Signal light polarization multiplexing inter-satellite laser communication transmitting system

Abstract

The invention discloses an inter-satellite laser communication transmitting system for signal light polarization multiplexing, and relates to the technical field of satellite laser communication. Comprising a coarse tracking adjustment mechanism, a fine tracking adjustment mechanism, a 1 / 4 wave plate, a spectrum optical splitter, an advance angle adjustment mechanism, a transmitting beacon signal laser system, a receiving signal beacon detection system, a wave plate and a pyramid. The transmitting beacon signal laser system comprises a polarization optical splitter I, a signal collimator, a linear polarization signal laser, a half-wave plate, a signal collimator and a linear polarization beacon laser; the received signal beacon detection system comprises a polarization beam splitter II, a beacon detector, a reflector and a signal detector; according to the inter-satellite laser communication transmitting system for signal light polarization multiplexing, the wavelengths and the linear polarization states of the transmitted signal light and the beacon light are the same, the polarization states are modulated, the effect of signal light polarization multiplexing is achieved, separation of the signal light and the beacon light is achieved, the complexity of the system is effectively reduced, and meanwhile the reliability and efficiency of link establishment are improved.

Description

Technical Field

[0001] The invention relates to the technical field of satellite laser communication, and specifically to an inter-satellite laser communication transmission system with signal light polarization multiplexing. Background Art

[0002] In the intersatellite laser communication system, the capture and link establishment technology is a key step in realizing laser communication between satellite terminals. Its function is to establish the communication link between different satellite communication terminals for the first time, and to eliminate the link interruption problem in time and restore the link for re-linking. In the process of communication link establishment, two different satellite communication terminals achieve it by scanning and capturing lasers. The whole process requires both emitting and receiving lasers.

[0003] There are currently two capture schemes:

[0004] The first scheme is a beacon-free optical scanning capture scheme;

[0005] The second solution is a scanning capture solution that combines beacon light and signal light.

[0006] The intersatellite laser communication system without beacon does not need additional beacon light source and corresponding control system, which reduces the complexity and cost of the system. However, because it directly uses small beam divergent signal light for scanning and capture, it is very easy to cause insufficient signal strength at the receiving end under the interference of high background noise field, thus affecting the efficiency of capture and tracking. The intersatellite laser communication system with beacon can quickly and accurately capture and track the target under the interference of high background light by using beacon light source.

[0007] However, in the traditional beacon transmission system, the signal light and the beacon light use different wavelengths, which increases the complexity of the optical system and the installation schedule, especially the film system design is more complicated and the cost is higher.

[0008] How to simplify the structure of the intersatellite laser communication transmission system while reducing the complexity of the optical system and improving the system's anti-interference ability, so as to achieve rapid and accurate capture and tracking of targets under high background light interference, is an urgent problem that needs to be solved in the current intersatellite laser communication system.

[0009] Therefore, a signal light polarization multiplexing intersatellite laser communication transmission system is proposed to solve the above problems. Summary of the invention

[0010] The invention provides an inter-satellite laser communication transmission system with polarization multiplexing of signal light to solve the problems in the background technology.

[0011] To achieve the above-mentioned purpose, the invention provides the following technical solutions: an intersatellite laser communication transmission system with polarization multiplexing of signal light, comprising a coarse tracking adjustment mechanism, a fine tracking adjustment mechanism, a 1 / 4 wave plate, a spectrum splitter, an advance angle adjustment mechanism, a transmitting beacon signal laser system, a receiving signal beacon detection system, a wave plate and a cone; the transmitting beacon signal laser system comprises a polarization splitter 1, a signal collimator, a linearly polarized signal laser, a half-wave plate, a signal collimator and a linearly polarized beacon laser; the receiving signal beacon detection system comprises a polarization splitter 2, a beacon detector, a reflector and a signal detector.

[0012] Furthermore, in the transmitting system, the linearly polarized signal laser emits a linearly polarized signal light P 信号 After passing through the signal collimator, the light beam is collimated into parallel light, and then transmitted through the polarization beam splitter 1; the linear polarization beacon laser emits the linear polarization beacon light P 信标 After passing through the beacon collimator, the light beam is collimated into parallel light, and then modulated by a half-wave plate into a beacon light S perpendicular to the original linear polarization direction. 信标 , and then reflected through spectrum splitter 1.

[0013] Furthermore, the linearly polarized signal light P 信号 and linearly polarized beacon light S 信标 The linear polarization directions are perpendicular to each other and have the same wavelength.

