High Performance Silicon Photonics Filters for Quantum Applications

Integrated optical filters are key building blocks in many applications including quantum optics, microwave photonics and telecommunications. Bragg grating structures stand out as a prominent solution for filtering in silicon chips because of their virtually infinite free-spectral range, high rejection ratios and narrow bandwidths. In this presentation we summarize two of our recent contributions in integrated Bragg filters including: i) a contra-directional coupler for quantum applications with a 40 dB rejection of the pump wavelength for both polarizations, and ii) a thermally tunable notch filter with controllable sidelobes. Both devices introduce new design approaches for optical systems demanding high performance spectral filtering.