A quantum-noise limit for temperature-change estimation in coherent phase-OTDR is derived and numerically checked, with uncertainty scaling as the phase uncertainty divided by sensing length.
Noise analysis in direct detection and coherent detec- tion phase-sensitive optical time-domain reflectometry systems
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Quantum Noise Limited Temperature-Change Estimation for Phase-OTDR Employing Coherent Detection
A quantum-noise limit for temperature-change estimation in coherent phase-OTDR is derived and numerically checked, with uncertainty scaling as the phase uncertainty divided by sensing length.