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.
A noise figure below 3dB was obtained for the first time in a CW pumped PSA based on a PPLN waveguide. The 40Gbit/s-DPSK receiver sensitivity was improved by using the PSA as a preamplifier.
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 report carrier-envelope offset beat detection (52-dB signal-to-noise ratio at 100-kHz resolution bandwidth) with a common-path 2f-to-3f self-referencing interferometer with a dual-pitch periodically poled lithium niobate ridge waveguide.
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)
New waveguide technologies, namely direct bonding and dry etching, have improved damage resistance, transparent wavelength range, efficiency, and functionality. An engineered QPM structure enables variable wavelength conversion and reduces waveband crosstalk.