Square-core multi-core fiber having different fiber core refractive indexes and preparation method

A different, multi-core optical fiber technology, applied in cladding optical fiber, glass manufacturing equipment, manufacturing tools, etc., can solve the problem of different refractive index of the fiber core, and achieve the effect of simple preparation process, convenient acquisition and flexible design

Inactive Publication Date: 2011-01-12
HARBIN ENG UNIV
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AI Technical Summary

Problems solved by technology

The purpose of the present invention is also to provide a method for preparing square-core multi-core optical fibers with different core refractive indices that can reduce the difficulty of making optical fiber preforms and solve the economical problems of multi-core optical fiber production.

Method used

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  • Square-core multi-core fiber having different fiber core refractive indexes and preparation method
  • Square-core multi-core fiber having different fiber core refractive indexes and preparation method
  • Square-core multi-core fiber having different fiber core refractive indexes and preparation method

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preparation example Construction

[0023] The invention provides a method for preparing a square-core multi-core optical fiber with different core refractive indices. The square-core multi-core optical fiber is composed of a cladding layer and several square-shaped optical fiber cores with small refractive index differences.

[0024] The preparation process of the optical fiber preform is realized by the following method: first, several kinds of large-diameter single-mode optical fiber cores with different refractive indices are prepared by the MCVD method, and several optical fiber cores of the same length are cut off to remove the coating layer spare.

[0025] Then select the outer quartz glass tube, the inner quartz glass tube and the solid quartz glass rod of appropriate size. According to the specifications of the multi-core optical fiber end face, the inner quartz tube is radially cut into a symmetrical end face structure and the radial surface of the cut glass tube is ground. The size of the cut high-pur...

specific Embodiment approach

[0036] Several types of large-diameter single-mode optical fiber cores with small differences in refractive index are prepared by MCVD method, and several optical fiber cores of the same length are cut off to remove the coating layer for later use.

[0037] Preparation of equilateral triangular three-core optical fiber preform (such asfigure 1 shown). First, use a glass cutting machine to cut the high-purity quartz glass inner casing with a diameter equal to the inner diameter of the high-purity quartz glass outer casing 1 into three equal parts in the radial direction, and then grind the cut surface of each high-purity quartz glass tube to make three parts. A block of high-purity glass tube components 3, 6, 8, the size of the three high-purity glass tube components should be equal to the diameters 2, 4, 7 of the three optical fiber cores to be inserted. The high-purity solid-core quartz glass rod 5, three high-purity quartz components, and three optical fiber cores with sligh...

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Abstract

The invention provides a square-core multi-core fiber having different fiber core refractive indexes and a preparation method. The method comprises the following steps of: segmenting and intercepting a plurality of prepared optical fiber cores with slightly different refractive indexes into segments with the same length; selecting a high-purity quartz glass bar, a high-purity quartz glass inner sleeve pipe and a high-purity quartz glass outer sleeve pipe which have proper diameters; radially cutting the high-purity quartz glass inner sleeve pipe to form a plurality of high-purity quartz members; and combining the prepared optical fiber cores with the slightly different refractive indexes, the high-purity quartz glass bar and the high-purity quartz members, inserting the combination into the high-purity quartz glass outer sleeve pipe and sealing one end of the high-purity quartz glass outer sleeve pipe to form a multi-core fiber preformed rod. As the fiber cores of the optical fibers have the slightly different refractive indexes, a same phase mask can be used for writing a plurality of fiber gratings having different reflection spectrums during the manufacturing of a multi-core fiber grating so as to manufacture various novel optical fiber devices and optical fiber sensors.

Description

technical field [0001] The invention relates to an optical fiber and a method for preparing the optical fiber, in particular to a method for preparing a square-core multi-core optical fiber with different core refractive indices. Background technique [0002] Ordinary optical fibers generally have a single-core structure, while multi-core optical fibers refer to a group of axially parallel multiple optical fiber cores contained in the optical fiber cladding. Generally, the diameter of a single fiber core is between a few microns and tens of microns, and the outer diameter of the entire fiber is 125um. Multiple fiber cores are formed by depositing some rare earth elements such as Nd, Er, Yb, Ho, Tm, Pr, Eu, Ce, Dy, Sm, Tb, Gd, Pm and other components. The optical characteristics of multi-core optical fiber are achieved by introducing light into multiple optical fiber cores, and the performance of the optical fiber mainly depends on the rare earth element composition of the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02C03B37/02
Inventor 苑立波杨军戴强张涛田凤军
Owner HARBIN ENG UNIV
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