CN-120567299-B - Quick link establishment laser communication method and system based on optical phased array

CN120567299BCN 120567299 BCN120567299 BCN 120567299BCN-120567299-B

Abstract

The invention relates to the technical field of wireless laser communication, and particularly discloses a rapid link establishment laser communication method and system based on an optical phased array. The quick link-building laser communication system based on the optical phased array comprises an active transmitting terminal and a cat eye reverse modulation laser communication terminal, wherein the active transmitting terminal is used for transmitting uplink optical signals and comprises a control processing unit, a laser driver, a laser, a collimation beam expander and a spatial light modulator which are sequentially arranged, and the cat eye reverse modulation laser communication terminal is used for receiving the uplink optical signals and feeding back downlink optical signals and comprises a cat eye optical system, a spectroscope, a spatial light modulator, a second photoelectric detector and a control processing unit. The problem of the current wireless laser communication system link establishment difficulty is solved.

Inventors

Zhang laixian
Zhan Chenlong
LI YINGCHUN
GUO HUICHAO
ZHENG HAIJING
Luan Chenglong
LI RONG
LI LONGJIE
ZHU RUI
LIANG AN

Assignees

中国人民解放军军事航天部队航天工程大学

Dates

Publication Date: 20260505
Application Date: 20250529

Claims (2)

1. The rapid link construction laser communication system based on the optical phased array is characterized by comprising an active emission terminal (1) and a cat eye reverse modulation laser communication terminal (2); The active transmitting terminal (1) is used for transmitting uplink optical signals and comprises a control processing unit (1-0), a laser driver (1-1), a laser (1-2), a collimation beam expander (1-4) and a spatial light modulator (1-6) which are sequentially arranged; The cat eye reverse modulation laser communication terminal (2) is used for receiving an uplink optical signal and feeding back a downlink optical signal and comprises a cat eye optical system (2-1), a spectroscope (2-2), a spatial light modulator (2-3), a second photoelectric detector (2-4) and a control processing unit (2-6); the active transmitting terminal (1) is also used for receiving downlink optical signals and further comprises a large-view-field receiving lens (1-10), a first photoelectric detector (1-11) and a signal acquisition unit (15) which are sequentially arranged along the downlink optical signal direction; the active transmitting terminal (1) further comprises a phase controller (1-7) for performing phase shift control on the spatial light modulator (1-6), and receiving and transmitting phase shift signals (1-8) according to the control processing unit (1-0) and the electric signals of the spatial light modulator (1-6); The method for completing link establishment by using the rapid link establishment laser communication system based on the optical phased array comprises the following steps: A control processing unit (1-0) in an active transmitting terminal (1) generates TTL coding communication pulse signals according to a contracted capture tracking aiming protocol based on the priori knowledge of the azimuth of a large-view-field cat eye reverse modulation laser communication terminal (2), the TTL coding communication pulse signals are input into a laser driver (1-1) to control the laser (1-2) to emit uplink communication laser (1-3), the communication laser (1-3) becomes uplink plane waves (1-5) through a collimation beam expander (1-4), the uplink plane waves are irradiated to a spatial light modulator (1-6), a specific phase shift signal (1-8) is generated through a phase controller (1-7) according to the capture tracking aiming strategy, and the spatial light modulator (1-6) is controlled to regulate the phases of each point in space of the uplink plane waves (1-5) to form uplink communication beams (1-9); The uplink communication light beam (1-9) scans an uncertain area, and when the uplink communication light beam scans the cat eye reverse modulation laser communication terminal (2), the cat eye optical system (2-1) is used for splitting the uplink communication light beam (1-9) through the spectroscope (2-2) and focusing the uplink communication light beam on the spatial light modulator (2-3) and the second photoelectric detector (2-4) respectively; The second photoelectric detector (2-4) forms a detection signal (2-5), and a downlink modulation signal (2-7) is generated according to the control of a contracted capture tracking aiming protocol after the detection signal is processed and analyzed by the control processing unit (2-6); The control spatial light modulator (2-3) forms a reverse modulation reflection light signal (2-8), and the reverse modulation reflection light signal is reflected to a large-view-field receiving lens (1-10) in the active transmitting terminal (1) in an original way through the cat eye optical system (2-1), is focused on the first photoelectric detector (1-11) to perform photoelectric conversion, and is sent to the control processing unit (1-0) to perform processing, so that link establishment is completed; The scanning range of the uplink communication light beam (1-9) generated by the active transmitting terminal (1) can cover an uncertain area where the cat eye-based reverse modulation laser communication terminal (2) is located and a receiving view field of the large-view-field receiving lens (1-10); The active emission terminal (1) is located in an effective field angle range of the basic large-field cat eye reverse modulation laser communication terminal (2).
2. The fast link-building laser communication system based on optical phased array according to claim 1, characterized in that the lasers (1-2) are narrow linewidth lasers.

