Multi-core few-mode microstructure optical fiber for field of space division-mode division multiplexing

Abstract

A multi-core few-mode microstructure optical fiber for the field of space division-mode division multiplexing comprises a central area and an outer cladding area, and the outer cladding area is arranged on the periphery of the central area. The central area comprises few-mode fiber cores and an air hole inner cladding, and a plurality of few-mode fiber cores are arranged in the central area. The number of degenerate transmission modes of a single few-mode fiber core is greater than or equal to 2. One few-mode fiber core is arranged in the center of the central area, the other few-mode fiber cores are uniformly distributed around the few-mode fiber core in the center, any three adjacent few-mode fiber cores are equidistant, and an air hole inner cladding is arranged between the periphery ofeach few-mode fiber core and the two adjacent few-mode fiber cores. According to the optical fiber, the number of degenerate transmission modes of each fiber core can be ensured to be more than two by designing and adjusting the diameters of the air holes and the distances between the holes and controlling the refractive index difference of materials, the size of the optical fiber is reduced as much as possible, inter-core / inter-mode crosstalk and differential mode group delay are controlled on the basis to meet the communication requirement, and the communication capacity is improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to a multi-core few-mode microstructure optical fiber used in the field of space division-mode division multiplexing. Background technique [0002] As one of the most important information transmission methods, optical fiber communication has laid the foundation stone for today's information society. After nearly half a century of development, the single-mode optical fiber communication system has gradually reached the Shannon limit of its transmission capacity. However, the demand for future communication capacity will continue to grow at a rate of 100 times every ten years, and fiber optic communication technology is facing severe challenges. There are five physical dimensions of optical signals that can be modulated or multiplexed, namely time, frequency (wavelength), polarization state, complex amplitude and space. Compared with other dimensions,...

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Problems solved by technology

[0003] Among the five dimensions in which optical signals can be modulated or multiplexed, time and frequency (wavelength) multiplexing have been used in the early stages of optical fiber communication development. At present, there is not much potential to be tapped. Relying on polarization multiplexing can only improve one level. For the complex amplitude dimension, limited by the signal-to-noise ratio of the optical fiber communication system, the modulation order cannot be increased without limit, resulting in a limited maximum frequency efficiency. Only space is a dimension that has not yet been fully developed and utilized, and can enable Under the framework, the capacity of optical fiber communication has been rapidly increased by 2-3 orders of magnitude to solve the foreseeable capacity shrinkage problem in the future. As the bottleneck of traditional single-mode optical fiber transmission capacity becomes increasingly prominent, space division / mode division multiplexing technology has gradually received attention and has become the current Eye-catching cutting-edge research directions and hot topics in the field of optical fiber communication

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