Laser & Optoelectronics Progress, Volume. 56, Issue 17, 170624(2019)
Influence of Laser Frequency Stability on Distributed Brillouin Sensing System
Herein, we design and implement a laser frequency stability measurement system based on coherent detection and Rayleigh scattering to measure the instantaneous small frequency deviation of the laser. Based on the proposed system, the study examines performance degradation due to laser frequency fluctuation in distributed Brillouin sensors. Results show that large frequency fluctuation of the laser can result in the broadening of the Brillouin gain spectrum and deviation from the Lorentz shape. This produces a large error in the measurement of Brillouin frequency and limits the sensing range to 15 km for the laser studied. The sensing range can be extended to 50 km by a laser with good frequency stability.
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Jinding Zhu, Linghao Chen, Liming Zhou, Weimin Liu. Influence of Laser Frequency Stability on Distributed Brillouin Sensing System[J]. Laser & Optoelectronics Progress, 2019, 56(17): 170624
Category: Fiber Optics and Optical Communications
Received: Feb. 27, 2019
Accepted: Apr. 9, 2019
Published Online: Sep. 5, 2019
The Author Email: Chen Linghao (chenglh@ieee.org)