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Device for Improving Temperature Resolution of Long-Distance BODR Systems Using Distributed Raman Amplification and EDFA Techniques

A Raman amplification, system temperature technology, applied in special recording/indicating devices, using optical devices to transmit sensing components, measuring devices, etc., can solve complex, low temperature resolution, continuous Raman pumping laser peak power limitation and other problems to achieve the effect of weakening interference and reducing noise power

Active Publication Date: 2018-07-03
HUNAN HAIDUN OPTICAL FIBER SENSING TECH ENG LAB
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Problems solved by technology

[0003] In order to improve the sensing distance and temperature resolution of the BOTDR system, distributed Raman amplification technology can be used, but the peak power of the continuous Raman pump laser is limited, and the sensing distance cannot be very far. The increase of the sensing distance, at the end of the sensing fiber, the temperature resolution will be very low
At present, the SNR of the system can be improved by adopting the coding technology and the system average method, thereby increasing the sensing distance. However, the improvement of the SNR of the system by the coding technology must be within a certain range of code length. After the length of the code length increases, the signal-to-noise ratio of the system can no longer be improved by using the coding technology, and the temperature resolution can no longer be improved, and when the system response of the coded signal is demodulated, it is realized on the hardware It is more complicated; while the system average method is used to improve the sensing distance of the system, it greatly increases the measurement time of the system

Method used

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  • Device for Improving Temperature Resolution of Long-Distance BODR Systems Using Distributed Raman Amplification and EDFA Techniques
  • Device for Improving Temperature Resolution of Long-Distance BODR Systems Using Distributed Raman Amplification and EDFA Techniques
  • Device for Improving Temperature Resolution of Long-Distance BODR Systems Using Distributed Raman Amplification and EDFA Techniques

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Embodiment Construction

[0018] see figure 1 , the present invention includes 1480nm Raman fiber laser, 1535nm probe light generating device, WDM (wavelength division multiplexer), optical circulator, first fiber grating, second fiber grating, third fiber grating, coupler, photodetector , optical isolator, VOA (optical attenuator), polarization controller (PS), acousto-optic modulator (AOM), electro-optic modulator (EOM), first sensing fiber, second sensing fiber, EDFA, heating device , Spectrum analyzer, the above-mentioned pulsed light produced by the 1535nm probe light, 1480nm Raman fiber laser and some optical devices has the same polarization direction and sufficient optical power, and is introduced into the electro-optic modulator through the coupler 1. It is modulated with a frequency of 11GHz to generate local light after frequency shifting. The other light is amplified by a 45km sensing fiber and EDFA, and then enters another part of the sensing fiber through a heating device. When the fiber...

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Abstract

The invention discloses a device for improving the temperature resolution of a long-distance BOTDR system by using distributed Raman amplification and EDFA technology. And the comparison chart of temperature resolution obtained by using this method and conventional method. The device of the invention can improve the temperature resolution of the long-distance BOTDR system.

Description

technical field [0001] The invention relates to a device for improving the temperature resolution of a long-distance BOTDR system by using distributed Raman amplification and EDFA technology. Background technique [0002] In recent years, distributed optical fiber sensing technology based on self-published Rieouin scattering has attracted widespread attention, and it has huge market potential. This technology requires long-distance monitoring in pipelines, cables, bridges, railways and other fields. However, the power of the self-published Brillouin scattering signal is very weak. As the sensing distance increases, the consumption of the pump will make the power of the Brillouin scattering signal weaker, and the signal-to-noise ratio of the system will become lower. The worse the temperature becomes, the lower the temperature resolution of the system will be. Therefore, how to improve the temperature resolution of the long-distance BOTDR system has become a research hotspot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353G01D3/036
Inventor 熊玉华李友如陶令胡艳红甘地高才彭涛任伟
Owner HUNAN HAIDUN OPTICAL FIBER SENSING TECH ENG LAB
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