GHz-bandwidth Silicon Photonics Multichannel Filter for Super-Channel Transceiver

We propose and demonstrate a novel GHz-bandwidth multichannel optical filter (MOF) design using a resonator-assisted discrete-Fourier-transform interferometer topology. By employing ultra-low-loss silicon waveguides and low-phase-error phase-tuning elements, the present reconfigurable MOF is able to be implemented on silicon platform, which is challenge for realizing GHz-bandwidth filters due to the large waveguide propagation loss. In particular, the proposed MOF is capable of performing some specific filtering responses with e.g. near-rectangular shape as well as sinc shape. We successfully demonstrated the generation of WDM super-channel comprising four 10-Gaud subchannels using the designed MOF.