[0014] Furthermore, P 信号 and S 信标 At the same time, after being reflected by the advance angle adjustment mechanism, a very small part of the light is reflected through the polarization beam splitter, and after being modulated by the wave plate transmission and the angle cone reflection, it is transmitted again through the wave plate modulation and becomes S perpendicular to the original linear polarization state direction. 信号 and P 信标 , and then transmits through the polarization splitter and enters the receiving signal beacon detection system.

[0015] Furthermore, P 信标 After passing through the second polarization beam splitter, it enters the beacon detector to calibrate the beacon light. 信号 After being reflected by the polarization beam splitter and the reflector, it enters the signal detector to calibrate the signal light.

[0016] Furthermore, P 信号 and S 信标 At the same time, after being reflected by the advance angle adjustment mechanism, most of the light is transmitted through the polarization splitter. After being modulated by the 1 / 4 wave plate, the polarization states of the signal light and the beacon light become left-handed circularly polarized light and right-handed circularly polarized light, and then pass through the fine tracking adjustment mechanism and the coarse tracking adjustment mechanism and are transmitted to the receiving system.

[0017] Furthermore, the linear polarization states of the linear polarization signal laser and the linear polarization beacon laser are the same, and can be either P light or S light, and the wavelengths of the two are the same.

[0018] Furthermore, the reflector is a device that can reflect light; and the signal standard collimator has a focusing function.

[0019] Furthermore, the coarse tracking adjustment mechanism refers to an adjustment mechanism that can perform scanning control on the light beam within a certain range, and can be any one of a voice coil motor reflector, a piezoelectric ceramic reflector, and a horizontal adjustment mechanism.

[0020] Furthermore, the signal collimator and signal standard collimator refer to devices that collimate light beams into parallel light beams, and may be either a transmission type structure or a reflection type structure.

[0021] Compared with the prior art, the invention provides an inter-satellite laser communication transmission system with polarization multiplexing of signal light, which has the following beneficial effects:

[0022] The intersatellite laser communication transmission system with polarization multiplexing of signal light has the same wavelength and linear polarization state for the transmitted signal light and beacon light. By modulating the polarization state, the effect of polarization multiplexing of signal light is achieved, and the separation of signal light and beacon light is realized, which effectively reduces the complexity of the system and improves the reliability and efficiency of link establishment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0024] Figure 1 A schematic diagram of an intersatellite laser communication transmission system for inventing polarization multiplexing of signal light;

[0025] Figure 2 The present invention is a signal / beacon flow chart of an intersatellite laser communication transmission system with polarization multiplexing of signal light.

[0026] In the figure: 1. coarse tracking adjustment mechanism; 2. fine tracking adjustment mechanism; 3. 1 / 4 wave plate; 4. spectral splitter; 5. advance angle adjustment mechanism; 6. transmitting beacon signal laser system; 61. polarization splitter 1; 62. signal collimator; 63. linearly polarized signal laser; 64. half-wave plate; 65. signal collimator; 66. linearly polarized beacon laser; 7. receiving signal beacon detection system; 71. polarization splitter 2; 72. beacon detector; 73. reflector; 74. signal detector; 8. wave plate; 9. angle cone. DETAILED DESCRIPTION

[0027] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0028] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0030] See also Figure 1-2 The invention discloses an intersatellite laser communication transmitting system for polarization multiplexing of signal light, comprising a coarse tracking adjustment mechanism 1, a fine tracking adjustment mechanism 2, a 1 / 4 wave plate 3, a spectral splitter 4, an advance angle adjustment mechanism 5, a transmitting beacon signal laser system 6, a receiving signal beacon detection system 7, a wave plate 8 and a cone 9; the transmitting beacon signal laser system 6 comprises a polarization splitter 1 61, a signal collimator 62, a linearly polarized signal laser 63, a half-wave plate 64, a signal collimator 65 and a linearly polarized beacon laser 66; the receiving signal beacon detection system 7 comprises a polarization splitter 2 71, a beacon detector 72, a reflector 73 and a signal detector 74. The wavelength and linear polarization state of the transmitting signal light and the beacon light of the present invention are the same. The polarization wave plate and the polarization splitter are used to achieve the effect of polarization multiplexing of the signal light and realize the separation of the signal light and the beacon light.

[0031] The intersatellite laser communication transmission system with polarization multiplexing of signal light has the same wavelength and linear polarization state for the transmitted signal light and beacon light. By modulating the polarization state, the effect of polarization multiplexing of signal light is achieved, and the separation of signal light and beacon light is realized, which effectively reduces the complexity of the system and improves the reliability and efficiency of link establishment.

