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Conference Paper
Asia Communications and Photonics Conference and Exhibition
Shanghai China
November 13-16, 2011
ISBN: 978-0-8194-8959-3
Sensors II (SENSII)

Phase-sensitive OTDR system based on digital coherent detection

Zhengqing Pan, Kezhen Liang, Qing Ye, Haiwen Cai, Ronghui Qu, and Zujie Fang


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The digital coherent detection method is employed into the φ-OTDR. The heterodyne detection offers very high optical gain while the digital signal processing serves as an effective tool to rebuild the instantaneous electric field of Rayleigh scattering light by analyzing the beating signal. Both amplitude and phase signal are obtained in our experiment. PZT vibration measurement verifies that the phase difference signal well represents the external perturbation signal and also with higher SNR. The proposed newφ-OTDR system shows a good application foreground in the area of distributed vibration measurement.

© 2011 SPIE

Z. Pan, K. Liang, Q. Ye, H. Cai, R. Qu, and Z. Fang, "Phase-sensitive OTDR system based on digital coherent detection," in Optical Sensors and Biophotonics, J. Popp, D. Matthews, J. Tian, and C. Yang, eds., Vol. 8311 of Proceedings of SPIE (Optical Society of America, 2011), paper 83110S.

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