We present compact crossings for silicon-on-insulator photonic wires. The waveguides are broadened using a $3\mathrm{\mu }\mathrm{m}$ parabolic taper in each arm. By locally applying a lower index contrast using a double-etch technique, loss of confinement is reduced and $97.5\%$ transmission $(-1.7\mathrm{dB})$ is achieved with only $-40\mathrm{dB}$ cross talk.

© 2007 Optical Society of America

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