[0032] Specifically, in the transmitting system, the linear polarization signal laser 63 emits a linear polarization signal light P 信号 After passing through the signal collimator 62, the light beam is collimated into parallel light, and then transmitted through the polarization beam splitter 61; the linear polarization beacon laser 65 emits a linear polarization beacon light P信标 After passing through the beacon collimator 64, the light beam is collimated into parallel light, and then modulated into the beacon light S perpendicular to the original linear polarization direction by the half-wave plate 64. 信标 , and then reflected through a spectrum splitter 61;

[0033] Specifically, the linearly polarized signal light P 信号 and linearly polarized beacon light S 信标 The linear polarization directions are perpendicular to each other and have the same wavelength.

[0034] Specifically, P 信号 and S 信标 At the same time, after being reflected by the advance angle adjustment mechanism 5, a very small part of the light is reflected through the polarization beam splitter 4, and after being transmitted and modulated by the wave plate 8 and reflected by the angle cone 9, it is transmitted and modulated by the wave plate 8 again, and becomes S perpendicular to the original linear polarization state direction. 信号 and P 信标 , then transmits through the polarization beam splitter 4 and enters the receiving signal beacon detection system 7; where P 信标 After passing through the second polarization beam splitter 71, it enters the beacon detector 72 to calibrate the beacon light. 信号 After being reflected by the second polarization beam splitter 71 and the reflector 73, the light enters the signal detector 74 to achieve calibration of the signal light.

[0035] Specifically, P 信号 and S 信标 At the same time, after being reflected by the advance angle adjustment mechanism 5, most of the light is transmitted through the polarization splitter 4. After being modulated by the 1 / 4 wave plate 3, the polarization states of the signal light and the beacon light become left-handed circularly polarized light (signal) and right-handed circularly polarized light (beacon), and then pass through the fine tracking adjustment mechanism 2 and the coarse tracking adjustment mechanism 1 and are emitted to the receiving system.

[0036] Specifically, the linear polarization states of the linear polarization signal laser 63 and the linear polarization beacon laser 66 are the same, and can be either P light or S light, and the wavelengths of the two are the same.

[0037] Specifically, the reflector 73 is a device capable of reflecting light; and the signal standard collimator 65 has a focusing function.

[0038] Specifically, the coarse tracking adjustment mechanism 1 refers to an adjustment mechanism that can perform scanning control on a light beam within a certain range, and can be any one of a voice coil motor reflector, a piezoelectric ceramic reflector, and a horizontal adjustment mechanism.

[0039] Specifically, the signal collimator 62 and the signal collimator 65 refer to devices for collimating light beams into parallel light beams, and may be either a transmission type structure or a reflection type structure.

[0040] When in use: the linear polarization signal laser 63 is used to emit the linear polarization signal light P 信号 After being irradiated by the signal collimator 62, the light beam is collimated into parallel light, and then the parallel light is transmitted through the polarization beam splitter 61; the linear polarization beacon laser 65 is used to emit the linear polarization beacon light P 信标 After the beacon light passes through the beacon collimator 64, the light beam is collimated into parallel light, and then modulated into the beacon light S perpendicular to the original linear polarization direction by the half-wave plate 64. 信标 , the beacon light is emitted through a spectrum splitter 61;

[0041] The linearly polarized signal light P of the present invention 信号 and linearly polarized beacon light S 信标 The linear polarization directions are perpendicular to each other, the wavelengths are the same, P 信号 and S 信标 At the same time, the advance angle adjustment mechanism 5 is used for reflection, and a small part of the light is reflected through the polarization beam splitter 4, and after being transmitted and modulated by the wave plate 8 and reflected by the angle cone 9, it is transmitted and modulated by the wave plate 8 again, and becomes S perpendicular to the original linear polarization state direction. 信号 and P 信标 , then transmits through the polarization beam splitter 4 and enters the receiving signal beacon detection system 7; P 信标 After passing through the second polarization beam splitter 71, it enters the beacon detector 72 to calibrate the beacon light. 信号 After being reflected by the second polarization beam splitter 71 and the reflector 73, the light enters the signal detector 74 to achieve calibration of the signal light.

