Abstract
The influence of the laser frequency drift on the operation of phase-sensitive optical time domain reflectometry (φ-OTDR) systems is considered. Theoretical results based on a new numerical φ-OTDR model demonstrating the influence of the laser frequency instability on a signal are reported. This model is verified based on experimental data. It has been used to calculate the signal-to-noise ratio (SNR) of the system for different parameters of the laser source stability. As a result, quantitative requirements for lasers used in φ-OTDR systems are formulated.
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Funding
A theoretical and experimental study of the stability of a laser source was performed by A.A. Zhirnov and K.V. Stepanov and funded by the Russian Foundation for Basic Research, project no. 18-32-00688. A.K. Fedorov was funded by the Russian Foundation for Basic Research, project no. 18-37-20033.
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Zhirnov, A.A., Stepanov, K.V., Chernutsky, A.O. et al. Influence of the Laser Frequency Drift in Phase-Sensitive Optical Time Domain Reflectometry. Opt. Spectrosc. 127, 656–663 (2019). https://doi.org/10.1134/S0030400X1910031X
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DOI: https://doi.org/10.1134/S0030400X1910031X