Reconfigurable silicon filter with continuous bandwidth tunability

Orlandi, Piero and Ferrari, Carlo and Strain, Michael and Canciamilla, Antonio and Morichetti, Francesco and Sorel, Marc and Bassi, Paolo and Melloni, Andrea (2012) Reconfigurable silicon filter with continuous bandwidth tunability. Optics Letters, 37 (17). pp. 3669-3671. (

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We present the design and the fabrication of compact tunable silicon-on-insulator bandpass filters based on the integration of a Mach–Zehnder interferometer with ring resonators and activated via thermo-optic phase shifters. The proposed architecture provides wide filter bandwidth tunability from 10% to 90% of the free spectral range preserving the filter off-band rejection. Possible applications are channel subset selection in wavelength division multiplexing optical systems, adaptive filtering to signal bandwidth, and reconfigurable filters for gridless networking.