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Long-distance high-capacity quasi-distributed sensing system based on optical fiber random laser

A random laser, quasi-distributed technology, applied in the direction of using optical devices to transmit sensing components, converting sensor output, measuring devices, etc., can solve the problems of short sensing distance, increase relay stations, etc., achieve long sensing distance, overcome the Fiber connector and coupler loss, the effect of high multiplexing capability

Inactive Publication Date: 2020-06-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the technical problem of short sensing distance and the need to increase the number of relay stations when the optical transmission of existing high-voltage transmission lines is limited, the present invention provides a long-distance sensor based on optical fiber random laser Large-capacity quasi-distributed sensing system can extend the sensing distance of the optical fiber sensing system and improve the multiplexing capability of the optical fiber sensing system

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  • Long-distance high-capacity quasi-distributed sensing system based on optical fiber random laser
  • Long-distance high-capacity quasi-distributed sensing system based on optical fiber random laser
  • Long-distance high-capacity quasi-distributed sensing system based on optical fiber random laser

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Embodiment 1

[0031] Such as figure 1As shown, this embodiment provides a long-distance and large-capacity quasi-distributed sensing system based on fiber random lasers, which is a quasi-distributed sensing system based on second-order fiber random lasers. The frequency of the first-order random lasers is shifted by about 13 THz relative to the frequency of the pump light. , the second-order random laser frequency is shifted by about 26THz relative to the pump light frequency. The system includes a wavelength-tunable pump laser 1, an isolator 2, a spectral analysis module 3, a wavelength division multiplexer 4, multi-coil single-mode optical fibers 5 with different lengths, 10 fiber Bragg gratings 6 with different central wavelengths, and optical fibers ring mirror7. Wherein, described wavelength division multiplexer 4 comprises 1 port, 2 ports, 3 ports and common port, and the input port of spectral analysis module 3 is connected with 1 port of wavelength division multiplexer 4, and the o...

Embodiment 2

[0034] Such as figure 2 As mentioned above, the long-distance and large-capacity quasi-distributed sensing system based on fiber random laser is a quasi-distributed sensing system based on third-order fiber random laser. The pump light wavelength is 12XXnm, the first-order random laser wavelength is 13XXnm, the second-order random laser wavelength is 14XXnm, and the third-order random laser wavelength is 15XXnm. The system includes pump laser 1 with adjustable wavelength, isolator 2, fiber loop mirror 7-1 capable of reflecting 13XXnm wavelength, 1:99 coupler 8, multi-coil single-mode optical fiber with different lengths 5, and 10 with different center wavelengths A fiber Bragg grating 6, a fiber loop mirror 7-2 capable of reflecting a wavelength of 14XXnm, a wavelength division multiplexer 4 and a spectrum analysis module 3. Wherein, described wavelength division multiplexer 4 comprises 1 port, 2 ports, 3 ports and common port, the optical fiber loop mirror 7-1 that can refl...

Embodiment 3

[0037] see image 3 , the long-distance and large-capacity quasi-distributed sensing system based on fiber random laser is a quasi-distributed sensing system based on fourth-order fiber random laser. The pump light wavelength is 11XXnm, the first-order random laser wavelength is 12XXnm, the second-order random laser wavelength is 13XXnm, the third-order random laser wavelength is 14XXnm, and the fourth-order random laser wavelength is 15XXnm. The system includes pump laser 1 with adjustable wavelength, isolator 2, fiber loop mirror 7-1 capable of reflecting 13XXnm wavelength, 1:99 coupler 8, multi-coil single-mode optical fiber with different lengths 5, and 10 with different center wavelengths A fiber Bragg grating 6, a fiber loop mirror 7-2 capable of reflecting a wavelength of 14XXnm, a wavelength division multiplexer 4, a broadband FBG9 with a center wavelength of 1280nm, and a spectrum analysis module 3. Wherein, described wavelength division multiplexer 4 comprises 1 por...

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Abstract

The invention, which relates to the technical field of optical fiber sensing, discloses a long-distance high-capacity quasi-distributed sensing system based on optical fiber random laser. The system comprises a pump laser with adjustable wavelength and broadband, an isolator, a wave combining module, a spectral analysis module, a sensing optical fiber and an FBG (Fiber Bragg Grating) sensor. The long-distance high-capacity quasi-distributed sensing system has the advantages of simple structure, long sensing distance and strong reuse capability. During use, the pump laser is turned on, the output wavelength and the output power of the pump laser are adjusted, and the sensing quantity carried by the sensor at a specific position can be demodulated through the spectral analysis module., The FBG sensors arranged at different positions of the optical fiber can be selected by changing the output wavelength and the output power of the pump; and the change of the external physical quantity isreflected through the wavelength change of the currently selected FBG sensor.

Description

technical field [0001] The invention relates to the field of optical fiber sensing, in particular to a long-distance and large-capacity quasi-distributed sensing system based on optical fiber random laser. Background technique [0002] Before 2007, random lasers were all two-dimensional or three-dimensional structures. Such random lasers had the disadvantages of different output laser directions, poor output laser controllability, and high lasing threshold. In order to improve these shortcomings, in 2007, researchers such as C. deMatos realized random laser lasing in the optical fiber for the first time, realized the directional output of random laser, and reduced the random laser geometry to quasi-one-dimensional. Compared with traditional lasers, the most obvious difference in structure between random lasers is that they do not have optical resonators with clear boundaries and parameters in traditional lasers, but random scattering media provide feedback for the generation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/353
CPCG01D5/35316G01D5/35387
Inventor 王子南陈思琦曹健华林圣淘饶云江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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