A phase-sensitive optical time-domain reflectometry system with an electrical I/Q demodulator

Guojie Tu; Benli Yu; Mengmeng Zhao; Jiping Lin

doi:10.1117/12.2502689

23 October 2018 A phase-sensitive optical time-domain reflectometry system with an electrical I/Q demodulator

Guojie Tu, Benli Yu, Mengmeng Zhao, Jiping Lin

Proceedings Volume 10821, Advanced Sensor Systems and Applications VIII; 1082123 (2018) https://doi.org/10.1117/12.2502689
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

We propose an electrical I/Q demodulation scheme to decrease the sampling rate and computational cost in coherent phase-sensitive Optical Time-Domain Reflectometry systems. The IF signal from the photon detector and the local-oscillator from the acoustic-optic modulator driver are splited into two parts, respectively. One of local-oscillators is 90°shifted, then the signals and LOs are cross-mixed and the outputs are low-pass filtered to obtain the I/Q signal. Besides of the save of computational cost, the sampling rate and data storage is reduced at least 1.6 times. At last, a quantitative measurement of a 50 Hz vibration is successfully demonstrated in the experiment.

Citation Download Citation

Guojie Tu, Benli Yu, Mengmeng Zhao, and Jiping Lin "A phase-sensitive optical time-domain reflectometry system with an electrical I/Q demodulator", Proc. SPIE 10821, Advanced Sensor Systems and Applications VIII, 1082123 (23 October 2018); https://doi.org/10.1117/12.2502689

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