Abstract

A dual-mode waveguide crossing is proposed and realized for the application of on-chip multimode interconnection. The present structure is realized by two 90° crossed multimode-interference (MMI) couplers. By properly choosing the width and length of the MMI section, the self-images for both the incident TM0 mode and the TM1 mode could be at the center of the crossing. The characterization results for the fabricated device show that low insertion loss below 1.5  dB and low crosstalk below 18  dB can be achieved over a large bandwidth more than 80 nm for both the TM0 and TM1 modes.

© 2016 Optical Society of America

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