Abstract
A compact waveguide crossing structure with low transmission losses and negligible crosstalk is demonstrated for silicon-on-insulator circuits. The crossing structure is based on a mode expander optimized by means of a genetic algorithm leading to transmission losses lower than and crosstalk and reflection losses below in a broad bandwidth of . Furthermore, the resulting crossing structure has a footprint of only and does not require any additional fabrication steps.
© 2009 Optical Society of America
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