Signal processing method in phase otdr

Abstract

According to present disclosure, there is provided a signal processing device as a phase OTDR that performs processing of averaging scattered light vector signals pertaining to a plurality of optical frequencies different from each other, by an optical frequency multiplexing technique, the signal processing device including: a functional unit that calculates a correction value for a phase offset between different optical frequencies per measurement data within a range of a time window having a predetermined window length; and a functional unit that executes correction for the phase offset the between different optical frequencies by performing processing of averaging measurement data, belonging to a middle of the time window and a timing later than the middle, by using the correction value with the time window kept moving in a time direction.

Dependencies are inferred from the claim text.