Undersea Sensing refers to techniques for detecting and measuring disturbances, such as phase and polarization changes, along undersea fiber-optic cables. This involves using the cable’s supervisory path, which usually monitors the cable’s health, to also sense changes in the optical signal’s phase and polarization. These disturbances can provide information about environmental factors, stress on the cable, or potential faults.

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Improvement of Resilience of Submarine Networks Based on Fiber Sensing

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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.

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