Ellipse core panda type polarization maintaining optical fiber and manufacturing method thereof

A polarization-maintaining optical fiber and a production method technology, applied in the directions of light guides, optics, optical components, etc., can solve the problem that the optical fiber cannot be integrated, and achieve the effect of not easy to crack in the stress area, strong birefringence performance, and reducing the volume of the gyroscope.

Inactive Publication Date: 2016-12-07
武汉长盈通光电技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that, aiming at the problem that the optical fibers used in the ring and waveguide in the existing fiber optic gyroscope cannot be integrated, an elliptical core panda-type polarization-maintaining optical fiber and its manufacturing method are proposed, which solves the problem that the ring and waveguide cannot be integrated. The technical problem of integrated fiber, low fiber loss, strong birefringence, increased grindability while maintaining polarization performance

Method used

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  • Ellipse core panda type polarization maintaining optical fiber and manufacturing method thereof
  • Ellipse core panda type polarization maintaining optical fiber and manufacturing method thereof
  • Ellipse core panda type polarization maintaining optical fiber and manufacturing method thereof

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Embodiment 1

[0043] Embodiment 1: The manufacturing method of elliptical-core panda-type polarization-maintaining optical fiber comprises the following steps:

[0044] Step 1, using Chemical Vapour Deposition (CVD) technology to prepare mandrels, using Modified Chemical Vapour Deposition (MCVD) or Furnace Chemical Vapor Deposition (FCVD) to prepare large core diameter and high numerical aperture Numerical Aperture (NA) mandrels, according to the core diameter and numerical aperture NA controls the mode field diameter and cut-off wavelength of the fiber;

[0045] Step 2: The mandrel is flattened and stretched. After the periphery of the mandrel is ground to a suitable size, the long and short axes are flattened according to different proportions, and then stretched. During the stretching process, the core area changes from circular to elliptical, and the outer circle becomes Round, according to the ratio of flat grinding to control the ratio of the long and short axes of the fiber core diam...

Embodiment 2

[0049] Embodiment 2: The manufacturing method of elliptical-core panda-type polarization-maintaining optical fiber comprises the following steps:

[0050] Step 1, using CVD technology to prepare the core rod, preparing a large core diameter and high numerical aperture NA core rod, and controlling the mode field diameter and cut-off wavelength of the optical fiber according to the core diameter and numerical aperture NA;

[0051] Step 2: The mandrel is flattened and stretched, and the periphery of the mandrel is ground to a suitable size, and then stretched to a suitable size;

[0052] Step 3, melting and punching and shaping, select a suitable diamond-shaped sleeve for melting and shrinking, punch holes in the long axis direction according to different spacings after melting, and then shape in the short axis direction to ensure the roundness of the optical fiber cladding, and adjust according to the hole spacing Fiber stress birefringence performance and attenuation;

[0053]...

Embodiment 3

[0055] Embodiment 3: The manufacturing method of elliptical-core panda-type polarization-maintaining optical fiber comprises the following steps:

[0056] Step 1, using CVD technology to prepare a core rod, using MCVD or FCVD to prepare a large core diameter and high numerical aperture NA core rod, and controlling the mode field diameter and cut-off wavelength of the optical fiber according to the core diameter and numerical aperture NA;

[0057] Step 2: The mandrel is flattened and stretched. After the periphery of the mandrel is ground to a suitable size, the long and short axes are flattened and ground according to different proportions, and then stretched. During the stretching process, the core area becomes elliptical and the outer circle becomes round. According to the flat grinding ratio, the ratio of the long and short axes of the fiber core diameter is controlled, thereby controlling the additional beat length;

[0058] Step 3, pure silicon rods are drilled and shaped...

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Abstract

The invention discloses an ellipse core panda type polarization maintaining optical fiber and a manufacturing method thereof. The polarization maintaining optical fiber comprises a fiber core, stress areas, cladding and an outer coating. The cross section of the fiber core is oval, the fiber core is arranged in the centre of the cladding, the position of the central point of the cross section of the fiber core coincides with the position of the central point of the cross section of the optical fiber, the two stress areas are symmetrically distributed on the two sides of the fiber core in the long axis direction and arranged in the cladding, and the outer coating is arranged on the outer side of the cladding. The manufacturing method comprises the steps that a core rod is prepared through a CVD method, and a core rod with the large core diameter and the high numerical aperture is prepare; the core rod is subjected to flat grinding and stretching the core rod is finished into an ellipse core rod, a hole is formed in the long axis direction, and finishing is carried out in the short axis direction; two stress rods are prepared; an optical fiber preform is formed through the core rod, the stress rods and the pure silicon cladding, and finally RIT wire drawing is carried out on the optical fiber preform, and the ellipse core panda type polarization maintaining optical fiber is manufactured. The optical fiber is low in loss, high in double refraction performance and good in temperature performance, and grinding performance is improved while polarization performance is kept.

Description

technical field [0001] The invention belongs to the technical field of polarization-maintaining optical fibers, and in particular relates to an elliptical-core panda-type polarization-maintaining optical fiber and a manufacturing method thereof. Background technique [0002] An interferometric fiber optic gyroscope is a fiber optic sensor used for inertial navigation, also known as a solid-state gyroscope because there are no moving parts. The sensitive components of the interferometric fiber optic gyroscope are the polarization maintaining fiber ring and the Y-shaped waveguide. Usually, the polarization maintaining fiber ring adopts panda type, bow tie type, elliptical cladding type, elliptical core type and polarization maintaining photonic crystal fiber. Although the design structure of optical fibers is quite different, they are mainly divided into two categories: (1) stress region type polarization maintaining fiber; (2) geometric birefringence polarization maintaining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/10
CPCG02B6/105
Inventor 廉正刚徐江河陈翔皮亚斌曹宇青谢利华余倩卿
Owner 武汉长盈通光电技术股份有限公司
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