For optical parametric amplifiers in proton-exchange waveguide devices reported to date, both the signal and the idler photons are in the mode, causing difficulty in distinguishing signal from idler. We report a two-mode optical parametric amplifier. The key components, asymmetric Y junctions, successfully launch the pump wave in a pure mode and separate the signal and the idler in the and modes with a power ratio of as much as 27.5 dB. With high parametric gain, optical parametric generation with a threshold of was demonstrated for 1.8 ps long pump pulses near 780 nm. These periodically poled lithium niobate waveguides are efficient integrable photon sources.
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