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physics.optics2026
Fully Distributed Fiber-Optic Sensing Enabled by Kalman Filtering
Juan M. Marin, Roman Ermakov, Florian Azendorf +3
Signal fading creates points along the fiber where phase cannot be extracted, so they are conventionally discarded. Instead, we propose a Kalman-based solution for ϕ-OTDR full-fibe…
physics.optics2026
Sensitivity Limits for -OTDR
Juan M. Marin, Roman Ermakov, Huwei Wang +2
We demonstrate a new lower bound on the sensitivity of -OTDR by estimating phase using Kalman filtering. Numerical analysis shows a 35-dB reduction in the minimum detectab…
physics.optics2026
Fundamentals of Optical Fiber Sensing Schemes Based on Coherent Optical Time Domain Reflectometry: Signal Under Dynamic Temperature Conditions
Roman Ermakov, Huwei Wang, Florian Azendorf +4
We present a theoretical, algorithmic, and experimental study of temperature sensing using -OTDR with coherent detection. A physics-based model is developed to relate the measur…