23 April 2017 Coherent-detection-assisted BOTDA system without averaging using single-sideband modulated local oscillator signal
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103237L (2017) https://doi.org/10.1117/12.2265293
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
A novel setup for coherent-detection-assisted Brillouin optical time domain analysis (BOTDA) is proposed and demonstrated. Performance enhancement is enabled by a power-controllable local oscillator (LO) generated using single-side-band (SSB) modulation. Through employing a commercial coherent receiver and polarization diversity scheme, the Brillouin gain traces carried on a stable intermediate frequency (IF) are obtained in real time without any averaging and processed by digital signal processing (DSP) without the need of ultra-narrow optical band pass filter. A spatial resolution of 4 m and frequency uncertainty of 1.473 MHz are achieved over 40 km sensing range using a single scan.
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Nan Guo, Liang Wang, Chao Jin, Tao Gui, Kangping Zhong, Xian Zhou, Jinhui Yuan, Changyuan Yu, Hwa-Yaw Tam, Chao Lu, "Coherent-detection-assisted BOTDA system without averaging using single-sideband modulated local oscillator signal", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103237L (23 April 2017); doi: 10.1117/12.2265293; https://doi.org/10.1117/12.2265293
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