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In this work, we describe a procedure for synthesizing racetrack resonatorswith large quality factors and apply it to realize a multi-channelwavelength-selective switch (WSS) on a silicon photonic chip. We firstdetermine the contribution of each component primitive to propagation loss in aracetrack resonator and use this data to develop a model for the frequencyresponse of arbitrary order, coupled-racetrack channel dropping filters. Wedesign second-order racetrack filters based on this model and cascade multiplesuch filters to form a 1x7 WSS. We find good agreement between our model anddevice performance with second-order racetrack that have ~1 dB of drop-portloss, ~2 GHz FWHM linewidth, and low optical crosstalk due to the quick filterroll-off of ~ 5.3 dB/GHz. Using a control algorithm, we show three-channeloperation of our WSS with a channel spacing of only 10 GHz. Owing to the highquality factor and quick roll-off of our filter design, adjacent channelcrosstalk is measured to be <-25 dB for channels spaced on a 10 GHz grid. As afurther demonstration, we use five of seven WSS channels to perform ademultiplexing operation on both an 8 GHz and a 10 GHz grid. These resultssuggest that a low-loss WSS with fine channel resolution can be realized in ascalable manner using the silicon photonics platform.

Fine-Resolution Silicon Photonic Wavelength-Selective Switch Using Hybrid Multimode Racetrack Resonators