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Photonic integrated filter with widely tunable bandwidth

Orlandi, Piero and Morichetti, Francesco and Strain, Michael John and Sorel, Marc and Bassi, Paolo and Melloni, Andrea (2014) Photonic integrated filter with widely tunable bandwidth. Journal of Lightwave Technology, 32 (5). pp. 897-907. ISSN 0733-8724

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We present a comprehensive design, fabrication, and characterization analysis of compact silicon-on-insulator bandpass filters with widely tunable bandwidth. The filter architecture is based on an unbalanced Mach-Zehnder interferometer loaded with a pair of ring resonators. A wide bandwidth tunability (from 10% to 90% FSR) can be achieved by controlling the resonant frequency of the rings while preserving a good filter off-band rejection. Design rules are provided that take into account fabrication tolerances as well as losses. Furthermore, the use of tunable couplers allows a more flexible shaping of the spectral response of the filter. The sensitivity with respect to nonlinear effects is carefully investigated. Operation over a wavelength spectrum of 20 nm is demonstrated, making the device suitable for channel subset selection in WDM systems, reconfigurable filters for gridless networking and adaptive filtering of signals.