Combined core adjustment method capable of improving tail fiber coupling of semiconductor laser

Abstract

The invention discloses a combined core adjustment method capable of improving tail fiber coupling of a semiconductor laser, which comprises the following steps of: fixing a lens and a tail fiber by a fixture, wherein the distance between the lens and the tail fiber is the designed optimal coupling distance; performing three-dimensional adjustment on the lens and the tail fiber which are connected to be a whole, detecting the optical power generated by tail fiber coupling at the same time, and fixing and assembling the lens when the optical power detected is maximum; and removing the fixture, adjusting and fixing by adopting a dynamic core adjusting method, and assembling the tail fiber. The lens and tail fiber adjustment adopts the dynamic core adjustment method which makes the coupling power monitored directly, so the optimal coupling efficiency is guaranteed; and compared with the prior art, the coupling efficiency is greatly improved and can be up to 60 percent when the non-spherical single lens is used for coupling.

Description

Technical field: [0001] The invention relates to a core adjustment method for semiconductor laser tail fiber coupling, in particular to a combined core adjustment method which is simple to operate and can improve the semiconductor laser tail fiber coupling efficiency. Background technique: [0002] Since the mode field radius of the semiconductor laser (LD) spot is much smaller than that of the optical fiber, in order to effectively couple the light emitted by the LD into the pigtail, it is necessary to fix a laser between the semiconductor laser (LD) and the pigtail. A lens, through which the mode field radius of the LD spot is amplified to a linear dimension similar to that of the pigtail mode field radius. The distance on the axis from the center of the LD emission to the center of the lens and the distance on the axis from the center of the lens to the center of the end face of the pigtail determine the coupling power of the semiconductor laser pigtail. The optimal coupl...

AI Technical Summary

Problems solved by technology

However, it is generally difficult to judge whether the distance from the center of the LD to the center of the lens on the axis is just equal to the optimal coupling distance designed by the existing centering method, so that the assembled lens often deviates from the optimal position, resulting in the attainable The optical coupling efficiency is very low, especially when the fiber head is ground into an 8-degree angle to prevent reflection, its optical coupling efficiency generally does not exceed 20%