LONG RANGE DISTRIBUTED FIBER SENSING WITH IMPROVED NOISE PERFORMANCE
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United States of America
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Issued Date -
Feb 6, 2025
app pub date -
May 31, 2024
filing date -
May 31, 2024
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Abstract
A method and apparatus of OFDR are disclosed, in which a pair of probe signals are launched, on mutually orthogonal channels, into the optical fiber cable that is to be monitored. In a digital processing circuit, phase noise is cancelled from the return signals after detecting them in their respective mutually orthogonal channels and after demodulating them, by combining them such that noise components of the respective demodulated signals are mutually cancelled. In embodiments, a conjugate pair of probe signals are launched, on mutually orthogonal channels, into the optical fiber cable.
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