A full-duplex laser communication system and method based on dual-wavelength separation

Abstract

This invention discloses a full-duplex laser communication system and method based on dual-wavelength separation, including a terminal 1 and a terminal 2. The full-duplex laser communication system body has signals transmitted from terminal 1 to terminal 2 modulated at a wavelength of 1310 nm. Through ingenious optical design, the full-duplex laser communication system body uses a single optical antenna for both transmission and reception, significantly reducing terminal size, weight, and power consumption. The use of different wavelengths for reception and transmission ensures no interference, resulting in strong system stability. The symmetrical system design reduces production and calibration costs. The wavelength separation scheme has a clear principle and a well-defined engineering implementation path. The two terminals use the same structural design, greatly reducing design and production costs.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, specifically to a full-duplex laser communication system and method based on dual-wavelength separation. Background Technology

[0002] Free-space laser communication is a key technology for achieving high-speed, secure wireless transmission, and its link efficiency can be greatly improved by realizing full-duplex communication. However, realizing full-duplex laser communication faces a core challenge: how to suppress crosstalk caused by the strong optical signal emitted by the laser itself to the receiving end while sharing the same optical antenna.

[0003] Current mainstream solutions all have significant limitations: spatial separation schemes using independent transmit and receive optical systems are bulky, heavy, and difficult to calibrate; time-division multiplexing schemes using alternating transmit and receive have low effective rates and complex timing; and schemes using orthogonal polarization and co-wavelength isolation have limited isolation and insufficient reliability. Existing technologies struggle to achieve a balance between "system compactness," "high isolation," and "full-duplex continuity." Therefore, there is an urgent need to develop a new solution that can achieve reliable full-duplex communication while sharing the same optical antenna to address this problem in existing technologies. Summary of the Invention

[0004] The purpose of this invention is to provide a full-duplex laser communication system and method based on dual-wavelength separation, which solves the problems mentioned in the background art by using a single optical antenna for both transmitting and receiving through ingenious optical design, significantly reducing the size, weight and power consumption of the terminal, using different wavelengths for receiving and transmitting to avoid interference, resulting in strong system stability, and reducing production and calibration costs through symmetrical system design. The wavelength separation scheme has a clear principle and a well-defined engineering implementation path. The two terminals adopt the same structural design, which greatly reduces design and production costs.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a full-duplex laser communication system based on dual-wavelength separation, comprising a full-duplex laser communication system body, wherein the full-duplex laser communication system body is provided with a terminal one and a terminal two, wherein the signal sent by the terminal one to the terminal two is modulated on a wavelength of 1310nm, and the signal sent by the terminal one to the terminal two is modulated on a wavelength of 1310nm. The terminal is equipped with a fast reflector A, a dichroic mirror A, a bandpass filter, a beam splitter A, and a high reflector A, all of which are arranged in the same vertical direction. The second terminal is equipped with a fast reflector B, a dichroic mirror B, a filter, a beam splitter B, and a high reflector B, all of which are arranged in the same vertical direction.

[0006] Preferably, the dichroic mirror A is coated with a 1310nm high-reflectivity film and a 1550nm high-transmittance film.

[0007] Preferably, the right side of the high-reflectivity mirror A on the terminal is provided with a 4QPD (four-quadrant photodetector) converging lens group and a 4QPDa; the left side of the beam splitter A is provided with an RX lens group A on the optical fiber B; the left side of the dichroic mirror A is provided with an incoming optical fiber A, and an TX lens group A is provided on the incoming optical fiber A; the right side of the fast-reflectivity mirror A is provided with an optical antenna A in the horizontal direction; and the other connection end of the fast-reflectivity mirror A is provided with a computer A.

[0008] Preferably, the high-reflection mirror B on the second terminal has a high-reflection group B and 4QPDb on its left side, the optical fiber B on the right side of the beam splitter B has an RX mirror group B, the dichroic mirror B has an incoming optical fiber B on its right side, and an TX mirror group B is provided on the incoming optical fiber B, the fast-reflection mirror B has an optical antenna B in the horizontal direction on its left side, and the other connection end of the fast-reflection mirror B has a computer A.

[0009] Preferably, the bandpass filter has a center wavelength of 1550nm.

[0010] Preferably, the dichroic mirror B is coated with a 1550nm high-reflectivity film and a 1310nm high-transmittance film.

[0011] Preferably, the filter is a bandpass filter with a center wavelength of 1310 nm.

[0012] Preferably, a communication method for a full-duplex laser communication system based on dual-wavelength separation includes the following steps: In Terminal 1, the 1310nm signal light is emitted through fiber A. After being parallelized by the TX mirror group A, it is directed to the dichroic mirror A, reflected again by the fast reflector A, and enters the optical antenna A. The 1550nm signal light received by the optical antenna A is reflected by the fast reflector A and the dichroic mirror A, and then passes through the bandpass filter (center wavelength 1550nm) and is directed to the beam splitter A (7:3 = reflection: transmission). 70% of the light is reflected to the RX mirror group A and coupled into fiber B, while 30% of the light is reflected by the high-reflection mirror A and enters the 4QPD (four-quadrant photodetector) converging mirror group. The 4QPD (four-quadrant photodetector) converging mirror group converges the light onto 4QPDa. The 4QPD (four-quadrant photodetector) converging mirror group is used to determine the beam deflection, and computer A controls the fast reflector.

