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IEICE Technical Report; IEICE Tech. Rep.

Waveguide quasi-phase-matching sum-frequency generation devices for single photon detection in communication band

M. Fujimura, Kazufumi Beniya, Suhara Toshiaki

Published Jan 21, 2008• 0 citations
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An efficient single-photon detector for the communication wavelength band is required for quantum communication. A detection method utilizing a highly efficient photon wavelength converter and a Si avalanche photodiode is promising. In this work, we studied waveguide quasi-phase-matched sum-frequency generation devices for a photon wavelength converter. We adopted an InGaAs laser diode as a pump source for the implementation of a practical detection module. The device performance was theoretically examined. A prototype device was designed, fabricated, and tested. A maximum quantum efficiency of 23% was obtained in wavelength conversion experiments. A high potential of the device for a single-photon detector was demonstrated.
Polarization independent sum frequency generation (SFG) is proposed in an electro-optic (EO) tunable periodically poled Lithium Niobate (PPLN). The PPLN consists of four sections. External electric field could be selectively applied to them to induce polarization rotation between the ordinary and extraordinary waves. If the domain structure is well designed, the signal wave with an arbitrary polarization state could realize efficient frequency up-conversion as long as a z-polarized pump wave is selected. The applications in single photon detection and optical communications are discussed.