Abstract

A novel adiabatic mode multiplexer enables a $2\times 2$ optical switch whose operation does not depend on accumulated phase due to evanescent coupling between waveguides. The adiabatic mode multiplexer has a negligible insertion loss over $C+L$ bands and modal cross talk better than $-40\mathrm{dB}$ for any polarization state. Mode multiplexing is achieved by adiabatic transition from the fundamental mode of the single-mode waveguide to the higher mode of the multimode waveguide. Experimental measurement results for a device realized in silica-on-silicon technology are presented. By directly measuring the nonadiabatic transition probability, we show that the adiabatic mode multiplexer operates in the Landau–Zener regime.

© 2005 Optical Society of America

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