Abstract

We experimentally demonstrate a broadband, fabrication-tolerant compact silicon waveguide taper (34.2 μm) in a silicon-on-insulator wire waveguide. The taper works on multimode interference along the length of the taper. A single taper design has broadband operation with coupling efficiency $>70\%$ over 700 nm that can be used in O-, C-, and L-bands. The compact taper is highly tolerant to fabrication variations; $\pm 100\mathrm{nm}$ change in the taper and end waveguide width varies the taper transmission by $<5\%$. The footprint of the device, i.e., the taper along with linear gratings, is $\approx 442{\mathrm{\mu m}}^2$, $11.5\times$ smaller than the adiabatic taper. The taper with linear gratings provides coupling efficiency comparable to standard focusing gratings. We have also experimentally compared the translational and rotational alignment tolerance of the focusing grating with linear grating couplers.

© 2019 Optical Society of America

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