Coherent OTDR Using Flexible All-Digital Orthogonal Phase Code Pulse for Distributed Sensing

A coherent optical time-domain reflectometer (COTDR) using flexible all-digital orthogonal phase code pulse is proposed for distributed acoustic sensing. All-digital orthogonal phase code pulse with frequency shift and time shift is used as probe. Coherent detection and balance photodetector are use...

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Bibliographic Details
Published in:IEEE access 2020, Vol.8, p.85395-85400
Main Authors: Chen, Wenjie, Jiang, Junfeng, Liu, Kun, Wang, Shuang, Ma, Zhe, Ding, Zhenyang, Xu, Tianhua, Liu, Tiegen
Format: Article
Language:English
Subjects:
Coherence
coherent OTDR
distributed sensing
Frequency shift
interference
Modulation
Optical fiber sensors
Optical fibers
optical pulses
phase detection
phase extraction
Reflectometers
Waveforms
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Summary:A coherent optical time-domain reflectometer (COTDR) using flexible all-digital orthogonal phase code pulse is proposed for distributed acoustic sensing. All-digital orthogonal phase code pulse with frequency shift and time shift is used as probe. Coherent detection and balance photodetector are used to amplify interference signal and get rid of its direct-current (DC) component. The new scheme needs only single channel detection while keeping sampling frequency. Amplitude triangle modulation and frequency linear sweep modulation waveform are used for system performance investigation. The experiments on 15.4 km optical fiber showed that waveform information can be recovered well. The all-digital orthogonal phase code pulse will provide a flexible solution for different application requirement.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2992077