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A high-precision polarization-maintaining optical fiber and its preparation method

A polarization-maintaining optical fiber, high-precision technology, applied in the direction of polarized optical fiber, clad optical fiber, glass manufacturing equipment, etc., can solve the problems of low sensitivity or stability of sensor devices, low sensor accuracy, poor attenuation and extinction ratio performance, etc. , to optimize the birefringence effect and improve the accuracy

Active Publication Date: 2022-06-21
武汉库克光电技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a high-precision polarization-maintaining optical fiber and its preparation method, the purpose of which is to accurately control the stress distribution of the panda-type polarization-maintaining optical fiber in the directions of the fast axis and the slow axis, Therefore, the polarization maintaining fiber has good attenuation and excellent extinction ratio performance at wavelengths from 400 to 680nm, 850nm, 1310nm and 1550nm, so that the sensor device takes into account the sensitivity and stability of the polarization maintaining fiber, and improves its accuracy. Solve the technical problem of low sensitivity or stability of the sensor due to excessive attenuation or poor extinction ratio performance of the existing polarization-maintaining optical fiber, which ultimately leads to low sensor accuracy

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  • A high-precision polarization-maintaining optical fiber and its preparation method
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  • A high-precision polarization-maintaining optical fiber and its preparation method

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preparation example Construction

[0053] The preparation method of the high-precision polarization-maintaining optical fiber provided by the present invention includes the following steps: heating the optical fiber preform of the silica glass matrix to a viscoelastic state or even a molten state, and then drawing and cooling to form an optical fiber; wherein:

[0054] Drawing step: the drawing speed is above 100 m / min; during the drawing process, the tension along the fiber movement direction that the optical fiber bears in the viscoelastic state is 11 MPa to 75 MPa, preferably 15 MPa to 45 MPa, more preferably 20 MPa to 35 MPa.

[0055] Cooling step: the optical fiber is forcedly cooled from the drawing furnace to the take-up device, and the cooling rate is 1550°C / s to 5800°C / s, preferably 1550°C / s to 4000°C / s, more preferably 1550°C / s to 3000°C / s.

[0056] During the cooling process of wire drawing, the stress region and cladding of the fiber are transformed from viscoelastic state to solid state, and the r...

Embodiment 1

[0071] The first batch of cladding diameter d 0 The typical value of the polarization-maintaining fiber is 125 μm. The core rod is prepared by PCVD, MCVD, VAD, etc., and the stress area is made by PCVD, MCVD, chemical synthesis, etc. At a high temperature of 2300 °C, the optical fiber preform of the quartz glass matrix is ​​heated to a molten state, and the fiber is drawn and cooled to form an optical fiber; the drawing speed is above 100 m / min; the optical fiber is forced to cool by dry ice purging during the process from the drawing furnace to the take-up device. , the cooling rate is 1550°C / s to 4000°C / s. During the drawing process, the tension along the motion direction of the optical fiber in the viscoelastic state is 11MPa to 45MPa, and the drawing tension is equal to the ratio of the tension force on the bare fiber during the drawing process to the optical fiber cross-sectional area. During the cooling process, the stress region and cladding of the fiber are transforme...

Embodiment 2

[0075] The second batch of cladding diameter d 0 The typical value of the polarization-maintaining fiber is 80 μm. The core rod is prepared by PCVD, MCVD, VAD, etc., and the stress area is made by PCVD, MCVD, chemical synthesis, etc. At a high temperature of 2300 °C, the optical fiber preform of the quartz glass matrix is ​​heated to a molten state, and the fiber is formed by drawing and cooling; the drawing speed is above 100 m / min; the optical fiber is forced to cool by helium gas during the process from the drawing furnace to the take-up device. Cooling rate 1550°C / s to 3000°C / s. During the drawing process, the tension along the motion direction of the optical fiber in the viscoelastic state is 11MPa to 45MPa, and the drawing tension is equal to the ratio of the tension force on the bare fiber during the drawing process to the optical fiber cross-sectional area. During the cooling process, the stress region and cladding of the fiber are transformed from viscoelastic state ...

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Abstract

The invention discloses a high-precision polarization-maintaining optical fiber and a preparation method thereof. It is provided with a core layer and a quartz cladding layer in sequence from the inside to the outside. Stress zone; the line connecting the center of the stress zone of the fiber cross-section is the slow axis, and the diameter direction of the fiber cross-section perpendicular to the direction of the slow axis is the fast axis. At room temperature, there is compressive stress in the direction of the fast axis of the fiber core layer, and the maximum absolute value of the compressive stress in the direction of the fast axis of the fiber core layer is greater than 17MPa. The maximum absolute value of the tensile stress is greater than 12MPa. The preparation method comprises the following steps: heating the optical fiber preform rod of the quartz glass matrix to the viscoelastic state or even the melting state, drawing and cooling to form the optical fiber. The invention controls the tension and forced cooling rate in the drawing process, retains a part of the residual stress in the optical fiber in the drawing process, and reasonably adjusts the compressive and tensile stress values ​​in the fast axis and slow axis directions of the polarization maintaining optical fiber, thereby optimizing the birefringence effect, improving the accuracy of the polarization-maintaining fiber.

Description

technical field [0001] The invention belongs to the field of sensing optical fibers, and more particularly, relates to a high-precision polarization-maintaining optical fiber. Background technique [0002] In the field of sensing and control, it is necessary to measure and control physical quantities such as magnetic field, temperature, stress, inertia, etc., so a variety of optical fiber sensors have been developed. Among them, the most widely used fiber optic gyroscope has the advantages of short start-up time, simple structure, light weight, no moving components, and strong environmental adaptability, which overcomes the locking phenomenon of the ring laser gyroscope, and does not require anti-mechanical jitter measures. The gyroscope has become the core device for realizing the key technologies of carrier attitude and trajectory control. In addition, fiber optic hydrophones are used in inertial navigation and sonar, and have extremely high application value in the milit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/024C03B37/027C03C25/106C03C25/1065
CPCG02B6/024C03B37/02709C03C25/48C03C25/106C03C25/1065C03B2203/10C03B2203/34C03B2205/51
Inventor 肖敏杨思美柳涛蔡钊
Owner 武汉库克光电技术有限公司
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