Double-groove surrounding type multi-core few-mode optical fiber based on space division-mode division multiplexing technology

Abstract

The invention provides a double-groove surrounding type multi-core few-mode optical fiber based on a space division-mode division multiplexing technology, and belongs to the field of communication optical fibers. The cross section of the optical fiber comprises 13 few-mode fiber cores; the few-mode fiber cores are sequentially provided with a few-mode core area, two quartz cladding layers and twogroove cladding layers from inside to outside at intervals; the number of transmission modes of a single few-mode fiber core is 5-8; one few-mode fiber core is placed in the center of the cross section of the optical fiber, the rest 12 few-mode fiber cores are distributed around the central few-mode fiber core in a double-ring arrangement central symmetry mode, and any three adjacent few-mode fiber cores are equidistant. According to the multi-core few-mode optical fiber, the performance of the optical fiber is adjusted and optimized by adjusting the fiber core diameter, the fiber core distance, the material refractive index difference and the groove depth and width, the size of the optical fiber is reduced as much as possible, and on the basis, inter-core / inter-mode crosstalk and differential mode group delay are controlled, so that the communication requirement is met, and the communication capacity is improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, in particular to a double-groove surround-type multi-core few-mode optical fiber based on space division-mode division multiplexing technology. Background technique [0002] Since Corning Corporation produced the first optical fiber in 1970, optical fiber communication technology has developed rapidly, and optical fiber communication has become the cornerstone of today's information society. With the increasing demand for information in society, today's optical fiber communication systems are developing towards ultra-high-speed, large-capacity, and long-distance. However, the gradual performance improvement achieved under the existing technology has approached the capacity limit of traditional single-mode physical channels. Since the 1990s, the transmission capacity of the global optical fiber communication network has followed the rapid increase of the society's demand for in...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the transmission capacity of the current communication optical fiber tends to the upper limit, and the transmission speed gradually cannot meet the actual needs, the present invention designs a technology based on space division-mode division multiplexing based on the space dimension used less in the multiplexing dimension of the optical fiber physical layer. The dual-groove surround multi-core few-mode fiber can be designed to adjust the diameter of the few-mode core region, the distance between adjacent cores, the width of the quartz cladding, and the width of the groove cladding, and control the refractive index difference of the material to ensure that each The number of few-mode fiber core transmission modes is 5-8. On this basis, the inter-core crosstalk, inter-mode crosstalk and differential mode group delay are controlled, and the fiber size is controlled as much as possible to expand the fiber communication capacity and meet the communication fiber standard.

This method can effectively solve the problem of reaching the upper limit of the capacity of traditional optical fibers, so as to realize a practical high-speed, large-capacity all-optical communication network

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