Interference Fading Suppression Solution for Phase-sensitive OTDR with Sub Signal Phase Reconstruction

An interference fading suppression scheme based on phase-sensitive optical time-domain reflectometry ($\Phi$-OTDR) system is proposed. This scheme is based on the energy distribution of sub signals for phase selection. The experimental results show that this scheme has a good effect in suppressing interference fading. The signal-to-noise ratio (SNR) of the demodulated vibration signal exceeds 35dB. Since this method only processes data in the digital domain without changing the system structure, it does not increase system costs.