Inter-satellite laser communication system

Abstract

An inter-satellite laser communication system can be applied to free space laser communication. The principle of the system device is that in an emission light path, after passing through a 45-degreereflecting mirror, intensity modulated laser is emitted out through a receiving and transmitting shared light path. In the receiving optical path, the received signal light firstly passes through thereceiving and transmitting common optical path and then enters the photoelectric detection unit after passing through the optical filter, so that the position calculation and the extraction of communication signals are realized. The receiving and transmitting shared optical path is composed of a front optical wedge, a rear optical wedge, a receiving and transmitting lens and a central hole reflector. The establishment of a laser communication link is realized through the cooperative rotation of the front optical wedge and the rear optical wedge. The receiving and transmitting lens is used forfocusing the received parallel light and collimating and outputting the emitted light. And the mesoporous reflector is mainly used for realizing the separation of light receiving and emitting paths. The system has the characteristics that the design scheme of coaxial receiving and transmitting is adopted, the size is reduced, and meanwhile the stability of the system is improved. And the isolationdegree of the system is increased by using a mode that the emission wavelength is different from the receiving wavelength. And the deviation angle of the light beam reaches +-30 degrees in a mode ofrotating double optical wedges.

Description

technical field [0001] The invention belongs to the application field of inter-satellite laser communication networking, and is especially suitable for miniaturized, compact and lightweight high-speed, two-way data transmission between micro-satellites with severe resource constraints, specifically an inter-satellite laser communication system . Background technique [0002] Traditional radio frequency communication is limited by its frequency band, making it difficult for its communication rate to exceed 1Gbps. Space laser communication technology has become one of the most effective means to solve the bottleneck of radio frequency communication rate. At present, the high-speed inter-satellite laser communication link generally adopts the coherent laser communication system, which has high communication sensitivity and high communication rate, but the technology is complex and the resource consumption is large. Compared with the coherent communication system, the scheme b...

AI Technical Summary

Problems solved by technology

At present, the high-speed inter-satellite laser communication link generally adopts the coherent laser communication system, which has high communication sensitivity and high communication rate, but the technology is complicated and the resource consumption is large

Compared with the coherent communication system, the scheme based on intensity modulation-direct detection, although its communication sensitivity is low and the communication rate is low

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