Full optical fiber reenterable differential interferometer

A differential interference and all-fiber technology, which is applied in the field of fiber optic sensing and all-fiber interference, can solve the problems of cost, system insensitivity, and complex structure, and achieve the elimination of reciprocity changes, high phase sensitivity, and system anti-interference ability strong effect

Inactive Publication Date: 2011-08-24
SHANGHAI BOOM FIBER SENSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Optical interference has been widely used in the field of sensing testing and communication technology, especially in perimeter security, the technology of using optical interferometry to measure vibration and stress signals is becoming more and more perfect. The structure of the system for measuring vibration signals is usually relatively complicated, and the resulting cost problems and system insensitivity problems have not been completely solved

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Examples

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Effect test

Embodiment 1

[0020] Embodiment 1: An all-fiber reentrant differential interferometer is composed of a 3×3 fiber coupler 1 , a light source 2 , a photodetector 3 , a delay fiber 4 , a detection fiber 5 and two mirrors 6 and 7 . Its structural features are as figure 1 As shown: the light source 2 and the photodetector 3 are respectively connected to an input end and an output end of the 3×3 fiber coupler 1, and the two input ends of the 3×3 fiber coupler 1 are connected through a delay fiber 4, and the 3×3 fiber coupler 1 is connected to each other through a delay fiber 4. 3. The two output ends of the fiber coupler 1 are respectively connected to a section of detection fiber 5 and a short section of fiber, and the ends of these two sections of fiber are connected to a reflection mirror 7 and a reflection device 6 respectively.

[0021] The two coherent optical paths of the present invention are:

[0022] (1) Light source 2-fiber coupler 1-detection fiber 5-mirror 7-detection fiber 5-fiber ...

Embodiment 2

[0026] Embodiment 2: An all-fiber reentrant differential interferometer, consisting of a 3×3 fiber coupler 1, a light source 2, a photodetector 3, a delay fiber 4, a detection fiber 5, and two mirrors 6 and 7. Its structural features are as figure 2 As shown: the light source 2 and the photodetector 3 are respectively connected to an input end and an output end of the 3×3 fiber coupler 1, and the two output ends of the 3×3 fiber coupler 1 are connected through a delay fiber 4, and the 3×3 fiber coupler 1 is connected to each other through a delay fiber 4. 3 The two input ends of the fiber coupler 1 are respectively connected to a section of detection fiber 5 and a short section of fiber, and the ends of these two sections of fiber are connected to a reflection mirror 7 and a reflection device 6 respectively.

[0027] The two coherent optical paths of the present invention are:

[0028] (1) Light source 2-fiber coupler 1-delay fiber 4-fiber coupler 1-mirror 6-fiber coupler 1-...

Embodiment 3

[0032] Embodiment 3: An all-fiber reentrant differential interferometer, consisting of a 3×3 fiber coupler 1, a light source 2, a photodetector 3, a delay fiber 4, a detection fiber 5, and two mirrors 6 and 7. Its structural features are as image 3 As shown: the light source 2 and the photodetector 3 are connected to the two input ends of the 3×3 fiber coupler 1, and the other input end of the 3×3 fiber coupler 1 is connected to the reflector 7 through the detection fiber 5, 3×3 The two output ends of the fiber coupler 1 are connected through a delay fiber 4 , and the other output end of the 3×3 fiber coupler 1 is connected with a reflection mirror 6 through a short length of fiber.

[0033] The two coherent optical paths of the present invention are:

[0034] (1) Light source 2-fiber coupler 1-delay fiber 4-fiber coupler 1-detection fiber 5-mirror 7-detection fiber 5-fiber coupler 1-mirror 6-fiber coupler 1-photodetector 3 ;

[0035] (2) Light source 2-fiber coupler 1-mir...

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Abstract

The invention discloses a full optical fiber reenterable differential interferometer, which belongs to the technical field of optical fibers. The structure of the full optical fiber reenterable differential interferometer is characterized in that: a light source and a light receiving module are connected with one input end of an optical fiber coupler respectively; the other input end of the optical fiber coupler is connected with one output end of the optical fiber coupler through a delay optical fiber; and the other two output ends of the optical fiber coupler are connected together through a sensing optical fiber. Therefore, two coherent lights interfere with each other in the light receiving module. The system can be used in interference systems with any phase, particularly in systems with unstable interference signal range.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to the technical field of all optical fiber interference. Background technique [0002] Optical interference has been widely used in the field of sensing testing and communication technology, especially in perimeter security, the technology of using optical interferometry to measure vibration and stress signals is becoming more and more perfect. The structure of the system for measuring vibration signals is usually relatively complex, and the resulting cost problems and system insensitivity problems have not been completely solved. Contents of the invention [0003] In order to solve the deficiencies of the prior art, the invention provides an all-fiber reentrant differential interferometer. The object of the present invention is achieved as follows: an all-fiber reentrant differential interferometer is composed of a light source, a photodetector, a fiber coupler, a...

Claims

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Application Information

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IPC IPC(8): G01H9/00G02B6/26
Inventor 郭兆坤皋魏席刚仝芳轩周正仙
Owner SHANGHAI BOOM FIBER SENSING TECH
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