[0013] Compared with the prior art, the beneficial effects of the present invention are: The full-duplex laser communication system features a sophisticated optical design that uses a single optical antenna for both transmission and reception, significantly reducing terminal size, weight, and power consumption. The system employs different wavelengths for reception and transmission, ensuring no interference and strong system stability. The symmetrical system design also reduces production and calibration costs. The wavelength separation scheme has a clear principle and a well-defined engineering implementation path. The two terminals use the same structural design, which greatly reduces design and production costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the second terminal structure of the present invention; Figure 2 This is a schematic diagram of the structure of terminal one of the present invention; Figure 3 This is a schematic diagram of the structure of terminal two of the present invention.

[0015] In the diagram: 101. Optical antenna A; 102. Computer A; 103. Fast-reflecting mirror A; 104. Dichroic mirror A; 105. TX mirror group A; 106. Fiber optic cable A; 107. Bandpass filter; 108. Beam splitter A; 109. RX mirror group A; 110. Fiber optic cable B; 111. High-reflection mirror A; 112. 4QPD (four-quadrant photodetector) converging mirror group; 113. 4QPDa; 201. 202. Optical antenna B; 203. Computer B; 204. Fast reflector B; 205. Dichroic mirror B; 206. TX mirror group B; 207. Optical fiber; 208. Filter; 209. Beam splitter B; 210. RX mirror group B; 211. Fiber optic cable B; 212. High-reflection mirror B; 213. Mirror group B; 214. 4QPDb; 301. Terminal 1; 302. Terminal 2; 4. Full-duplex laser communication system body. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-3 The present invention provides a technical solution: a full-duplex laser communication system based on dual-wavelength separation, including a full-duplex laser communication system body 4, on which a terminal 1 301 and a terminal 2 302 are provided. The signal sent by the terminal 1 301 to the terminal 2 302 is modulated on a wavelength of 1310nm, thereby realizing full-duplex communication.

[0018] Terminal 301 is equipped with a fast reflector A103, a dichroic mirror A104, a bandpass filter 107, a beam splitter A108, and a high reflector A111. The fast reflector A103, dichroic mirror A104, bandpass filter 107, beam splitter A108, and high reflector A111 are arranged in the same vertical direction. The dichroic mirror A104 is coated with a 1310nm high reflectivity film and a 1550nm high transmittance film. The bandpass filter 107 is a bandpass filter with a center wavelength of 1550nm.

[0019] On the right side of the high-reflectivity mirror A111 on terminal 301, there are 4QPD four-quadrant photodetector converging lens group 112 and 4QPDa113. On the left side of the beam splitter A108, there is an RX lens group A109 on the optical fiber B110. On the left side of the dichroic mirror A104, there is an incoming optical fiber A106, and an TX lens group A105 is fitted on the incoming optical fiber A106. On the right side of the fast-reflectivity mirror A103, there is an optical antenna A101 in the horizontal direction. On the other end of the fast-reflectivity mirror A103, there is a computer A102.

[0020] Terminal 2 302 is equipped with a fast reflector B203, a dichroic mirror B204, a filter 207, a beam splitter B208, and a high reflector B211. The fast reflector B203, dichroic mirror B204, filter 207, beam splitter B208, and high reflector B211 are arranged in the same vertical direction. The dichroic mirror B204 is coated with a 1550nm high reflectivity film and a 1310nm high transmittance film. The filter 207 is a bandpass filter with a center wavelength of 1310nm.

[0021] On the left side of the high-reflection mirror B211 on terminal 2 302, there are high-reflection groups B212 and 4QPDb213. On the right side of the beam splitter B208, there is an RX mirror group B209 on the optical fiber B210. On the right side of the dichroic mirror B204, there is an incoming optical fiber B206, and an TX mirror group B205 is installed on the incoming optical fiber B206. On the left side of the fast-reflection mirror B203, there is an optical antenna B201 in the horizontal direction. On the other end of the fast-reflection mirror B203, there is a computer A202.

[0022] Communication method based on dual-wavelength separation full-duplex laser communication system: In terminal 301, the 1310nm signal light is emitted through optical fiber A106, and after being parallelized by the TX mirror group A105, it is directed to the dichroic mirror A104, reflected again by the fast reflector A103, and enters the optical antenna A101. The 1550nm signal light received by the optical antenna A101 is reflected by the fast reflector A103 and the dichroic mirror A104, and then passes through the bandpass filter 10. 7. The light with a center wavelength of 1550nm is directed towards the beam splitter A1087:3 = reflection: transmission. 70% of the light is reflected to the RX mirror group A109 and coupled into the optical fiber B110. 30% of the light is reflected by the high-reflection mirror A111 and enters the 4QPD four-quadrant photodetector converging mirror group 112. The 4QPD four-quadrant photodetector converging mirror group 112 converges onto the 4QPDa113. The 4QPD four-quadrant photodetector converging mirror group 112 is used to determine the beam deflection. The computer A102 controls the fast-reflection mirror.

