  A compact (15{\mu}m${\times}${\mu}m) and highly-optimized 2${\times}$2
optical switch is demonstrated on a CMOS-compatible photonic crystal
technology. On-chip insertion loss are below 1dB, static and dynamic contrast
are 40dB and >20dB respectively. Owing to efficient thermo-optic design, the
power consumption is below 3 mW while the switching time is 1 {\mu}s.
