Mach-Zehnder interferometer based on three-core optical fiber

A three-core fiber, interferometer technology, applied in the direction of multi-layer core/clad fiber, clad fiber, optical waveguide coupling, etc. Effects of weight reduction, high coherence requirements, high environmental tolerance

Inactive Publication Date: 2013-10-09
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application 200710072625.9 proposes a fiber-integrated Mach-Zehnder interferometer and its manufacturing method. Since there is no decoupling design between the two cores of the dual-core optical fiber, the optical power is strongly coupled between the two cores and the sensitivity is low.
Chinese patent application 200910044806.X proposes a Mach-Zehnder interferometer based on coaxial optical fiber. This interferometer is formed by alternately connecting multiple sections of coaxial optical fiber and single-mode optical fiber, which is complicated to manufacture and high in cost.
This kind of interferometer needs to be fused and tapered betwe

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  • Mach-Zehnder interferometer based on three-core optical fiber
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  • Mach-Zehnder interferometer based on three-core optical fiber

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Effect test

Embodiment 1

[0020] A Mach-Zehnder interferometer based on a three-core fiber, such as figure 1 , figure 2 Shown is a schematic diagram of the Mach-Zehnder interferometer with single-mode input and single-mode output. In the figure, the interferometer is composed of a broadband light source, a single-mode input fiber 1, a three-core fiber 3, a single-mode output fiber 6 and a spectrum analyzer connected in sequence. The three-core optical fiber 3 includes a first core 31, a second core 32 and a third core 33, the three cores are arranged in parallel at equal intervals, and the second core 32 is located between the first core 31 and the third core. In the middle of the core 33, one end of the single-mode input fiber core 2 and the second fiber core 32 is fused, and the other end of the single-mode output fiber core 7 and the second fiber core 32 is fused; in the middle of the three fiber cores, the second fiber The middle position of the core 32 is cut with a laser to cut out the air lay...

Embodiment 2

[0025] image 3 Shown is a schematic diagram of the structure of a Mach-Zehnder interferometer with multi-mode input and single-mode output. In the figure, in the interferometer structure, the single-mode input fiber core 2 adopts the multi-mode input fiber core, so that the single-mode input fiber 1 becomes a multi-mode input fiber, and the connection relationship of the various components is the same as that of the first embodiment. The shortest distance h between the relative edges of the first core 31 and the third core 33 is 130 μm, the length L of the air layer 4 is 49 km, and the width d is 110 μm (such as figure 2 shown) to clean the optical fiber connection, and then encapsulate and cure with epoxy resin 5.

[0026] The working process of the Mach-Zehnder interferometer with multi-mode input and single-mode output is the same as the first embodiment. The lengths of the multimode input optical fiber 1 and the single-mode output optical fiber 6 described in this embo...

Embodiment 3

[0028] Figure 4Shown is a schematic diagram of the Mach-Zehnder interferometer structure using single-mode input and multi-mode output; in the figure, in the interferometer structure, the single-mode output fiber core 7 adopts the multi-mode output fiber core, so that the single-mode output fiber 6 It becomes a multimode output optical fiber, and the connection relationship of the various components is the same as that of the first embodiment. The shortest distance h between the relative edges of the first core 31 and the third core 33 is 450 μm, the length L of the air layer 4 is 99 km, and the width d is 430 μm (such as figure 2 shown) to clean the optical fiber connection, and then encapsulate and cure with epoxy resin 5.

[0029] The working process of the Mach-Zehnder interferometer with single-mode input and multi-mode output is the same as that of Embodiment 1. The lengths of the single-mode input optical fiber 1 and the multimode output optical fiber 6 described in...

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Abstract

The invention discloses a Mach-Zehnder interferometer based on a three-core optical fiber and belongs to the technical field of optical fiber sensing and optical fiber communication. The Mach-Zehnder interferometer based on the three-core optical fiber is formed by sequential connection of a broadband light source, an input optical fiber, the three-core optical fiber, an output optical fiber and a spectrum analyzer, wherein the three-core optical fiber comprises a first fiber core, a second fiber core and a third fiber core, the three fiber cores are arranged in sequence at intervals in parallel, the middle position of the second fiber core is used for cutting out an air layer by a laser, and the position where the optical fibers are welded is cleaned and then is packaged and solidified by means of epoxy resin. The Mach-Zehnder interferometer based on the three-core optical fiber solves the problem that an existing interferometer is poor in temperature stability, low in sensitivity, and high in light source coherence requirements.

Description

technical field [0001] The invention belongs to the technical fields of optical fiber sensing and optical fiber communication, and in particular relates to a Mach-Zehnder interferometer based on a three-core optical fiber. Background technique [0002] Optical fiber Mach-Zehnder interferometer has the advantages of small insertion loss, good compatibility with optical fiber, and comb filtering characteristics, and has important application value in the fields of optical fiber sensing and optical fiber communication. [0003] The traditional fiber optic Mach-Zehnder interferometer consists of two fiber couplers connected in series. Optical signals are input to two independent optical fiber interference arms through the first coupler to form coherent light, and then output through the second coupler to form interference. When external environmental parameters such as strain and displacement act on the sensing arm, the wavelength shift of the spectrum will occur, and then the ...

Claims

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Application Information

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IPC IPC(8): G02B6/26G02B6/036G02B6/255G01D5/353
Inventor 刘胜春
Owner BEIJING JIAOTONG UNIV
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