[0023] The full-duplex laser communication system body 4 uses a sophisticated optical design to share a single optical antenna for both transmission and reception, which significantly reduces the size, weight, and power consumption of the terminal. The receiving and transmitting use different wavelengths, so they do not interfere with each other, resulting in strong system stability. The symmetrical system design reduces production and calibration costs. The wavelength separation scheme has a clear principle and a well-defined engineering implementation path. The two terminals use the same structural design, which greatly reduces design and production costs.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A full-duplex laser communication system based on dual-wavelength separation, comprising a full-duplex laser communication system body (4), characterized in that: The full-duplex laser communication system body (4) is provided with terminal one (301) and terminal two (302). The signal sent by terminal one (301) to terminal two (302) is modulated at a wavelength of 1310nm. The terminal (301) is equipped with a fast reflector A (103), a dichroic mirror A (104), a bandpass filter (107), a beam splitter A (108), and a high reflector A (111). The fast reflector A (103), the dichroic mirror A (104), the bandpass filter (107), the beam splitter A (108), and the high reflector A (111) are arranged in the same vertical direction. The terminal 2 (302) is provided with a fast reflector B (203), a dichroic mirror B (204), a filter (207), a beam splitter B (208), and a high reflector B (211). The fast reflector B (203), the dichroic mirror B (204), the filter (207), the beam splitter B (208), and the high reflector B (211) are arranged in the same vertical direction.

2. The full-duplex laser communication system based on dual-wavelength separation according to claim 1, characterized in that: The dichroic mirror A (104) is coated with a 1310nm high-reflectivity film and a 1550nm high-transmittance film.

3. The full-duplex laser communication system based on dual-wavelength separation according to claim 1, characterized in that: On the right side of the high-reflection mirror A (111) of the terminal (301), there is a 4QPD (four-quadrant photodetector) converging mirror group (112) and a 4QPDa (113). On the left side of the beam splitter A (108), there is an RX mirror group A (109) on the optical fiber B (110). On the left side of the dichroic mirror A (104), there is an incoming optical fiber A (106). On the incoming optical fiber A (106), there is a TX mirror group A (105). On the right side of the fast-reflection mirror A (103), there is an optical antenna A (101) in the horizontal direction. On the other end of the fast-reflection mirror A (103), there is a computer A (102).

4. A full-duplex laser communication system based on dual-wavelength separation according to claim 1, characterized in that: On the left side of the high-reflection mirror B (211) of the terminal two (302), there is a high-reflection group B (212) and a 4QPDb (213). On the right side of the beam splitter B (208), there is an RX mirror group B (209) on the optical fiber B (210). On the right side of the dichroic mirror B (204), there is an incoming optical fiber B (206). On the incoming optical fiber B (206), there is a TX mirror group B (205). On the left side of the fast-reflection mirror B (203), there is an optical antenna B (201) in the horizontal direction. On the other end of the fast-reflection mirror B (203), there is a computer A (202).

5. A full-duplex laser communication system based on dual-wavelength separation according to claim 1, characterized in that: The bandpass filter (107) has a center wavelength of 1550nm.

6. A full-duplex laser communication system based on dual-wavelength separation according to claim 1, characterized in that: The dichroic mirror B (204) is coated with a 1550nm high reflectivity film and a 1310nm high transmittance film.

7. A full-duplex laser communication system based on dual-wavelength separation according to claim 1, characterized in that: The filter (207) is a bandpass filter with a center wavelength of 1310nm. The communication method for implementing the full-duplex laser communication system based on dual-wavelength separation as described in claim 1 includes the following steps: In terminal 1 (301), the 1310nm signal light is emitted through fiber A (106), and after being parallelized by the TX mirror group A (105), it is directed to the dichroic mirror A (104), reflected again by the fast reflector A (103), and enters the optical antenna A (101). The 1550nm signal light received by the optical antenna A (101) is reflected by the fast reflector A (103) and the dichroic mirror A (104), and then directed to the optical antenna A (101) through the bandpass filter (107) (center wavelength 1550nm). Beam splitter A (108) (7:3 = reflection: transmission), 70% of the light is reflected to RX mirror group A (109) and coupled into fiber B (110), 30% of the light is reflected by high reflection mirror A (111) and enters 4QPD (four-quadrant photodetector) converging mirror group (112), 4QPD (four-quadrant photodetector) converging mirror group (112) is focused onto 4QPDa (113), 4QPD (four-quadrant photodetector) converging mirror group (112) is used to determine the beam deflection, and computer A (102) controls the fast reflection mirror.

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