光电子快报(英文版), 2018, 14 (5): 325, Published Online: Apr. 16, 2019   

Performance improvement of a self-heterodyne detection BOTDR system employing broad-band laser

Author Affiliations
1 Institute of Information Technology, Hebei University of Economics and Business, Shijiazhuang 050061, China
2 Department of Electronic and Communication Engineering, North China Electric Power University, Baoding 071003, China
Abstract
The self-heterodyne detection Brillouin optical time domain reflectometer (BOTDR) system using broad-band laser is proposed to reduce coherent Rayleigh noise and improve the system performance. Compared with the system with narrow-band laser, the stimulated Brillouin scattering (SBS) threshold can be improved by about 3 dB. The experi-mental results of the narrow-band laser measurements for three times independently and the broad-band laser meas-urement for one time are compared. The root-mean-square (RMS) errors of Brillouin linewidth for two systems with narrow-band laser and broad-band laser are 6.9 MHz and 2.7 MHz, respectively, and the RMS errors of temperature for the heated fiber are about 1.3 °C and 0.7 °C. With the broad-band laser, signal-to-noise ratio (SNR) of the un-heated fiber is approximately equivalent to that of the integrated three independent Brillouin signals for the narrow-band laser, and the results are believed to be beneficial for performance improvement and measurement time reduc-tion.

LI Xiao-juan, LI Yong-qian, ZENG Wen-xian, FAN Han-bai, ZHANG Li-xin. Performance improvement of a self-heterodyne detection BOTDR system employing broad-band laser[J]. 光电子快报(英文版), 2018, 14(5): 325.

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