 108 and the third filter device 109 may each be composed of a narrowband filter or a combination of multiple narrowband filters, wherein each narrowband filter corresponds to a filtered band.

[0062] In one implementation, after the first filter device 107, the second filter device 108, and the third filter device 109 are set, the signal receiving detector 105 can be turned on. The number of narrow-band filters in the receiving end (i.e., the third filter device 109) is adjusted according to whether the grayscale mean of the signal receiving detector 105 increases after the amplifier 101 and the laser 103 are turned on, so as to further improve the isolation of the light receiving and light transmission circuit system.

[0063] The ultra-high isolation space laser communication light transmitting and receiving circuit system provided by the embodiment of the present application is adopted, and the system includes: a spectrum measuring device and a plurality of filtering devices. Specifically, the spectrum measuring device can measure the measurement band of the light beam emitted by the transmitting end of the light path, and determine the filtering band according to the measurement band and the preset target wavelength. Furthermore, the filtering band in the transmitted light beam is filtered out by the filtering device, so that the transmitting end of the light path only outputs a light beam of the preset target wavelength and filters out light beams of other wavelengths. Moreover, the preset target wavelength in the received light beam can also be filtered out by the filtering device at the receiving end of the light path, so that the light beam of the received signal wavelength is retained. In this way, the isolation of the space laser communication light transmitting and receiving circuit system can be effectively improved.

[0064] In some embodiments, the ultra-high isolation space laser communication light transmission and receiving circuit system provided by the embodiments of the present application is used, and after testing, its isolation can reach 144dB. Compared with related technologies, the isolation can be increased by 100,000 times, that is, the maximum transmission power can reach 880W, and the power of the receiving terminal is better than 3.16e-12W.

[0065] The present application also provides a method for realizing a space laser communication light transmitting and receiving circuit with ultra-high isolation, which can be applied to Figure 2 The space laser communication light transmission and receiving circuit system shown in FIG. Figure 8 A flow chart of a method for implementing a light transmitting and receiving circuit for ultra-high isolation space laser communication provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, the method includes the following steps S101-S105:

[0066] S101 , measuring a first measurement band of a first emission light beam and a second measurement band of a second emission light beam.

[0067] The first emission light beam is a light beam emitted by the optical amplifier through the fine beacon and the signal emission lens, and the second emission light beam is a light beam emitted by the laser through the coarse beacon emission lens.

[0068] S102: Determine a first filtering band according to the first measuring band and the first preset target wavelength, and determine a second filtering band according to the second measuring band and the second preset target wavelength.

[0069] Specifically, the first filtering band is the difference between the first measuring band and the first preset target wavelength, and the second filtering band is the difference between the second measuring band and the second preset target wavelength.

[0070] S103, filtering the first emission light beam according to the first filtering band by the first filtering device, outputting the first filtered light beam, and transmitting the first filtered light beam to the large aperture telescope system through the Coode optical path system for emission after beam expansion.

[0071] S104, filtering the second emission light beam according to the second filtering band by the second filtering device, outputting the second filtered light beam, and transmitting the second filtered light beam to the large aperture telescope system through the Coode optical path system for emission after beam expansion.

[0072] S105 , filtering the first received light beam according to the first preset target wavelength and the second preset target wavelength by a third filtering device, outputting a third filtered light beam, and transmitting the third filtered light beam to the signal receiving detector through a receiving lens.

[0073] The method for realizing the ultra-high isolation space laser communication light transmission and receiving circuit provided by the embodiment of the present application is adopted. The method: first, the measurement band of the light beam emitted by the light path transmitting end can be measured, and the filter band can be determined according to the measurement band and the preset target wavelength. Then, the filter band in the transmitted light beam is filtered out by the filter device, so that the light path transmitting end only outputs the light beam of the preset target wavelength and filters out the light beams of other wavelengths. Moreover, for the light path receiving end, the preset target wavelength in the received light beam can also be filtered out by the filter device, so that the light beam of the received signal wavelength is retained. In this way, the isolation of the space laser communication light transmission and receiving circuit system can be effectively improved.

[0074] An embodiment of the present invention further provides an electronic device, which may include: a display screen, a memory, and one or more processors. The display screen, the memory, and the processor are coupled. The memory is used to store computer program code, and the computer program code includes computer instructions. When the processor executes the computer instructions, the electronic device can execute the various methods or steps executed in the above-mentioned ultra-high isolation space laser communication light receiving and transmitting circuit implementation method embodiment. Of course, the electronic device includes but is not limited to the above-mentioned display screen, memory, and one or more processors.

[0075] An embodiment of the present invention also provides a computer-readable storage medium for storing computer instructions for running the above-mentioned method for implementing the ultra-high isolation space laser communication light transmitting and receiving circuit.

