Suppression of fading in Ф-OTDR systems based on phase-modulated optical frequency combs

Ye Cai; Zhenjin Cen; Tailong Lv; Yining Zhang; Xiaowei Huang; Yuyang Zhang; Chi Cai; Yanyang Lei; Xiaohui Tang

doi:10.1117/12.3020769

30 April 2024 Suppression of fading in Φ-OTDR systems based on phase-modulated optical frequency combs

Ye Cai, Zhenjin Cen, Tailong Lv, Yining Zhang, Xiaowei Huang, Yuyang Zhang, Chi Cai, Yanyang Lei, Xiaohui Tang

Proceedings Volume 13154, Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Detector Technologies; 131540R (2024) https://doi.org/10.1117/12.3020769
Event: Sixth Conference on Frontiers in Optical Imaging Technology and Applications (FOI2023), 2023, Nanjing, JS, China

Abstract

A new method of suppressing the fading effect of phase-sensitive optical domain-of-view reflectometer (Φ-OTDR) by using a phase-modulated frequency comb is presented in this paper. The distribution of fading points is different, so frequency division multiplexing (FDM) radiation can be used to suppress the fading effect. In the experimental system of this paper, firstly, frequency comb continuous light is generated by phase modulation; Then, different Rayleigh backscattering (RBS) intensity distributions are generated by pulse detection light modulating and injecting into the sensing fiber. Finally, the intensity distribution of RBS is extracted by amplitude estimation method. The phase is processed to eliminate the missing truth. The fading suppression is realized by our system, and the suppression effect is evaluated. By using a constant amplitude optical frequency comb with seven frequency components, the fading probability of the system is drastically reduced from 5.49%-9.83% to 0.08%. The method proposed in this paper has larger modulation bandwidth and more flexible frequency combination scheme, which can better suppress the fading effect. This method does not sacrifice the response bandwidth of the system, and can accurately control the phase delay, so it is very helpful to fully suppress the fading effect.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ye Cai, Zhenjin Cen, Tailong Lv, Yining Zhang, Xiaowei Huang, Yuyang Zhang, Chi Cai, Yanyang Lei, and Xiaohui Tang "Suppression of fading in Φ-OTDR systems based on phase-modulated optical frequency combs", Proc. SPIE 13154, Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Detector Technologies, 131540R (30 April 2024); https://doi.org/10.1117/12.3020769

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KEYWORDS

Frequency combs

Phase modulation

Phase shift keying

Modulation frequency

Frequency modulation

Signal detection

Vibration

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