Divergence angle changing device based on double-clad optical fiber

Abstract

The invention provides a variable divergence angle device based on a double-clad fiber, and the device comprises a switching module which comprises an input end focal plane and an output end focal plane at two ends, and can control a light beam convergence point to move on the output end focal plane; the input optical fiber comprises an input optical fiber input end and an input optical fiber output end, the input optical fiber input end is used for being connected with a light source, and the input optical fiber output end is placed on the input end focal plane; and the output optical fiber comprises an output optical fiber input end and an output optical fiber output end, the output optical fiber input end is placed on the output end focal plane, the output optical fiber output end leads to the free space, and the output optical fiber is a double-clad optical fiber. According to the variable divergence angle device, the position of the light beam on the end face of the optical fiber can be controlled through the switching module when the light beam is coupled into the output optical fiber, so that the light beam is controlled to be transmitted in the fiber core or the inner cladding of the output light, and variable divergence angle output of the light beam is achieved.

Description

technical field [0001] The invention relates to the field of laser communication, in particular to a variable divergence angle device based on a double-clad optical fiber. Background technique [0002] Free Space Optical Communication (FSO) is a type of optical communication. Different from optical waveguide communication, free space optical communication can get rid of the limitation of optical fiber and can be applied in more comprehensive scenarios, such as direct communication between satellite and ground or satellite and satellite; based on the excellent directionality of laser, it can greatly improve the confidentiality of communication; At the same time, long-distance laying of optical fiber lines can be avoided, saving huge manpower and material costs. [0003] The first problem to be solved in free space optical communication is how to quickly capture the opponent's terminal and stably track and aim during long-distance narrow-beam communication—especially satellit...

AI Technical Summary

Problems solved by technology

However, if the divergence angle is too small, it will bring great trouble to the capture. The general solution is to add a beacon light system coaxial with the signal light and with a large divergence angle to the signal light system.

The beacon light system not only brings additional difficulties and risks to system integration, but also increases terminal volume and quality

Traditional beacon light solutions cannot meet the increasing lightweight requirements of satellite payloads

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