We demonstrate an integrated Bragg grating filter using 60-nm-thick silicon-on-insulator strip waveguides. The ultrathin waveguides exhibit a propagation loss of 0.61 dB/cm. Upon thinning-down, the waveguide effective refractive index is reduced, making the fabrication of Bragg grating filter possible using the standard 248-nm deep ultra-violet (DUV) photolithography process. The Bragg grating filter exhibits a stopband width of 1 nm and an extinction ratio of 31 dB.
We present our recent work on integrated silicon photonic devices for optical filter and delay applications. A microdisk
resonator integrated with interleaved p-n junctions is demonstrated. The resonance can be both blue- and red-shifted by applying a forward current or a negative voltage, respectively. A MZI-nested microring resonator is shown capable of
coupling tuning, enabled by a p-i-p junction based thermal heater across the waveguide. We also investigate cascaded
self-coupled optical waveguide (SCOW) resonators. Electromagnetically-induced transparency (EIT)-like resonances are
generated featuring a narrow lineshape and a high group delay. Finally, we present an athermal lattice filter made up of 10 cascaded Mach-Zehnder interferometer (MZI) units and show that the temperature sensitivity can be considerably