In-Field Demonstration of Multi-Tech Sensing on Terrestrial Optical Data Network using State Of Polarization and Phase Monitoring

We implement a multi-tecnnique seismic observatory on a live optical link in central Italy, using phase and state-of-polarization sensing coexisting with data traffic. Combining diverse fiber sensing and traditional tools enables turning telecom infrastructure into a resilient smart grid for interpreting complex and heterogeneous events. ©2025 The Author(s)