Mode weak-coupling dual annular fiber core structure fiber

Abstract

The present invention discloses a mode weak-coupling dual annular fiber core structure fiber. The fiber structure comprises a center fiber core, an inner annular fiber core, an outer annular fiber core and a cladding in order from inside to outside. The relative index differences of refraction between the refractive indexes of the center fiber core, the inner annular fiber core and the outer annular fiber core and the refractive index of the cladding do not exceed 1.2%, and the relative index difference between the refractive index of the outer annular fiber core and the refractive index of the inner annular fiber core does not exceed 0.7%. The problems are solved that independent modes are few in number, large in mode crosstalk and large in transmission loss in the current fibers, and themode weak-coupling dual annular fiber core structure fiber considers the preparation technology of a current commercial-use common single mode fiber and has great performance and cost advantages compared to the current fibers on the market.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a mode weakly coupled double annular core structure optical fiber. Background technique [0002] With the continuous increase of network users and the continuous emergence of new network data services, the demand for network capacity continues to grow. Since common optical multiplexing dimensions (time, wavelength, polarization, and multi-level modulation) have already faced the bottleneck of potential development, the current optical communication system based on ordinary single-mode fiber has been unable to cope with the booming network capacity demand. As a new type of optical multiplexing dimension, space division multiplexing has great potential to solve the capacity of future optical communication systems, and has received extensive attention worldwide. Spatial division multiplexing technology can be divided into mode division multiplexing technology that utilizes mult...

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Problems solved by technology

[0016] Aiming at the problems existing in the existing technology, the purpose of the present invention is to provide a mode weakly coupled double ring core structure optical fiber, which can solve the problems of the existing technology such as the small number of independent modes, large mode crosstalk, and large transmission loss, and is compatible with current commercial applications. The preparation technology of ordinary single-mode optical fiber has great performance and cost advantages compared with existing optical fibers in the market

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