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Smelting embedded hollow multi-core polarization-preserving fiber and preparation method thereof

A polarization-maintaining optical fiber and optical fiber technology, applied in polarized optical fiber, clad optical fiber, optical waveguide light guide, etc., can solve the problems of inability to maintain the linear polarization state, and achieve the effects of low cost, high strength, and simple preparation process

Inactive Publication Date: 2012-01-04
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In ordinary communication optical fiber, due to its circular symmetry structure, after a certain distance of transmission, the incident linearly polarized light will become elliptical or circularly polarized light due to the coupling and energy exchange of different polarization modes and cannot maintain the linear polarization state.

Method used

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  • Smelting embedded hollow multi-core polarization-preserving fiber and preparation method thereof
  • Smelting embedded hollow multi-core polarization-preserving fiber and preparation method thereof
  • Smelting embedded hollow multi-core polarization-preserving fiber and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as Figure 1-a As shown, a fusion-embedded hollow dual-core polarization-maintaining fiber. It consists of quartz cladding 1, elliptical core 2 and capillary pores 3 from outside to inside. Its structural features are: two elliptical cores are symmetrically fused on the inner wall of the quartz capillary, and the major axis and minor axis directions of the two ellipses are respectively the same; the side close to the inner wall of the capillary forms a thick quartz cladding 1-1, and the other The side is exposed to the capillary air to form a thin quartz cladding 1-2; the refractive index of the elliptical core 2 is greater than that of the quartz cladding 1; the center of the optical fiber has a capillary structure.

[0034] A method for preparing a fusion-embedded hollow dual-core polarization-maintaining optical fiber, comprising the following specific steps:

[0035] (1) A large-core optical fiber preform with a core-to-clad ratio of 1:2 is prepared by a known...

Embodiment 2

[0040] Such as Figure 2-aAs shown, a fusion-embedded hollow three-core polarization-maintaining fiber. The main difference between Example 2 and Example 1 is: inside the fusion-embedded hollow three-core polarization-maintaining fiber, the three optical fiber cores are arranged in an equilateral triangle, and the long axis (short axis) direction of each ellipse core is the same as that of the adjacent ellipse. The direction of the major axis (minor axis) of the core is at an angle of 60 degrees.

[0041] The preparation method of this embodiment is the same as that of Example 1.

Embodiment 3

[0043] Such as Figure 3-a As shown, a fusion-embedded hollow four-core polarization-maintaining fiber. The main difference between Example 2 and Example 1 is: inside the fused-embedded hollow quadruple-core polarization-maintaining fiber, the four fiber cores are arranged in a regular quadrilateral, and the long axis (short axis) direction of a pair of elliptical cores is the same as that of the other pair of double elliptical cores. The major axis (short axis) directions of the cores are perpendicular to each other.

[0044] The preparation method of this embodiment is the same as that of Example 1.

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Abstract

The invention provides a smelting embedded hollow multi-core polarization-preserving fiber and a preparation method thereof. The preparation method comprises the following steps of: preparing a fiber with a certain core / cladding ratio by adopting the known MCVD process, wherein the refractive index of the core of the fiber is greater than that of the cladding, and the refractive index of the cladding is the same as that of an outer quartz tube; sintering the fiber onto the inner wall of the quartz tube by using oxyhydrogen flames along the axial direction of the quartz tube so as to form a precast bar; and performing wire drawing at normal wiredrawing temperature by using a fiber drawing tower to make the fiber elliptic or similar elliptic and attached to the inner wall of a capillary tube. The smelting embedded hollow multi-core polarization-preserving fiber is characterized in that: the cross-section structure comprises the cladding, the elliptical core and a capillary pore respectively from the outside to the inside; the elliptic core is smelted and embedded onto the inner wall of the quartz capillary tube; and one side close to the inner wall of the capillary tube forms a thick quartz cladding, and the other side is exposed in the air in the capillary pore to form a thin quartz cladding, wherein the refractive index of the elliptic core is greater than that of the quartz cladding. The fiber prepared by the method has the advantages of high strength, simple preparation process and low cost.

Description

technical field [0001] The invention belongs to the technical field of optical fibers, and relates to a multi-core polarization-maintaining optical fiber, in particular to a fusion-embedded hollow multi-core polarization-maintaining optical fiber and a preparation method thereof. Background technique [0002] Polarization maintaining fiber, also known as polarization maintaining fiber, is a kind of special fiber. It is widely used in the communication system of wavelength division multiplexing and the field of optical fiber sensor. Especially in the field of fiber optic sensors, it is the core sensing component of military sensors such as fiber optic gyroscopes, fiber optic hydrophones, and optical integrated devices. Because fiber optic gyroscopes and fiber optic hydrophones can be used in military inertial navigation and sonar, they are high-tech products, and polarization-maintaining optical fibers are their core components, so polarization-maintaining optical fibers hav...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/024G02B6/02
Inventor 田凤军刘志海戴强苑立波
Owner HARBIN ENG UNIV