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An annular stress zone-birefringence polarization-maintaining optical fiber and its preparation method

A technology of polarization-maintaining fiber and stress zone, which is applied in the direction of polarization-maintaining fiber, cladding fiber, glass manufacturing equipment, etc., can solve the problems that the core is not in a perfect circle, the fiber loses circular symmetry, and cannot be used to prepare circular polarization-maintaining fiber. Achieve the effects of high production efficiency, strong anti-interference ability and low preparation cost

Active Publication Date: 2019-11-08
上海傲世控制科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of optical fiber loses circular symmetry due to etching, and the core is not perfectly circular, so it cannot be used to prepare circular polarization-maintaining optical fiber.

Method used

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  • An annular stress zone-birefringence polarization-maintaining optical fiber and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0031] A method for preparing an annular stress zone-birefringence polarization-maintaining optical fiber, specifically comprising the following steps:

[0032] (1) Depositing the outer cladding: control the deposition temperature to 1850°C and match the refractive index, and pass SiCl into the reaction tube of Φ30×2.5×500mm 4 (300mL / min), POCl 3 (30mL / m), CCl 2 f 2 (5mL / m) and O 2 (1800mL / min) reaction to generate SiO 2 ,P 2 o 5 and silicon fluoride;

[0033] (2) Deposition stress area: After the outer cladding is deposited, SiCl is introduced 4 (220mL / min), BBr 3 (400mL / min) and O 2 (1800mL / min), react at a temperature of 1800°C to form SiO 2 and B 2 o 3Deposited on the inner surface of the outer cladding obtained in step (1), forming an annular stress zone with a circular cross section;

[0034] (3) Deposit inner cladding: control the refractive index to be matched, and introduce SiCl 4 (300mL / min), POCl 3 (40mL / min), CCl 2 f 2 (5mL / min) and O 2 (1800mL / mi...

Embodiment 2

[0040] This embodiment is basically the same as Embodiment 1, the difference is that the GeCl of 5mL / min is also passed into step (2) simultaneously. 4 , the reaction product is SiO 2 , B 2 o 3 and GeO 2 A mixture of refractive index and outer cladding SiO 2 The refractive index is equal.

Embodiment 3

[0042] This embodiment is basically the same as Embodiment 1, the difference is that the MCVD process system used in this embodiment has special equipment for gas phase doping, and step (4) is to mix SiCl 4 (300mL / min), GeCl 4 (30mL / min) and O 2 (1800mL / min) at a temperature of 1850°C to generate SiO 2 and GeO 2 , deposited inside the inner cladding to form a core, and then shrunk into an optical fiber preform at a temperature of 1900°C.

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PUM

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Abstract

The invention relates to an annular stress region-birefringent polarization maintaining optical fiber which comprises a fiber core, an internal wrapping layer, a stress region and an external wrapping layer which are arranged front inside to outside. The cross section of the fiber core is circular. The internal wrapping layer wraps the periphery of the fiber core. The stress region is a refractive index matching type or refractive index non-matching type annular stress region of which the cross section is annular, and the stress region wraps the periphery of the internal wrapping layer. The external wrapping layer wraps the periphery of the annular stress region. Compared with the optical fibers in the prior art, the annular stress region-birefringent polarization maintaining optical fiber has the advantages of being high in anti-interference capacity, high in production efficiency and low in cost.

Description

technical field [0001] The invention relates to an annular birefringent optical fiber, in particular to an annular stress region-birefringent polarization-maintaining optical fiber and a preparation method thereof. Background technique [0002] The optical fiber current sensor is a high-grade detection instrument that uses Sagnac interferometry to detect the phase difference of light waves. It has the characteristics of high sensitivity and good stability. Higher than gold, due to the huge market temptation, many manufacturers outsource. [0003] Low birefringence optical fiber is replaced by circular polarization maintaining optical fiber to prepare optical fiber current sensor, but this optical fiber is not anti-interference, and the performance of current sensor is difficult to meet the standard. [0004] Chinese patent CN102295407A discloses a method for manufacturing a polarization-maintaining optical fiber. The polarization-maintaining optical fiber is an elliptical-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/024G02B6/036C03B37/018C03B37/022
CPCC03B37/018C03B37/022G02B6/024G02B6/03694
Inventor 申云华王毅强
Owner 上海傲世控制科技股份有限公司
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