title: 217 km long distance photon-counting optical time-domain reflectometry based on ultra-low noise up-conversion single photon detector.
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.
authors.forename: Guo-Liang
authors.initials: GL
authors.lastname: Shentu
authors.forename: Qi-Chao
authors.initials: QC
authors.lastname: Sun
authors.forename: Xiao
authors.initials: X
authors.lastname: Jiang
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Wang
authors.forename: Jason S
authors.initials: JS
authors.lastname: Pelc
authors.forename: M M
authors.initials: MM
authors.lastname: Fejer
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.forename: Jian-Wei
authors.initials: JW
authors.lastname: Pan