Performance improvement of phase-optical time domain reflectometry (Φ-OTDR) based on wavelength diversity technique

Nageswara Lalam; Ping Lu; Michael Buric

doi:10.1117/12.2588362

12 April 2021 Performance improvement of phase-optical time domain reflectometry (Φ-OTDR) based on wavelength diversity technique

Nageswara Lalam, Ping Lu, Michael Buric

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Proceedings Volume 11739, Fiber Optic Sensors and Applications XVII; 117390C (2021) https://doi.org/10.1117/12.2588362
Event: SPIE Defense + Commercial Sensing, 2021, Online Only

Abstract

In this paper, we demonstrate a fading noise reduction in the phase-optical time domain reflectometry (Φ-OTDR) based on a wavelength diversity technique. In the proposed wavelength diversity technique, multiple wavelengths are injected into the sensing fiber, while the wavelength selective time delay is induced to avoid the temporal overlapping. The proofof- concept experimentally demonstrated with three pump wavelengths in the proposed system using a 2 km sensing fiber with 1 m spatial resolution. In the proposed wavelength diversity Φ-OTDR system, the amplitude standard deviations are significantly minimized, thus reduced fading errors. At the end of the 2 km, the vibration frequencies from 100 Hz to 10 kHz are demonstrated. In addition, a simple, low-cost self-mixing demodulation technique has been employed in a proposed wavelength diversity Φ-OTDR system to eliminate the frequency offset between the electrical local oscillator and the beat signal. The proposed fading noise-free system will be attractive for practical applications such as oil and gas pipeline monitoring.

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Nageswara Lalam, Ping Lu, and Michael Buric "Performance improvement of phase-optical time domain reflectometry (Φ-OTDR) based on wavelength diversity technique", Proc. SPIE 11739, Fiber Optic Sensors and Applications XVII, 117390C (12 April 2021); https://doi.org/10.1117/12.2588362

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KEYWORDS

Reflectometry

Signal to noise ratio

Sensing systems

Interference (communication)

Demodulation

Denoising

Earthquakes

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