Multi-core fiber demultiplexer and manufacturing method thereof

Abstract

The invention belongs to the technical field of fibers, and provides a multi-core fiber demultiplexer and a manufacturing method thereof. The multi-core fiber demultiplexer includes at least two multi-mode fibers formed by tapering fusion. The non-fused end of each multi-mode fiber is welded to a single-mode fiber through tapering. Single-mode outputs are achieved, the insertion loss is low, and the multi-core fiber demultiplexer is simple in manufacturing method, functions reliably and is low in cost. When the multi-core fiber demultiplexer is a dual-core fiber demultiplexer, the light energy of two parallel fiber cores in a dual-core fiber is output with low loss and also in an optical coupling manner, thus greatly widening applications of the dual-core fiber in the field of sensing and communication. Meanwhile, two large semicircular fiber cores approaching to each other in distance are arranged on the transverse plane of the dual-core fiber demultiplexer, so the dual-core fiber demultiplexer is suitable for both a coupling type dual-core fiber with a small core distance and a non-coupling type dual-core fiber with a big core distance.

Description

technical field [0001] The invention belongs to the field of optical fiber technology, in particular to a multi-core optical fiber splitter and a manufacturing method thereof. Background technique [0002] Multi-core optical fiber is a special optical fiber with special refractive index distribution. It breaks through the refractive index distribution structure of conventional optical fibers, and arranges more than two parallel cores in the cladding of the same optical fiber. Dual-core optical fiber is a kind of multi-core optical fiber, which is divided into two types: coupled dual-core optical fiber and uncoupled dual-core optical fiber. The distance between the two cores of the coupled dual-core fiber is relatively close, and the optical energy is coupled between the two cores in the form of evanescent waves, while the distance between the two cores of the uncoupled dual-core fiber is relatively long, and the optical energy is between the two cores. There is usually no m...

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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a multi-core optical fiber splitter, which aims to solve the problem of simultaneously outputting the light in the optical fiber due to the very small distance between the cores and the very small size of the existing multi-core optical fiber. And it cannot be interconnected with low loss through various optical devices, and the application is limited

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