PPLNS

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We have developed an up-conversion technique based on PPLN waveguides to convert 1310 nm photon into 710 nm photons detectable by low-cost Si-APDs (10), (11).
This filter is important because the optical noise between 1000 nm and 1300 nm can induce a large amount of dark counts and the WDM before the Periodically-poled [LiNbO.sub.3] (PPLN) may not be sufficient to suppress this noise.
Transmittance of different components and overall detection efficiencies of the 1550 nm pump up-conversion detectors PPLN1 PPLN2 PC and WDM at 1310 nm 70% 74% Input coupling of PPLN at 1550 nm * 52% 71% Input coupling of PPLN at 1310 nm * 44% 59% Output coupling of PPLN at 710 nm * 92% 77% Filter before APD * 75% 88% APD efficiency at 710 nm * 70% 70% Overall efficiency 15% 20% *: These parameters are provided by the manufactures.