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Leveraging the spatial modes of multimode waveguides using mode-divisionmultiplexing (MDM) on an integrated photonic chip allows unprecedented scalingof bandwidth density for on-chip communication. Switching channels betweenwaveguides is critical for future scalable optical networks, but itsimplementation in multimode waveguides must address how to simultaneouslycontrol modes with vastly different optical properties. Here we present aplatform for switching signals between multimode waveguides based onindividually processing the spatial mode channels using single-mode elements.Using this wavelength-division multiplexing (WDM) compatible platform, wedemonstrate a 1x2 multimode switch for a silicon chip which routes four datachannels with low (<-20 dB) crosstalk. We show bit-error rates below 10^-9 andpower penalties below 1.4 dB on all channels while routing 10 Gbps data wheneach channel is input and routed separately. The switch exhibits an additionalpower penalty of less than 2.4 dB when all four channels are simultaneouslyrouted.

Integrated switch for simultaneous mode-division multiplexing (MDM) and wavelength-division multiplexing (WDM)