Polarization Sensing refers to the measurement or detection of the polarization state of light. In optics, light waves have an orientation of electric and magnetic fields, and polarization sensing is used to analyze and exploit these properties. Polarization sensors are employed in various applications, including remote sensing, imaging, and communications.


Improvement of Resilience of Submarine Networks Based on Fiber Sensing

Simultaneous phase and polarization sensing with span length resolution using the supervisory path is demonstrated. It is shown that by measuring polarization rotation matrix of the return paths, instead of monitoring only the state of polarization, location of the polarization disturbance can be determined even for large polarization rotations. By using the polarization rotation matrices, the phase and polarization disturbances are successfully decoupled. How the existing supervisory system and sensing can coexist in new SDM cables that utilizes pump sharing is discussed.

Polarization Sensing Using Polarization Rotation Matrix Eigenvalue Method

Polarization-based, multi-span sensing over a link with reflection-back circuits is demonstrated experimentally. By measuring rotation matrices instead of just monitoring polarization, a 35 dB extinction in localization is achieved regardless of the disturbance magnitude.