An Ultra-broadband Gallium Phosphide Optical Parametric Amplifier

Optical parametric amplification [1], which utilizes material nonlinearities, has long been considered one approach to increase channel capacity, but the technical complexity of systems using highly nonlinear fibers or bulk waveguides restricts their practical usage. Silicon nitride photonic integrated circuits offer tighter confinement and higher Kerr nonlinearity, but their gain and bandwidth are still limited [2, 3].