Recent Progresses in Silicon Waveguide Bragg Grating Filters

High-performance photonic integrated filters realized with distributed feedback resonator architectures in silicon-on-insulator waveguide technology can lead to narrow bandpass transfer functions with bandwidth in the order of 1 GHz, large out-of-band rejection of up to 50 dB, and extremely sharp roll-off of more than 20 dB per GHz. To improve the insertion loss feature of the filter, a low-loss long-cavity design approach has been implemented. Additionally, a single wide passband filter architecture based on an apodized Bragg grating design and its use for emulating free-spectral-range-free filtering operation is proposed and experimentally verified.