A preparation method of multi-core optical fiber coupler based on reverse tapered technology

Abstract

The invention belongs to the technical field of optical fiber communication, and particularly relates to a multi-core optical fiber coupler preparation method based on reverse tapering technology. Themethod comprises the following steps: stripping a coating layer of a multi-core optical fiber, reversely tapering the multi-core optical fiber, and finishing cutting at the position with the maximumcladding diameter; preprocessing the plurality of single-core optical fibers, and preparing a single-core optical fiber bundle according to a fiber core arrangement mode of the multi-core optical fibers; stacking and fixing the single-core optical fiber bundle in a glass capillary tube, and performing fused biconical taper to enable each fiber core mode field, each fiber core position and the diameter of the capillary tube to be matched with each fiber core mode field, each fiber core position and the cladding diameter after reverse biconical taper of the multi-core optical fiber bundle; and cutting the waist of the tapering single-core optical fiber bundle, and aligning with one end of the maximum cladding diameter of the multi-core optical fiber to finish welding. According to the method, the alignment precision requirement can be reduced, and the optical coupling efficiency between multiple single-core optical fibers and each core of the multi-core optical fiber can be effectively improved; inter-core crosstalk during coupling is effectively suppressed, and meanwhile, the welding strength is improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to a preparation method of a multi-core optical fiber coupler. Background technique [0002] With the continuous expansion of communication system capacity in recent years, the transmission capacity of single-core optical fiber is approaching its physical limit. Because it can greatly increase system capacity, multi-core optical fibers that can provide space division multiplexing have received great attention. However, a low-loss, low-crosstalk high-quality coupling method is particularly important in order to connect multi-core optical fibers to existing communication systems and achieve wider applications. [0003] The existing multi-core fiber couplers mainly have the following preparation methods: [0004] One is to use the lens method and the polymer waveguide method. These methods all involve the introduction of other non-fiber devices, which ...

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Problems solved by technology

[0007] In all the above preparation methods, the splice loss obtained is related to the alignment degree of the fibers on both sides before splicing. If there is a slight misalignment in the lateral direction, a higher coupling or splicing loss will be obtained in the end.

At the same time, the position error of each core in the multi-core fiber will also increase the coupling or splicing loss of the single-core channel, resulting in poor consistency of the loss of each channel

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