Single-mode coupling optical fiber with low macrobending loss

Abstract

The invention discloses a single-mode coupling optical fiber with a low macrobend loss, comprising an inner core layer, an outer core layer, an inner cladding layer, a transition cladding layer, and an outer cladding layer from the inside to the outside. The outer core layer has a refractive index profile that is stepped from a refractive index of an inner core fiber to the refractive index of aninner cladding fiber. The transition cladding layer has the refractive index profile that is stepped from the inner cladding layer to the outer cladding layer. The refractive index of the core layer of the optical fiber of the invention is a stepped structure, so that a fiber material from the core layer to the cladding layer is linearly reduced by doping high concentration cerium, and the dopingin the core layer changes linearly rather than abruptly. The diameters of the inner cladding layer and the outer cladding layer are introduced into the transition cladding layer, so that an optical fiber material smoothly transitions from more fluorine doping to a pure quartz material, and the high parasitic loss caused by mutation of the material components in the heat treatment process is reduced.

Description

technical field [0001] The invention belongs to the technical field of optical fibers, and more particularly, relates to a single-mode coupling optical fiber with low macrobending loss. Background technique [0002] In the past 20 years, optical fiber communication has developed rapidly, the basic platform of modern communication network has been transformed into an optical network platform, and optical devices have been increasingly used in optical networks. Optical coupler is an important type of passive device in optical devices. It can redistribute the transmitted optical signal power in the coupling area with special structure. In the early stage, it was mostly used to monitor a certain power taken out from the transmission trunk. In recent years, with the development of optical fiber communication, optical fiber CATV, optical fiber to the home, optical fiber sensing technology, passive optical network and other fields, its application has become more and more widely, f...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a single-mode coupled optical fiber with low macrobending loss, the purpose of which is to increase the doping amount of germanium from the core layer to the cladding layer by adopting a trapezoidal transition to the refractive index of each layer section. The layer gradient decreases, and the fluorine doping amount increases gradually from the core layer to the cladding layer, thereby improving the heat-treated tapering performance of the optical fiber, and has anti-macrobending performance, thereby solving the problem that the existing optical fiber tapering loss is large and cannot meet the needs of optical devices. Technical issues in production requirements

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