Photon-counting optical time domain reflectometry(v-OTDR)is typically used in a mode with spatial resolution in the centimeter range.Here we demonstrate a 1550 nm v-OTDR system to optimize the discriminate voltage of a single photon avalanche detector using a single photon modulation and demodulation technique,which shows obvious improvement in the signal intensity.The intensity of signal is doubled when the discriminator voltage is optimized from 184 mV to 162 mV.
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机译：Vacuum Ultraviolet Lamp Based magnetic Field Enhanced photoelectron Ionization and single photon Ionization source for Online Time-of-Flight mass spectrometry
