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Coherent OTDR using Flexible ALL-Digital Orthogonal Phase Code Pulse for Distributed Sensing
2020
IEEE Access
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
doi:10.1109/access.2020.2992077
fatcat:mgfekhkkdbhmdit32twnn2dsxi