Double-groove wrap-around multi-core few-mode fiber based on space division-mode division multiplexing technology

Abstract

The present invention designs a double-groove surround-type multi-core few-mode optical fiber based on space division-mode division multiplexing technology, which belongs to the field of communication optical fibers, and includes 13 few-mode fiber cores in the cross-section of the optical fiber; the few-mode fiber The core is distributed in turn from the inside to the outside with few-mode core regions, two quartz claddings and two trench claddings; the number of transmission modes of a single few-mode core is 5-8; one of the few-mode cores is placed on At the very center of the fiber cross-section, the other 12 few-mode cores are distributed around the central few-mode core in a double-ring arrangement and centrally symmetrical, and any three adjacent few-mode cores are equidistant. The multi-core few-mode fiber of the present application adjusts and optimizes the performance of the fiber by adjusting the core diameter, the distance between the cores, the refractive index difference of the control material, the depth and the width of the groove, and reduces the size of the fiber as much as possible. On this basis, the inter-core / Inter-mode crosstalk and differential mode group delay to meet communication requirements and improve communication capacity.

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 been rising rapidly following the social demand for inform...

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

Images