Multimode fiber beam splitter and production method thereof

Abstract

The invention provides a multimode fiber beam splitter and a production method thereof. The multimode fiber beam splitter comprises an input optical fiber and multiple output optical fibers, wherein the input optical fiber and the multiple output optical fibers are fixedly connected, the input optical fiber is a multimode fiber, and the output optical fibers are single-mode fibers. According to the multimode fiber beam splitter, the optical fiber at an input end is the multimode fiber, so that laser with higher power strength, larger M<2> factor and larger waist diameter is coupled into the optical fiber at the input end conveniently, and higher input-end laser coupling efficiency is realized; the optical fibers at an output end are single-mode fibers, so that output laser with small divergence angle, small waist diameter and uniform power distribution can be obtained. Further, in the production method of the multimode fiber beam splitter, a flow for removing part of an outer cladding layer is set for the single-mode fibers at the output end, the tapering difficulty of the late tapering process can be reduced, the stretched length of cores of the optical fibers at the output end is reduced, and taper is small, so that fiber core size and numerical aperture change are small, butt joint with the optical fiber at the input end is facilitated, and the coupling efficiency is increased.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a multimode optical fiber beam splitter and a manufacturing method thereof. Background technique [0002] Optical fiber, short for optical fiber, is a fiber made of glass or plastic that acts as a means of light transmission. An optical fiber usually includes a core, which is surrounded by a glass envelope with a lower refractive index than the core, commonly known as the cladding. Layer, used to protect the cladding. [0003] According to the propagation mode of light in the fiber, the fiber can be divided into multimode fiber and single mode fiber. Multimode fiber refers to an optical fiber that can transmit multiple modes of light waves, while single-mode fiber can only transmit signal waves of one mode. Single-mode and multi-mode are relative to specific wavelengths. The same optical fiber may be single-mode or multi-mode at different wavelengths. There is no distin...

AI Technical Summary

Problems solved by technology

At present, the tapered process technology of 1*2 fiber beam splitter is relatively mature, and the parameters such as splitting ratio and additional loss are easy to control. For 1*3 single-mode fiber beam splitter, although the process is better than that of 1*2 It is complicated, but it can still be made by this process; for 1*3 or more multimode fiber beam splitters, due to the thick core of the multimode fiber, it is difficult to couple the optical energy between the fibers, and the splitting ratio after fiber coupling It is also difficult to control the additional loss, and it is difficult to realize it by using the fiber fusion tapered coupling technology; and in the application of high optical power transmission, splitting uniformity and additional loss, and high beam quality after splitting, it is necessary to have a highly uniform splitting ratio and A multi-channel multi-mode fiber beam splitter with very small additional loss, and requires the output fiber to be a single-mode fiber to ensure the output of multiple laser beams with excellent beam quality

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