[0042] In summary, the inter-satellite laser communication transmitting system with polarization multiplexing of signal light has the same wavelength and linear polarization state for transmitting signal light and beacon light. By modulating the polarization state, the effect of polarization multiplexing of signal light is achieved, and the separation of signal light and beacon light is realized, which effectively reduces the complexity of the system and improves the reliability and efficiency of link establishment.

[0043] 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.

[0044] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An intersatellite laser communication transmission system with polarization multiplexing of signal light, characterized in that: The invention comprises a coarse tracking adjustment mechanism (1), a fine tracking adjustment mechanism (2), a quarter wave plate (3), a spectrum splitter (4), an advance angle adjustment mechanism (5), a transmitting beacon signal laser system (6), a receiving signal beacon detection system (7), a wave plate (8) and a cone (9); the transmitting beacon signal laser system (6) comprises a polarization beam splitter 1 (61), a signal collimator (62), a linearly polarized signal laser (63), a half-wave plate (64), a signal collimator (65) and a linearly polarized beacon laser (66); the receiving signal beacon detection system (7) comprises a polarization beam splitter 2 (71), a beacon detector (72), a reflector (73) and a signal detector (74).

2. According to claim 1, a signal light polarization multiplexing inter-satellite laser communication transmission system is characterized in that: In the transmitting system, the linear polarization signal laser (63) emits a linear polarization signal light P 信号 After passing through the signal collimator (62), the light beam is collimated into parallel light and then transmitted through the polarization beam splitter (61); the linear polarization beacon laser (65) emits linear polarization beacon light P 信标 After passing through the beacon collimator (64), the light beam is collimated into parallel light, and then modulated into a beacon light S perpendicular to the original linear polarization direction through a half-wave plate (64). 信标 , and then reflected through spectrum splitter one (61).

3. The inter-satellite laser communication transmission system with polarization multiplexing of signal light according to claim 2, characterized in that: The linearly polarized signal light P 信号 and linearly polarized beacon light S 信标 The linear polarization directions are perpendicular to each other and have the same wavelength.

4. The inter-satellite laser communication transmission system with polarization multiplexing of signal light according to claim 3 is characterized in that: P 信号 and S 信标 At the same time, after being reflected by the advance angle adjustment mechanism (5), a very small portion of the light is reflected through the polarization beam splitter (4), modulated by the wave plate (8) and reflected by the angle cone (9), and then modulated by the wave plate (8) again to become an S polarization state perpendicular to the original linear polarization state direction. 信号 and P 信标 , then transmitted through the polarization beam splitter (4) and enters the receiving signal beacon detection system (7).

5. The inter-satellite laser communication transmission system with polarization multiplexing of signal light according to claim 4, characterized in that: Where P 信标 After passing through the second polarization beam splitter (71), it enters the beacon detector (72) to calibrate the beacon light. 信号 After being reflected by the second polarization beam splitter (71) and the reflector (73), the light enters the signal detector (74) to achieve calibration of the signal light.

6. The inter-satellite laser communication transmission system with polarization multiplexing of signal light according to claim 5, characterized in that: P 信号 and S 信标 At the same time, after being reflected by the advance angle adjustment mechanism (5), most of the light is transmitted through the polarization beam splitter (4), and after being modulated by the 1 / 4 wave plate (3), the polarization states of the signal light and the beacon light are changed into left-handed circularly polarized light and right-handed circularly polarized light, and then passed through the fine tracking adjustment mechanism (2) and the coarse tracking adjustment mechanism (1) to be emitted to the receiving system.

7. The inter-satellite laser communication transmission system with polarization multiplexing of signal light according to claim 1, characterized in that: The linear polarization states of the linear polarization signal laser (63) and the linear polarization beacon laser (66) are the same, and can be either P light or S light, and the wavelengths of the two are the same.

8. The inter-satellite laser communication transmission system with polarization multiplexing of signal light according to claim 1, characterized in that: The reflector (73) is a device capable of reflecting light; and the signal standard collimator (65) has a focusing function.

9. The inter-satellite laser communication transmission system with polarization multiplexing of signal light according to claim 1, characterized in that: The coarse tracking adjustment mechanism (1) refers to an adjustment mechanism that can perform scanning control on a light beam within a certain range, and can be any one of a voice coil motor reflector, a piezoelectric ceramic reflector, and a horizontal adjustment mechanism.

10. The inter-satellite laser communication transmission system with polarization multiplexing of signal light according to claim 1, characterized in that: The signal collimator (62) and the signal standard collimator (65) refer to devices for collimating light beams into parallel light beams, and may be either a transmission type structure or a reflection type structure.

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