Laser & Optoelectronics Progress, Volume. 58, Issue 1, 106003(2021)
Pre-Pump Brillouin Optical Time Domain Analysis System Based on Double-Sideband Interference
In order to reduce the fitting error caused by the broadening of the spectrum, this paper proposes to use the double-sideband continuous light as the detection signal and use its interference spectrum for sensing. Compared with the traditional Brillouin gain spectrum, the obtained spectrum has a narrower linewidth near the resonance spectrum, the error of the double-peak fitting in the pre-pump temperature sensor is reduced, and the frequency resolution of the system is improved, so as to achieve high spatial resolution and high frequency resolution of a pre-pump Brillouin optical time domain analysis (BOTDA) system based on double-sideband interference. Experimental results show that 50 cm spatial resolution and 0.37 MHz frequency resolution can be achieved on 100 m polarization maintaining fiber by using this method. Compared with the traditional single side band pre-pump system, the frequency resolution of the system is increased by 2 times under the same spatial resolution.
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Qin Li, Wang Lanlan, Liang Hao, Cheng Linghao. Pre-Pump Brillouin Optical Time Domain Analysis System Based on Double-Sideband Interference[J]. Laser & Optoelectronics Progress, 2021, 58(1): 106003
Category: Fiber Optics and Optical Communications
Received: May. 6, 2020
Accepted: --
Published Online: Jan. 28, 2021
The Author Email: Hao Liang (tlianghao@jnu.edu.cn)