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We report a simple scheme to generate time-bin entangled photon pairs based on cascaded second-order nonlinear processes in a single periodically-poled lithium niobate waveguide. We successfully observed two-photon interference fringes up to 97% visibilities.
We propose a novel structure for two monolithically integrated PPLN waveguides with a reflective wavelength-division multiplexer consisting of two MMIs and a dichroic mirror. Frequency conversion through two-stage SHG/DFG processes is demonstrated using the integrated device.
We review the capabilities of phase sensitive amplifiers based on periodically poled LiNbO<sub>3</sub> (PPLN) waveguides for optical communication. Specifically, we discuss their unique low noise amplification, phase and amplitude regeneration in multi-span transmissions, and multilevel phase coding signal amplification.
This article describes a gas monitoring system for detecting nitrous oxide (N2O) gas using a compact mid-infrared laser source based on difference-frequency generation in a quasi-phase-matched LiNbO3 waveguide. We obtained a stable output power of 0.62 mW from a 4.6-μm-band continuous-wave laser source operating at room temperature. This laser source(More)
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