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Long range fading free phase-sensitive reflectometry based on multi-tone NLFM pulse

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Abstract

Characterized by non-amplification in sensing fiber and coherent fading free, an φ-OTDR vibration sensing system is experimentally validated with 80 km sensing range, 2.5 m spatial resolution, 49.6 dB dynamic range, and 45 dB phase demodulation SNR.

© 2018 The Author(s)

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