Multi-cladding optical fibre and multi-core optical fibre coupler

Abstract

The invention discloses a multi-cladding optical fibre and a multi-core optical fibre coupler. The multi-core optical fibre coupler comprises N multi-cladding optical fibres and a bushing; the multi-cladding optical fibre comprises a fibre core and multiple claddings encircling the fibre core; the multiple claddings sequentially comprise an inner cladding, a sunken inner cladding, an annular cladding, an outer cladding, a sunken outer cladding and a mechanical cladding from inside to outside; the multi-core optical fibre coupler is obtained by inserting the N multi-cladding optical fibres intothe bushing, tapering and cutting the bushing at one point in the middle of the bushing and welding a multi-core optical fibre; after the N multi-cladding optical fibres are inserted into the bushingand tapered, the fibre core, the inner cladding, the sunken inner cladding and the annular cladding of each multi-cladding optical fibre of the tapered end form a tapered fibre core; and the outer cladding, the sunken outer cladding and the mechanical cladding form a tapered cladding. According to the multi-core optical fibre coupler provided by the invention, after being tapered, the multi-cladding optical fibre can be in low-loss welding with the multi-core optical fibre, and also can be in low-loss welding with a standard single-mode optical fibre; and furthermore, the macrobend loss is relatively low.

Description

technical field [0001] The present invention relates to the field of optical fiber technology, and more specifically, to a multi-clad optical fiber and a multi-core optical fiber coupler. Background technique [0002] In order to meet the needs of future communication systems, multi-core optical fiber has been paid more and more attention because it can provide a new multiplexing dimension of space, which can greatly increase the capacity of communication systems. The multi-core optical fiber communication system needs to be compatible with the existing single-mode optical fiber communication system, which requires multi-core optical fiber and single-mode optical fiber to achieve low-loss connection. The multi-core optical fiber coupler can act as a bridge between single-mode optical fiber and multi-core optical fiber Therefore, the multi-core optical fiber coupler and the optical fiber for preparing the multi-core optical fiber coupler are extremely important, and it has be...

AI Technical Summary

Problems solved by technology

[0007] In view of the defects of the prior art, the purpose of the present invention is to solve the technical problems that the existing multi-core optical fiber coupler is affected by the optical fiber used in the preparation process, so that the processing accuracy, processing difficulty, cost and loss are insufficient.

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