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Method for measuring temperature through fiber core mismatching interference structure

A technology of interference structure and fiber core mismatch, which is applied in the field of optical communication and can solve problems such as limitations

Inactive Publication Date: 2016-12-07
BEIJING INFORMATION SCI & TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these fiber optic sensors have shortcomings, which are limited in practical application.

Method used

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  • Method for measuring temperature through fiber core mismatching interference structure
  • Method for measuring temperature through fiber core mismatching interference structure
  • Method for measuring temperature through fiber core mismatching interference structure

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Embodiment Construction

[0018] Core mismatch is the core mismatch during fiber splicing. According to the principle of core mismatch, the core mismatch interference structure is a special Mach-Zehnder interferometer. In the single mode-multimode-single mode (Single mode-Multi mode-Singlemode, SMS) structure (such as figure 1 As shown), the single-mode fiber at the input end couples the incident light into the single-mode fiber with dislocated core. After modulation by the multi-mode fiber, the incident light is led out through the single-mode fiber at the output end, and the light wave mode is transmitted along the optical fiber. In the transmission direction There will be a phenomenon that the light intensity changes periodically with the length of the multimode fiber, and even the light field distribution in the multimode fiber is almost the same as the incident light field. This is the mode interference effect in the multimode fiber, also called the mode Because the interference between multiple m...

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Abstract

The invention discloses a method for measuring the temperature through a fiber core mismatching interference structure. The method comprises the following steps that 1, a fiber core dislocation welding interference structure is built, wherein the fiber core dislocation welding interference structure comprises a pumping source, a wavelength division multiplexer, a gain optical fiber, a first single-mode optical fiber, a second single-mode optical fiber, a third single-mode optical fiber and an optical spectrum analyzer which are sequentially connected; 2, fiber core dislocation welding is conducted on the first single-mode optical fiber, the second single-mode optical fiber and the third single-mode optical fiber; 3, the outside temperature of a temperature control device to be measured is measured, wherein the first single-mode optical fiber, the second single-mode optical fiber, the third single-mode optical fiber and the temperature control device are combined into a whole, the moving length of a comb-shaped spectrum is recorded according to the changes of wavelength values of the wave trough at the different temperatures to obtain a changing curve of the comb-shaped spectrum along with the temperature, the wavelength of a measuring point is selected, the optical spectrum wavelength curve drifts at the moment, and the outside temperature can be deduced according to the drift distance through the following formula of Y=aX-b, wherein X represents the temperature, Y represents the changing wavelength, and a and b represent constants.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method for measuring temperature by using a fiber core mismatch interference structure. Background technique [0002] The all-fiber sensor has the advantages of compact structure, long service life, sensitivity to test volume, and multiple transmission channels, and is widely used in optical fiber sensing, optical fiber communication, optical processing and other fields. Through the micro-machining technology of the fiber end face or building an all-fiber sensor with an interference structure, under the action of the pump source, an interference spectrum curve with a comb-like spectrum pattern is output. The thin-core optical fiber Mach-Zehnder optical fiber sensor has a simple structure and is easy to implement. The structure consists of a thin-core optical fiber welded to two relatively thick core-diameter doped rare-earth optical fibers. The doped rare-earth optical fibe...

Claims

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Application Information

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IPC IPC(8): G01K11/32
CPCG01K11/32
Inventor 祝连庆何巍董明利娄小平刘锋闫光李红
Owner BEIJING INFORMATION SCI & TECH UNIV
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