PT Unknown AU Minaeva, O Fraine, A Korneev, A Divochiy, A Goltsman, G Sergienko, A TI High resolution optical time-domain reflectometry using superconducting single-photon detectors SE Frontiers in Opt. 2012/Laser Sci. XXVIII PY 2012 BP Fw3a.39 DI 10.1364/Fio.2012.Fw3a.39 DE SSPD; SNSPD; Photodetectors; Fiber characterization; Light beams; Optical time domain reflectometry; Photon counting; Single mode fibers; Single photon detectors; Superconductors AB We discuss the advantages and limitations of single-photon optical time-domain reflectometry with superconducting single-photon detectors. The higher two-point resolution can be achieved due to superior timing performance of SSPDs in comparison with InGaAs APDs. ER