Description

Quick link establishment laser communication method and system based on optical phased array Technical Field The invention relates to the technical field of wireless laser communication, in particular to a rapid link establishment laser communication method and system based on an optical phased array. Background With the development of information technology, the demand for high-speed and safe data transmission is increasingly urgent, and the traditional microwave link has the limitations of limited bandwidth, easy interference and the like and cannot meet the demand for information transmission under the condition of strong electromagnetic interference. The wireless laser communication adopts laser as a communication carrier wave, has the advantages of high safety, strong electromagnetic interference resistance and the like, and is one of important development directions of safe communication under the condition of strong electromagnetic interference. The existing typical wireless laser communication system is limited by beam divergence angle, two communication terminals are required to establish a communication link through complex aiming, capturing and tracking processes, the link establishment efficiency is low, and the applicability of wireless laser communication is severely limited. The design of a laser communication system capable of quickly establishing a link is an effective means for solving the problem of high-capacity high-speed safe data transmission under the condition of strong electromagnetic interference. Disclosure of Invention In order to solve the problem of difficult link establishment of the existing wireless laser communication system, the first object of the invention is to provide a rapid link establishment laser communication system based on an optical phased array, wherein an active emission terminal based on the optical phased array and a large-view-field cat eye reverse modulation laser communication terminal based on the cat eye effect are respectively used as active and passive information nodes, the capturing tracking alignment process of the active end is improved through the optical phased array technology, the capturing tracking alignment process of the passive information node is omitted through the reverse modulation technology, the link establishment time can be greatly reduced, and the rapid link establishment is realized. The second object of the invention is to provide a rapid link establishment laser communication method based on an optical phased array. In order to achieve the first purpose, the first technical scheme of the invention is that the rapid link-building laser communication system based on the optical phased array comprises an active emission terminal and a cat eye reverse modulation laser communication terminal; The active transmitting terminal is used for transmitting uplink optical signals and comprises a control processing unit, a laser driver, a laser, a collimation beam expander and a spatial light modulator which are sequentially arranged; The cat eye reverse modulation laser communication terminal is used for receiving an uplink optical signal and feeding back a downlink optical signal and comprises a cat eye optical system, a spectroscope, a spatial light modulator, a second photoelectric detector and a control processing unit. Preferably, the active transmitting terminal is further used for receiving downlink optical signals, and further comprises a large-view-field receiving lens, a first photoelectric detector and a signal acquisition unit, wherein the large-view-field receiving lens, the first photoelectric detector and the signal acquisition unit are sequentially arranged along the direction of the downlink optical signals. Preferably, the active transmitting terminal further includes a phase controller, configured to perform phase shift control on the spatial light modulator, and perform receiving and transmitting of phase shift signals according to the control processing unit and the electrical signal of the spatial light modulator. Preferably, the spatial light modulator regulates and controls the phases of each point in the uplink plane wave space, so that an uplink communication beam is formed and transmitted to the cat eye optical system. Preferably, in the cat eye reverse modulation laser communication terminal, the uplink communication beam passes through the cat eye optical system, and is split by a spectroscope to form two uplink optical signals, which are respectively focused on the spatial light modulator and the second photoelectric detector. Preferably, the second photodetector forms a detection signal, generates a downlink modulation signal through a control processing system, and controls the spatial light modulator to form a reverse modulation reflection optical signal. Preferably, the scanning range of the uplink communication beam generated by the active transmitting terminal can cover an uncertain area where the cat e