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We demonstrate upconversion single-photon detection for the 1550-nm bandusing a PPLN waveguide, long-wavelength pump, and narrowband filtering using avolume Bragg grating. We achieve total-system detection efficiency of around30% with noise at the dark-count level of a silicon APD. Based on the newdetector, a single-pixel up-conversion infrared spectrometer with a noiseequivalent power of -142 dBm was demonstrated, which was better than liquidnitrogen cooled InGaAs arrary.

Ultralow noise up-conversion detector and spectrometer at telecom band