Electronic engineering

Engineering

Frequency domain

Telecommunications

Physics

Phase modulation

Channel (broadcasting)

Frequency modulation

Optics

Fiber optic sensor

Acoustics

Interference (communication)

Quantum mechanics

Amplitude modulation

Reflectometry

Computer science

Time domain

Modulation (music)

Fiber optic splitter

Optical time-domain reflectometer

Phase (matter)

Fading

Bandwidth (computing)

Phase noise

Optical fiber

Computer vision

Journal of Lightwave Technology

An approach of phase-shift transform is proposed and demonstrated to suppress the interference fading in phase sensitive optical time domain reflectometry (Φ-OTDR). The phase-shift transform is executed in the digital domain and the complicated frequency modulation is not required. The operation principle is carefully analyzed and a signal with complementary amplitude can be obtained with this method. Through synthesizing the complementary signals, the false phases can be corrected. Benefiting from the flexibility of this approach, multiple transforms are implemented to make sure that all phases are retrieved accurately. Experimental results show that the intensity fluctuation over 60 dB is reduced to 15 dB, which decreases the standard deviation of differential phase to 0.0224. Besides, 30 dynamic measurements are tested and all distorted phases have been corrected, indicating the high reliability of this method.

Suppression of the Interference Fading in Phase-Sensitive OTDR With Phase-Shift Transform