Method for making bend-insensitive multimode optical fiber

Abstract

The invention discloses a bent and insensitive multimode optical fiber. A light guiding interface layer is arranged between a core rod and an outer wrapping layer, a conduit interface layer is formed by a fluoride-doped inner wrapping layer tube arranged on the core rod in a sleeved mode, and the outer wrapping layer wraps the fluoride-doped inner wrapping layer tube. The manufacturing method includes the first step of manufacturing the core rod, the second step of manufacturing the fluoride-doped inner wrapping layer tube, the third step of manufacturing the outer wrapping layer, enabling a silica dioxide porous body to be deposited outside a fluoride-doped transparent silicon dioxide glass tube, and obtaining the outer wrapping layer wrapping a fluoride-doped inner wrapping layer, the fourth step of manufacturing an integral fiber rod, heating a pipe body which is subjected to the third step, inserting the core rod which is manufactured in the first step into the pipe body, and sintering the core rod and the pipe body into a whole to form the integral fiber rod, and the fifth step of carrying out optical fiber drawing. Through the method, the conductivity of an original high-order guided mode in an optical fiber core is enhanced greatly and the bending resistance of the optical fiber is improved effectively; the manufacturing method can be used for accurately controlling the refractive index distribution of the optical fiber, eliminating center sag and improving the properties of the optical fiber.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to a bend-insensitive multimode optical fiber and a manufacturing method thereof. Background technique [0002] With the rapid development of FTTx, a large number of multimode optical fibers have entered the room. In indoor and narrow environments, the optical fiber is subject to high bending stress. In the storage box, the optical fiber will be subjected to a large bending stress. At the same time, higher requirements are put forward for the attenuation and mechanical bending resistance of optical cables. In order to solve these problems, bend-insensitive multimode fiber came into being. Indoor cables using bend-insensitive multimode fiber can simplify installation to some extent, thereby reducing installation costs and reducing the risk of system interruption or failure. Due to the many advantages of bend-insensitive multimode fiber, it was favored by the market once it was launche...

AI Technical Summary

Problems solved by technology

2. The center of the optical fiber is depressed

This central depression will affect the transmission characteristics of the fiber and reduce the performance of the fiber

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