Multimode optical fiber, application thereof and temperature measuring system

A multimode fiber, wavelength division multiplexer technology, applied in cladding fiber, optical radiation measurement, graded index fiber core/cladding fiber, etc., can solve the problem of limited sensing distance, insufficient temperature measurement length, optical fiber Attenuation reduction and other issues, to achieve the effect of high bandwidth, improved temperature measurement distance, and high signal-to-noise ratio

Active Publication Date: 2017-09-05
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a multimode optical fiber for temperature measurement, its application and a temperature measurement system, the purpose of which is to realize the working band, anti-Stokes Raman The light attenuation of scattered light (1450nm) and Stokes Raman scattered light (1660nm) is significantly reduced, thus solving the technical problems of the existing distributed temperature measurement optical fiber, limited sensing distance and insufficient temperature measurement length

Method used

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  • Multimode optical fiber, application thereof and temperature measuring system
  • Multimode optical fiber, application thereof and temperature measuring system
  • Multimode optical fiber, application thereof and temperature measuring system

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Embodiment 1 to 4

[0051] Embodiment 1 to 4 temperature measurement multimode optical fiber

[0052] According to the above scheme design, a group of optical fibers were prepared, the core layer of which was SiO2 co-doped with germanium / fluorine. 2 Quartz glass, the cladding is high-purity quartz glass, and its relevant parameters are shown in Table 1:

[0053] Table 1

[0054] 1 2 3 4 Refractive index distribution index α 1.92 1.86 1.89 1.85 △1％ 1.102 1.03 1.15 1.10 R1(μm) 24.81 25.01 24.9 24.77 R2(μm) 62.3 62.2 62.7 62.1 Numerical aperture 0.193 0.194 0.204 0.196 Bandwidth@1550nm(MHz*km)

351 1193 573 1252 Attenuation@1300nm(dB / km)

0.43 0.43 0.45 0.44 Attenuation@1450nm(dB / km)

0.334 0.371 0.362 0.377 Attenuation@1550nm(dB / km)

0.25 0.25 0.25 0.26

[0055] Embodiments 5 to 8 distributed temperature measurement system, the application of the multimode fiber in Embodiments 1 to 4, the ...

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Abstract

The invention discloses a multimode optical fiber, application thereof and a temperature measuring system. The multimode optical fiber comprises a core layer and a cladding layer covering the core layer; the radius of the core layer is 23.75-26.25 micrometers, the refractive index profile of the core layer is in gradient refractive index distribution, the index distribution index alpha is 1.80-1.89, the relative refractive index difference delta1% of the core layer is 1.0-1.15%, and the fusion loss is smaller than or equal to 0.08 dB. The optical fiber is applied to the middle-long-distance distributed temperature measuring system, and the temperature measuring distance of the system reaches 10-27 km. The system comprises a pulse light source, a wavelength division multiplexer, an avalanche diode, a data acquisition device, an upper computer and the temperature measuring multimode optical fiber. The multimode optical fiber is high in temperature measuring space resolution, high in temperature measuring precision and long in measuring distance. The temperature measuring system is simple in structure, high in signal-to-noise ratio and accurate in result.

Description

technical field [0001] The invention belongs to the field of temperature-measuring multi-mode optical fibers, and more specifically relates to a multi-mode optical fiber, its application and a temperature-measuring system. Background technique [0002] Temperature measurement and control play an extremely important role in aerospace, materials, energy, metallurgy and other fields. Distributed optical fiber temperature measurement is an emerging contact temperature measurement technology. It uses optical fiber as the carrier of temperature information sensing and signal transmission. It has continuous temperature measurement, distributed temperature measurement, real-time temperature measurement, anti-electromagnetic interference, intrinsic Safety, remote monitoring, high sensitivity, easy installation, long life and other characteristics, widely used in pipelines, tunnels, cables, petroleum and petrochemical, coal mines and other industries. [0003] The distributed optical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/028G01K11/32G01K11/324
CPCG01K11/32G02B6/0288G02B6/0281G01K11/324G01J3/0218
Inventor 汪振东汪松刘彤庆杨晨茅昕童维军
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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