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A coherent optical subassembly (COSA) is evaluated for coherent-correlationoptical time domain reflectometry (CC-OTDR) based fibre sensing. Even thoughthe COSA was originally designed for digital communication applications,acoustic signals with frequencies up to 360 Hz can be detected after 50 km oftransmission.

Acoustic Sensing after 50 km of Transmission Fibre using Coherent Optical Subassembly