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A compact polarization splitter and rotator based on silicon photonic wire waveguide have been developed. The splitter is based on simple directional couplers. In the fabricated splitter, the polarization extinction ratio is 23 dB and excess loss is less than 0.5 dB. The rotator consists of a silicon waveguide and an off-axis silicon oxinitride waveguide. In the fabricated rotator, efficient polarization...
A novel resonator based on embedded rings may find important applications as novel ultra-small filter, modulator and delay element. It exhibits 10 times higher delay and potential for high-speed modulation.
Compact elliptic optical filter architectures based on arrays of parallel-cascaded microring doublets are proposed. These devices can realize general filter transfer functions with imaginary transmission zeros using only synchronously-tuned microrings with non-negative couplings.
We present the first experimental demonstration of recently proposed loop-coupled resonator device concepts, with characteristic transmission zeros, enabling optimally sharp passbands for channel add-drop filter applications. Fourth-order SiN-core and Si-core strong-confinement microring-resonator designs are described.
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