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.
© 2012 Optical Society of America
Original Manuscript: June 5, 2012
Revised Manuscript: July 23, 2012
Manuscript Accepted: July 23, 2012
Published: August 29, 2012
Piero Orlandi, Carlo Ferrari, Michael John Strain, Antonio Canciamilla, Francesco Morichetti, Marc Sorel, Paolo Bassi, and Andrea Melloni, "Reconfigurable silicon filter with continuous bandwidth tunability," Opt. Lett. 37, 3669-3671 (2012)