217 km long distance photon-counting optical time-domain reflectometry based on ultra-low noise up-conversion single photon detector

Date: 2013-10-09
Authors Guo-Liang Shentu, Qi-Chao Sun, Xiao Jiang, Xiao-Dong Wang, Jason S. Pelc, M. M. Fejer, Qiang Zhang, and Jian-Wei Pan
Journal No. Optics Express, 21, 24674 (2013)
Abstract 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 achieve a noise equivalent power of −139.7 dBm/ Hz−−√ for our detector. We perform the OTDR experiments using a fiber of length approximate 217 km, and show that our system can identify defects along the entire fiber length in a measurement time of 13 minutes.