A Simple method for enhancing the SNR in direct detection φ-OTDR based distributed acoustic sensors
2020 Conference on Lasers and Electro-Optics Pacific Rim, CLEO-PR 2020 - Proceedings20
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A simple and effective method for increasing the SNR and range in φ-OTDR based direct-detection distributed acoustic sensors is proposed and experimentally verified. The proposed method results in ~11 dB SNR improvement at 66 km.