Highly efficient single-photon detection at communication wavelengths by use of upconversion in reverse-proton-exchanged periodically poled LiNbO3 waveguides.
Conventional single-photon detectors at communication wavelengths suffer from low quantum efficiencies and large dark counts. We present a single-photon detection system, operating at communication wavelengths, based on guided-wave frequency upconversion in a nonlinear crystal with an overall system detection efficiency (upconversion + detection) exceeding 46% at 1.56 microm. This system consists of a fiber-pigtailed reverse-proton-exchanged periodically poled LiNbO3 waveguide device in conjunction with a silicon-based single-photon counting module.
Langrock
Carsten
C
Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4085, USA. langrock@stanford.edu
Diamanti
Eleni
E
Roussev
Rostislav V
RV
Yamamoto
Yoshihisa
Y
Fejer
M M
MM
Takesue
Hiroki
H