Impulse Response Measurement of a Few-Mode Fiber Using Superconducting Nanowire Single-Photon Detectors

Abstract

We use time-of-flight measurements of single photons to estimate the impulse response of a 96 km long few-mode fiber and obtain unparalleled sensitivity of -100 dBm with a 40 dB dynamic range using the high timing accuracy of superconducting nanowire single-photon detectors.