We demonstrate an approach to measure average temperature changes in deployed optical fiber networks using Optical Time Domain Reflectometry , OTDR, at the single photon level. In this article we derive a model relating the change in temperature of an optical fiber to the change in time of flight of reflected photons in the fiber in the range −50 → 400 °C. A setup is constructed to validate this model utilizing a pulsed 1550 nm laser and a Superconducing Nanowire Single Photon Detector , SNSPD. With this setup we show that we can measure temperature changes with 0.08 °C accuracy over km distances and we demonstrate temperature measurements in a dark optical fiber network deployed across the Stockholm metropolitan area. This approach will enable in-situ characterization for both quantum and classical optical fiber networks.
CITATION STYLE
Staffas, T., Troive, F., & Zwiller, V. (2023). Temperature measurements in deployed optical fiber networks using single photon optical time domain reflectometry. Optics Express, 31(5), 8170. https://doi.org/10.1364/oe.483404
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