Optical fiber preform for manufacturing elliptical core polarization-maintaining optical fiber and manufacturing process of elliptical core polarization-maintaining optical fiber

Abstract

The invention discloses an optical fiber preform for manufacturing an elliptical core polarization-maintaining optical fiber. The optical fiber preform comprises a quartz sleeve, n core rods and N pure quartz rods; the center lines of all the core rods are located in the same plane, the pure quartz rods same in number are symmetrically distributed on both sides of each core rod, the relationship between the inner diameter d0 of the quartz sleeve, the outer diameter d1 of each core rod and the outer diameter d2 of each pure quartz rod satisfies the condition that d1=d2=d0 / n, and the relationship between the number N of the pure quartz rods, the number n of the core rods and the distribution column number C of the pure quartz rods on one side of each core rod satisfies the condition that n=2C+1, wherein n is an odd number greater than one. The invention also provides a manufacturing process of the elliptical core polarization-maintaining optical fiber. The optical fiber preform is meltedat the high temperature, the core rods are melted to form an elliptical core, the pure quartz rods are fused with the quartz sleeve to form an elliptical core optical fiber cladding layer, and wire drawing is carried out to prepare the birefringent elliptical core polarization-maintaining optical fiber. The fiber core of the optical fiber preform is formed in a high-temperature melting process within a short time, and the situation is avoided that thermal diffusion of the fiber core is caused by high-temperature melting of the preform for a long time and thus effective linear birefringence issignificantly reduced.

Description

technical field [0001] The present invention is related to optical fiber technology, and specifically belongs to a manufacturing process for optical fiber preforms and elliptical-core polarization-maintaining optical fibers used to manufacture elliptical-core polarization-maintaining optical fibers to solve the low and consistent birefringence of elliptical-core polarization-maintaining optical fibers made by traditional processes. problem of poor sex. Background technique [0002] There are many types of polarization maintaining fibers, typical ones are panda type polarization maintaining fiber, bow tie type polarization maintaining fiber, elliptical cladding type polarization maintaining fiber, elliptical core polarization maintaining fiber, photonic crystal polarization maintaining fiber and so on. At present, the polarization-maintaining fiber with the most widely used and most mature technology in China is the Panda-type polarization-maintaining fiber. The production p...

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide an optical fiber preform for manufacturing an elliptical-core polarization-maintaining optical fiber and a manufacturing process for an elliptical-core polarization-maintaining optical fiber, which can solve the problems caused by the length of the optical fiber preform in the production process of the existing elliptical-core polarization-maintaining optical fiber. Time in the high-temperature molten state causes the core to produce thermal diffusion effects, resulting in low line birefringence and poor consistency.

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