Overview on Optical Sensing Techniques Over Deployed Telecom Networks

We review in this paper the latest advancements in optical sensing techniques specifically designed for deployment over existing telco fiber networks. Specifically, we focus on sensing techniques that enable coexistence with telecom traffic in Wavelength Division Multiplexing (WDM) optical systems, while allowing fast processing suitable for real time warning/alarm generation using the telemetry systems of modern optical fiber networks. For the most promising solutions, we present physical layer simulations to explore and elaborate on the coexistence constraints, providing a detailed analysis of their feasibility and performance.