24 October 2014 Performance enhancement for long distance BOTDR sensing system based on high extinction ratio probe pulse generator
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Abstract
The leakage light of an electro-optic modulator (EOM) induced by its finite extinction ratio (ER) may degrade the performance of Brillouin optical time domain reflectometer sensing system, especially for long distance measurement. In this letter, the configuration of a high ER probe pulse generator assisted by synchronous optical switch has been presented. A dual pulses interferometric method was also proposed to determine the dynamic ER value (DER) of the generated probe pulse. Contrast experiments have been performed to verify the effect of the proposed method in a BOTDR system and the results have shown that the performance of a long distance BOTDR sensing system can be improved observably with the proposed high ER probe pulse generator. At the end of a 48.5km sensing fiber, the maximum uncertainty of temperature measurement has been reduced from 5.2℃ to 0.8℃ with 25m spatial resolution after we improved the extinction ratio of probe pulse from 35dB to 65dB.
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Yixin Zhang, Lan Xia, Xuelin Wu, Xuping Zhang, Guanghui Wang, "Performance enhancement for long distance BOTDR sensing system based on high extinction ratio probe pulse generator", Proc. SPIE 9270, Optoelectronic Devices and Integration V, 92700L (24 October 2014); doi: 10.1117/12.2071653; https://doi.org/10.1117/12.2071653
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