[0076] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0077] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0078] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0080] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A space laser communication light transmission and receiving circuit system with ultra-high isolation, characterized in that: include: Optical amplifier, fine beacon and signal transmitting lens, laser, coarse beacon transmitting lens, signal receiving detector, receiving lens, first filter device, second filter device, third filter device and spectrum measuring device; Wherein, the optical amplifier is connected to the precision beacon and the signal transmission lens, and the optical amplifier is used to transmit a first transmission light beam through the precision beacon and the signal transmission lens, and the first filtering device is used to filter the first transmission light beam according to a first filtering band, and output a first filtered light beam of a first preset target wavelength; wherein, the first filtering band is determined according to a first measurement band of the first transmission light beam and the first preset target wavelength, and the first measurement band is measured by the spectrum measurement device; The laser is connected to the coarse beacon emission lens, the laser is used to emit a second emission light beam through the coarse beacon emission lens, and the second filter device is used to filter the second emission light beam according to a second filter band, and output a second filtered light beam of a second preset target wavelength; wherein the second filter band is determined according to a second measurement band of the second emission light beam and the second preset target wavelength, and the second measurement band is measured by the spectrum measurement device; The signal receiving detector is connected to the receiving lens, the third filtering device is used to filter the first received light beam according to the first preset target wavelength and the second preset target wavelength, and output a third filtered light beam, and the signal receiving detector is used to receive the third filtered light beam through the receiving lens.

2. The system according to claim 1, characterized in that The system further comprises: a first beam splitter, a second beam splitter, a piezoelectric deflection mirror, a beam adjustment assembly and a reflector; wherein the first filter device is arranged between the precision beacon and the signal transmission lens and the first beam splitter; The first beam splitter, the second beam splitter and the piezoelectric deflection mirror are used to transmit the first filtered light beam to the beam adjustment component; The beam adjustment component is used to expand the first filtered light beam into a first expanded light beam, and inject the first expanded light beam into the reflector; The reflector is used to transmit the first expanded beam to the large-aperture telescope system via the Coode optical path system for emission.

3. The system according to claim 2, characterized in that The second filter device is arranged between the coarse beacon emission lens and the second beam splitter; The second beam splitter and the piezoelectric deflection mirror are also used to transmit the second filtered light beam to the beam adjustment component; The beam adjustment component is also used to expand the second filtered light beam into a second expanded light beam, and inject the second expanded light beam into the reflector; The reflector is used to transmit the second expanded beam through the Coode optical path system to the large-aperture telescope system for emission.

4. The system according to claim 2 or 3, characterized in that: The third filter device is arranged between the receiving lens and the first beam splitter; The reflector is also used to receive an initial receiving light beam, which is received by the large-aperture telescope system and transmitted through the Kuder optical path system; The beam adjustment component is also used to shrink the initial received beam into a first received beam, and inject the first received beam into the piezoelectric deflection mirror; The piezoelectric deflection mirror, the second beam splitter and the first beam splitter are further used to transmit the first received light beam to the third filtering device.

5. The system according to claim 1, characterized in that The spectrum measurement device comprises: an attenuator, a fiber collimating lens and a spectrometer; the fiber collimating lens is connected to the spectrometer via a transmission optical fiber; The attenuator is used to receive the first emission light beam and attenuate the first emission light beam into a first attenuated light beam; The optical fiber collimating lens is used to couple the first attenuated light beam into the transmission optical fiber; The spectrometer is used to determine the first measurement band according to the first attenuated light beam; The attenuator is also used to receive the second emission light beam and attenuate the second emission light beam into a second attenuated light beam; The optical fiber collimating lens is also used to couple the second attenuated light beam into the transmission optical fiber; The spectrometer is further configured to determine the second measurement band according to the second attenuated light beam.

6. The system according to claim 1, characterized in that The system further comprises: a light absorber, the light absorber being arranged opposite to the precision beacon and the signal transmitting lens; The light absorber is used to absorb stray light of the first emission light beam to prevent the stray light from entering the signal receiving detector.

7. The system according to claim 1, characterized in that The first filtering device includes: one or more narrow-band filters; the second filtering device includes: one or more narrow-band filters; the third filtering device includes: one or more narrow-band filters.

8. A method for realizing a space laser communication light transmission and receiving circuit with ultra-high isolation, characterized in that: include: Measuring a first measurement band of a first emission light beam and a second measurement band of a second emission light beam, wherein the first emission light beam is a light beam emitted by an optical amplifier through a fine beacon and a signal emission lens, and the second emission light beam is a light beam emitted by a laser through a coarse beacon emission lens; Determine a first filtering band according to the first measuring band and a first preset target wavelength, and determine a second filtering band according to the second measuring band and a second preset target wavelength; The first emission light beam is filtered according to the first filter band by a first filter device to output a first filtered light beam, and the first filtered light beam is expanded and transmitted to a large-aperture telescope system through a Coode optical path system for emission; The second emission light beam is filtered according to the second filter band by a second filter device, a second filtered light beam is output, and the second filtered light beam is expanded and transmitted to the large-aperture telescope system through the Coode optical path system for emission; The first received light beam is filtered according to the first preset target wavelength and the second preset target wavelength by a third filtering device, a third filtered light beam is output, and the third filtered light beam is transmitted to the signal receiving detector through a receiving lens.

9. An electronic device, characterized in that: include: A memory, one or more processors; the memory is coupled to the processor; wherein the memory stores computer program code, the computer program code includes computer instructions, and when the computer instructions are executed by the processor, the electronic device executes the method as claimed in claim 8.

10. A computer-readable storage medium, characterized in that: The method comprises computer instructions, which, when executed on an electronic device, cause the electronic device to execute the method as claimed in claim 8.

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