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217 km long distance photon-counting optical time-domain reflectometry based on ultra-low noise up-conversion single photon detector
2013
Optics Express
We demonstrate a photon-counting optical time-domain reflectometry with 42.19 dB dynamic range using an ultra-low noise up-conversion single photon detector. By employing the long wave pump technique and a volume Bragg grating, we reduce the noise of our up-conversion single photon detector, and achieve a noise equivalent power of -139.7 dBm/sqrt(Hz). We perform the OTDR experiments using a fiber of length 216.95 km, and show that our system can identify defects along the entire fiber length
doi:10.1364/oe.21.024674
pmid:24150311
fatcat:cstlzsmhw5hjfhumksvvqtou4a