Silicon nitride (SiN) have become an essential material for integrated photonics. It is needed whenever very low optical losses, high optical power, low thermal sensitivity or broad wavelength range is required. SiN waveguides therefore present a great interest for applications as diverse as quantum photonics, data-communication, neuromorphic computing, LiDAR, sensing and microwave optic. We present our latest results on two distinct platforms: An 8” LPCVD SiN platform featuring ultra-low loss (5dB/m) and a 12” Physical Vapor Deposition (PVD) SiN platform allowing low loss in the C-band with a low-temperature deposition.
We experimentally demonstrate the feasibility of the use of integrated linearly uncoupled resonators, which are coupled solely through the nonlinear interaction, to selectively enhance or suppress nonlinear processes. This is exploited to selectively enhance dual-pump spontaneous four-wave mixing while suppressing the parasitic noise associated with single pump spontaneous four-wave mixing processes. A signal-to-noise ratio characterizing the generation of identical photon pairs of more than four orders of magnitude is reported, opening the way to a new class of integrated devices exploiting the unique properties of identical photon pairs in the same optical mode.
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