CPC G01S 17/34 (2020.01) [G01S 17/26 (2020.01); G01S 17/36 (2013.01)] | 18 Claims |
1. A line monitoring system, comprising:
a laser source to launch a plurality of pulsed probe signals;
an optical transmission system, comprising a plurality of loopbacks, disposed to receive the plurality of pulsed probe signals, and direct the plurality of pulsed probe signals through the plurality of loopbacks;
a polarization rotator, disposed between the laser source and the optical transmission system, to rotate a polarization of the plurality of pulsed probe signals,
a receiver to receive a plurality of return signals, derived from the plurality of pulsed probe signals from the optical transmission system; and
a perturbance detection system, coupled to the receiver, and arranged to:
measure a phase difference between a polarization of a pair of return signals of the plurality of return signals, the pair of return signals being received from a pair of loopbacks of the plurality of loopbacks; and
determine a location of a perturbance, based upon the phase difference,
wherein the plurality of return signals are each characterized by a phase of a polarization rotation returned by a given loopback, and
wherein the perturbance location system is arranged to determine the location by:
measuring a change in a value of the phase difference, wherein the phase difference is associated with a polarization returned by adjacent loopbacks of the pair of loopbacks.
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