Spatial light to single-mode fiber coupling system based on laser nutation

Abstract

Provided is an automatic spatial light to single-mode fiber coupling system based on laser nutation. The system comprises a 1.5 micron laser, an emission collimating mirror, a vibration fast reflector, a compensation fast reflector, a nutation fast reflector, a reception collimating mirror, a 1.5 micron single-mode fiber splitter, a linear detector, a ground reception system, a data collection unit, a digital signal processing unit and a real time storage and display unit. The system is simple in structure, the tracking algorithm is simple, and spatial light can be coupled to the single-mode fiber in high efficiency. The 2D nutation fast reflector is used to complete nutation scanning of laser at the end surface of the single-mode fibers, the nutation fast reflector is used to track the laser nutation position in the real-time tracking algorithm, tracking errors can be obtained by observing change of optical power output by the single-mode fibers, and high-speed tracking can be realized.

Description

technical field [0001] The invention is mainly used in laser communication, especially for the ground receiving system part in laser communication. Background technique [0002] In inter-satellite laser communication, since the end face of the single-mode fiber is very small and is easily affected by factors such as satellite platform vibration, atmospheric turbulence, and thermal effects, the problem of high-efficiency coupling of space light to the single-mode fiber becomes a solution to the ground receiving fiber. The key problem of DPSK system. With the development of domestic laser communication, some people in China have researched some coupling schemes, namely the coupling scheme based on the five-point tracking method and the coupling scheme based on the fine tracking method. The first scheme above is at the expense of tracking bandwidth, and the second scheme Spot imaging devices may be affected by platform vibrations and introduce new errors. The advantage of the...

AI Technical Summary

Problems solved by technology

With the development of domestic laser communication, some people in China have researched some coupling schemes, namely the coupling scheme based on the five-point tracking method and the coupling scheme based on the fine tracking method. The first scheme above is at the expense of tracking bandwidth, and the second scheme Spot imaging devices may be affected by platform vibration and introduce new errors

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