φ-OTDR Sensing System with Bidirectional Pumped Fiber Raman Amplifier and Unbalanced MZ Interferometer

Liang Zhang; Ming Tian; Lei Dong

doi:10.1117/12.2285606

25 October 2017 φ-OTDR sensing system with bidirectional pumped fiber Raman amplifier and unbalanced MZ interferometer

Liang Zhang, Ming Tian, Lei Dong

Proceedings Volume 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications; 104642H (2017) https://doi.org/10.1117/12.2285606
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China

Abstract

In order to improve the detection distance and the sensitivity, we propose a novel distributed optical fiber sensing system. This system is composed of bidirectional pumping fiber Raman amplifier and unbalanced fiber Mach-Zehnder interferometer. Based on the interference mechanism of phase sensitive optical time domain reflectometer (φ-OTDR), the system can get the sensing information of the whole optical fiber by analyzing the backward scattered light. The interferometer is used as the demodulator of the sensing system, which consists of a 3×3 coupler and two faraday rotator mirrors. By means of the demodulator, the signal light is divided into three beams with fixed phase difference. To deal with these three signals, we can get the vibration information directly on the optical fiber. Through experimental study, this system has a high sensitivity. The maximum sensing length and the spatial resolution of the φ-OTDR system are 100 km and 10 m. The signal to noise ratio about 18 dB is achieved.

Citation Download Citation

Liang Zhang, Ming Tian, and Lei Dong "φ-OTDR sensing system with bidirectional pumped fiber Raman amplifier and unbalanced MZ interferometer", Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 104642H (25 October 2017); https://doi.org/10.1117/12.2285606

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