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Orthogonal inclined three-core fiber bragg grating parallel integrated Mach-Zehnder interferometer

A technology of inclined grating and three-core optical fiber, which is applied in instruments, uses optical devices to transmit sensing components, converts sensor output, etc., can solve problems such as unstable interference signals and affecting the mechanical strength of optical fibers, and achieve stable splitting ratio and integration High, small size effect

Active Publication Date: 2020-04-07
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of tapered coupling beam splitting method needs to thin the fiber, which affects the mechanical strength of the fiber, and the splitting ratio of the tapered coupling area is greatly affected by the external environment, resulting in the instability of the interference signal

Method used

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  • Orthogonal inclined three-core fiber bragg grating parallel integrated Mach-Zehnder interferometer
  • Orthogonal inclined three-core fiber bragg grating parallel integrated Mach-Zehnder interferometer
  • Orthogonal inclined three-core fiber bragg grating parallel integrated Mach-Zehnder interferometer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as Figure 5 Shown is the system diagram of the parallel integrated Mach-Zehnder interferometer with orthogonal tilted three-core fiber gratings. The 45-degree inclined grating on the three-core optical fiber can make part of the light transmitted to the grating in the core be reflected, and the other part be transmitted, so it plays the role of beam splitting and beam combining. The beam is split and combined by three pairs of orthogonal 45-degree inclined gratings to form a parallel two-way Mach-Zehnder interferometer.

[0043] One of the two interferometers is three-beam interference, which is output by the first fiber core 1-1, and input to the photodetector 8-1 for detection through the first channel 7-1 of the three-core fiber fan-out device. Such as Figure 6 Shown are the paths traveled by the three beams in the three-beam interferometer respectively, then:

[0044]

[0045] where I 1 , I 2 , I 3 are the output intensities of the three beams respec...

Embodiment 2

[0061] Such as Figure 8 As shown, the structure of the three-core fiber interferometer system in this embodiment is the same as that in Embodiment 1, except that the uniform +45 degree inclined grating 2-1 / 2-2 / 2-3 in Embodiment 1 is replaced by a chirped Chirped tilted grating 9-1 / 9-2 / 9-3, replace the uniform -45 degree tilted grating 2-4 / 2-5 / 2-6 with chirped tilted grating 9-4 / 9-5 / 9- 6. The purpose is to make the beam splitting bandwidth of the tilted grating wider.

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Abstract

The invention provides an orthogonal inclined three-core fiber bragg grating parallel integrated Mach-Zehnder interferometer. The interferometer is characterized by being composed of a light source 5,a three-core optical fiber fan-in device 6, a fan-out device 7, an optical detector 8-1 / 8-2, a three-core optical fiber 1 and three pairs of orthogonal 45-degree inclined gratings on the three-core optical fiber. The 45-degree inclined grating on the three-core optical fiber can enable one part of light transmitted to the grating in the fiber core to be reflected and the other part of light to betransmitted, so that the effects of beam splitting and beam combining are achieved. The light beams form two paths of parallel Mach-Zehnder interferometers under the beam splitting and beam combiningeffects of the three pairs of orthogonal 45-degree inclined gratings. The interferometercan be applied to the sensing application fields of refractive index measurement, bending measurement and the like.

Description

[0001] (1) Technical field [0002] The invention relates to an orthogonally inclined three-core optical fiber grating parallel integrated Mach-Zehnder interferometer, which belongs to the technical field of optical fiber integrated devices. [0003] (2) Background technology [0004] Optical fiber Mach-Zehnder interferometer has a wide range of applications in the field of optical fiber sensing. A common fiber optic Mach-Zehnder interferometer is composed of two independent fibers. Usually, the light emitted by the light source is divided into two beams after passing through a 3dB fiber coupler, and then coupled into two independent fiber arms, and then combined by another 3dB fiber coupler to achieve interference. Since the two beams of this discrete optical fiber interferometer are transmitted in different optical fibers, the optical path difference between the two arms is greatly affected by environmental vibration, temperature and other factors, resulting in unstable sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35329G01D5/35374
Inventor 苑立波杨世泰
Owner GUILIN UNIV OF ELECTRONIC TECH