Microstructural low birefringence optical fiber and manufacturing method thereof

Abstract

The present invention discloses a microstructural low birefringence optical fiber and a manufacturing method thereof. The fiber comprises an optical fiber ferrule, a fiber core and an air cladding. The fiber core comprises a fiber core rod and two hollow pipes, and the fiber core rod is located at the center of the optical fiber ferrule. The air cladding is composed of a plurality of capillary hollow pipes with the same diameter, and the capillary hollow pipes are uniformly distributed around the fiber core. The two hollow pipes are respectively located at two sides of the fiber core rod and are symmetrically distributed. The microstructural low birefringence optical fiber takes one end face as an initial surface, and the internal structure of the microstructural low birefringence optical fiber has a spiral structure. The rotary microstructural fiber of the microstructural low birefringence optical fiber is formed through geometrical birefringence, has no stressed zone and only has the single material so as to solve the problem of the thermal expansion coefficient difference of a plurality of materials of the stressed zone optical fiber. The microstructural low birefringence optical fiber does not need a large-scale chemical deposition lathe so as to reduce the production technology process.

Description

technical field [0001] The invention belongs to the field of microstructure optical fiber production, in particular to a microstructure low birefringence optical fiber and a production method thereof. Background technique [0002] The application of low birefringence fiber to current transformers has begun in the 1980s. Generally, a rotating solid-core high-linear polarization-maintaining fiber is used to prepare a low-birefringence fiber. However, due to the fact that the structure of the traditional polarization-maintaining fiber contains several materials, such as: the main material in the Panda polarization-maintaining fiber is silica glass as the fiber cladding, the material of the fiber core contains germanium, and there are boron symmetrically arranged on both sides of the fiber core. Rod, and the thermal expansion coefficients of these materials are different. If the temperature of this kind of optical fiber changes rapidly during use, the light guiding performance ...

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Problems solved by technology

[0003] The present invention aims at the problem that the existing solid-core polarization-maintaining optical fiber is easily affected by temperature, and working in a state of changing temperature will affect the normal transmission of optical signals, and provides a microstructure low-birefringence optical fiber and a manufacturing method thereof. The birefringent fiber is formed by geometric birefringence, there is no stress zone, and there is only a single material, so the problem of the difference in thermal expansion coefficient of various materials in the stress zone fiber is solved.

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