Efficient space light-optical fiber coupling method

Abstract

An Efficient space light-optical fiber coupling method is realized through the following steps: an optical antenna receives space lights, and then the space lights are converged to be transmitted into a liquid crystal phase controller; the phase of the converged lights is controlled by the liquid crystal phase controller; and the space lights are coupled into a single mode optical fiber. The light signals coupled into the single mode optical fiber are divided into two parts by a power divider, and are transmitted to a communication receiver and a photoelectric detector respectively. The photoelectric detector detects the intensity of the coupled light signals in real time and transforms the received light signals into electric signals and transmits the electric signals into a PID control circuit of the liquid crystal phase controller. The PID control circuit dynamically controls the control voltage of the liquid crystal phase controller as per the intensity of the detected light signals, so as to dynamically control the phase of the converged lights and realize efficient dynamic coupling.

Description

technical field [0001] The invention relates to a high-efficiency space light-fiber dynamic coupling method, which belongs to the technical fields of satellite laser communication and laser radar. Background technique [0002] In the satellite optical communication system, in order to make full use of the mature optical fiber communication technology, an important problem needs to be solved: to couple the spatial optical signal received by the optical antenna into the single-mode optical fiber, and then perform signal processing (amplification) on the received optical signal, Send it into photodetector or switching matrix to realize photoelectric detection and optical switching of received optical signal. In order to ensure that the receiving optical power is high enough, the aperture of the receiving optical antenna is usually larger than 100mm, and it is very technically difficult to couple the spatial light received by the optical antenna into the single-mode fiber. [0...

AI Technical Summary

Problems solved by technology

Solved the problem of low coupling efficiency and instability of space light-single-mode fiber coupling in satellite optical communication systems

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