Single-mode fiber automatic coupling system of all-fiber laser radar

Abstract

The invention relates to a laser radar receiving system, and particularly relates to a single-mode fiber automatic system of an all-fiber laser radar. The single-mode fiber automatic system is characterized by comprising a first convex lens, a second convex lens, a self-focusing lens mounted in an XY two-dimensional adjusting frame, and a single-mode fiber which are arranged in sequence, wherein one end of the single-mode fiber is connected with the self-focusing lens, and the other end of the single-mode fiber is connected with a micro-lens of an image acquisition module; the image acquisition module is connected with an upper computer through an image processing module, a main control module and a communication module in sequence; and the output end of the main control module is respectively connected with an X-axis execution mechanism and a Y-axis execution mechanism of the two-dimensional adjusting frame through a drive module so as to adjust the position of the self-focusing lens. The single-mode fiber automatic system provided by the invention has the advantages of compact structure of a beam splitting system, simplicity, practicability, stable performance and lower cost, thus providing a new solution scheme for improving the coupling efficiency of the all-fiber laser radar.

Description

technical field [0001] The invention relates to a laser radar receiving system, in particular to an all-fiber laser radar single-mode optical fiber automatic coupling system. Background technique [0002] In the general receiving system of the atmospheric remote sensing lidar system, the echo signal received by the multimode fiber-optic coupling telescope is mostly used, and the coupling efficiency is relatively high. However, in the all-fiber laser radar system, since the optical splitting device usually uses fiber Bragg grating and other devices to form the optical splitting system, in order to be able to connect normally with the fiber Bragg grating, a single-mode fiber must be used to couple the echo signal received by the telescope. . However, since the core diameter and numerical aperture of single-mode fiber are much smaller than those of multi-mode fiber, the coupling efficiency between it and the telescope is much lower than that of multi-mode fiber. Therefore, in ...

AI Technical Summary

Problems solved by technology

In addition, in the coupling of semiconductor lasers and optical fibers, optical fiber connections, directional coupling, coherent lidar and optical fiber sensors, there is also the problem of low coupling efficiency of single-mode optical fibers

Images