PPLN waveguide for quantum communication

PPLN Waveguide for Quantum Communication

We report on energy-time and time-bin entangled photon-pair sources based on a periodically poled lithium niobate (PPLN) waveguide. Degenerate twin photons at 1314 nm wavelength are created by spontaneous parametric down-conversion and coupled into standard telecom fibers. Our PPLN waveguide features a very high conversion efficiency of about 10−6, roughly 4 orders of magnitude more than that o...

All-optical broadcast and multicast technologies based on PPLN waveguide

Phase-mismatched localized fields in A-PPLN waveguide devices.

Highly phase-mismatched nonlinear interactions can generate spatially localized optical fields that can affect the performance of nonlinear optical devices. We present a theoretical description of the generation of such spatially localized optical fields by ultrafast pulses. The effects of temporal walk-off and pump depletion are discussed, along with methods for suppression of the localized fi...

320-to-10 Gbit/s all-optical demultiplexing using sum- frequency generation in PPLN waveguide

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Advanced RPE PPLN Waveguide Applications: Beyond SHG and Uniform QPM Gratings

Apodization of linearly chirped QPM gratings in periodically-poled lithium niobate For second harmonic generation (SHG), it has been shown that the transfer function of a quasi-phasematched (QPM) device is directly related to the Fourier transform of its grating function [1]. For a uniform grating of finite length, this results in a sinc2 response of the SH signal as a function of fundamental w...