Patent ID: 11914040
Assignee: SUBCOM, LLC
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A method of locating a perturbation using a transmission system, comprising:
launching a probe beam from a laser probe source, the probe beam comprising a plurality of pulsed probe signals, the launching of the probe beam comprising directing the probe beam to a polarization rotator, and rotating the probe beam at a predetermined frequency;
detecting, at a receiver, a plurality of return signals, derived from the plurality of pulsed probe signals, wherein the plurality of return signals are received from a plurality of loopbacks, disposed along the transmission system;
measuring 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
determining a location of a perturbance, external to the optical transmission system, based upon the phase difference.