Abstract

A multi-channel mode (de)multiplexer based on the supermode evolution in cascaded dual-core adiabatic tapers is designed and realized with ultrathin (50  nm) silicon-on-insulator nanowire waveguides. This dual-core adiabatic taper is designed optimally, so that all the supermodes are confined in the wide core at the input end and the highest-order supermode is localized in the narrow core at the output end. In this way, the highest-order supermode is dropped as the fundamental mode at the cross port. As an example, a (de)multiplexer with three mode channels is designed and fabricated. From the measured spectral responses, the fabricated device has a crosstalk lower than 20  dB and an excess loss less than 0.2 dB in a bandwidth of 65  nm.

© 2017 Optical Society of America

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