Quadratic phase coding for SNR improvement in time-expanded phase-sensitive OTDR

Time-expanded phase-sensitive optical time-domain reflectometry ( T E − Φ O T D R ) is a dual-comb-based distributed optical fiber sensing technique capable of providing centimeter scale resolution while maintaining a remarkably low (MHz) detection bandwidth. Random spectral phase coding of the dual...

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Bibliographic Details
Published in:Optics letters 2021-09, Vol.46 (17), p.4406-4409
Main Authors: Soriano-Amat, Miguel, Martins, Hugo F., Durán, Vicente, Martin-Lopez, Sonia, Gonzalez-Herraez, Miguel, Fernández-Ruiz, María R.
Format: Article
Language:English
Subjects:
Coding
Interrogation
Optical fibers
Signal processing
Signal to noise ratio
Spectra
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Summary:Time-expanded phase-sensitive optical time-domain reflectometry ( T E − Φ O T D R ) is a dual-comb-based distributed optical fiber sensing technique capable of providing centimeter scale resolution while maintaining a remarkably low (MHz) detection bandwidth. Random spectral phase coding of the dual combs involved in the fiber interrogation process has been proposed as a means of increasing the signal-to-noise ratio (SNR) of the sensor. In this Letter, we present a specific spectral phase coding methodology capable of further enlarging the SNR of T E − Φ O T D R . This approach is based on the use of a quadratic spectral phase to precisely control the peak power of the comb signals. As a result, an SNR improvement of up to 8 dB has been experimentally attained with respect to that based on the random phase coding previously reported.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.432350