100 dB/cm broadband optical parametric amplification in dispersion engineered nanophotonic lithium niobate waveguides

We demonstrate phase-sensitive amplification and confirm a gain exceeding 100 dB/cm on a dispersion-engineered thin-film lithium niobate waveguide, using less than 20 pJ of pump energy, and exhibiting a gain bandwidth larger than 600 nm around 2.09 µm.