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

A technology of optical fiber preform and polarization-maintaining optical fiber, which is applied in the field of optical fiber, can solve the problems of low line birefringence and poor consistency, and achieve the effects of high line birefringence effect and good process repeatability

Inactive Publication Date: 2019-08-09
上海康阔光智能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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no. 1 example

[0041] In this embodiment, the optical fiber preform comprises a quartz sleeve 1, three core rods 2 (that is, germanium-doped quartz rods) and four pure silica rods 3, and the three core rods 2 are arranged in a row, that is, the core rods 2 The center line is in the same plane, and two pure quartz rods 3 are symmetrically distributed on both sides of the core rod 2, such as figure 2 As shown, the inner diameter of the quartz sleeve 1 is d 0 , the outer diameter d of mandrel 2 1 and the outer diameter d of the pure quartz rod 3 2 Both are d 0 / 3. The outer diameter of the outer diameter of the quartz sleeve 1 is D, and the relationship between the outer diameter and the inner diameter depends on the characteristics of the optical fiber to be processed. It is usually necessary to ensure that the final polarization-maintaining optical fiber is single-mode transmission on the fast axis and the slow axis. For an elliptical core fiber, the slow axis is the long axis of the core,...

no. 2 example

[0045] In order to further improve the birefringence of the elliptical-core polarization-maintaining optical fiber, the optical fiber preform of the present embodiment includes a quartz sleeve 1, five core rods 2 (i.e. germanium-doped quartz rods) and fourteen pure silica rods 3, Five mandrels 2 are arranged in a row, and seven pure quartz rods 3 are symmetrically distributed on both sides of the mandrel 2, such as Figure 4 As shown, the number of pure quartz rods 3 in the first row on both sides of the core rod 2 is four, and the number of pure quartz rods 3 in the second row on both sides of the core rod 2 is three, wherein the quartz casing 1 inner diameter d 0 , the outer diameter d of mandrel 2 1 and the outer diameter d of the pure quartz rod 3 2 Both are d 0 / 5. .

[0046] After the rods are melted and shrunk at high temperature, five core rods 2 are fused together to form an elliptical core (or elongated core), while fourteen pure silica rods 3 are fused together...

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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...

Claims

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Application Information

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IPC IPC(8): C03B37/012C03B37/027
CPCC03B37/01211C03B37/02709
Inventor 黄勇
Owner 上海康阔光智能技术有限公司
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