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We report a low-power silicon photonic ringresonator switch integrated with a CMOS driver that achieves sub 3.5-ns transition times, below -20-dB crosstalk, and ~1-mW combined switch and driver power consumption. Results are compared to nonresonant Mach-Zehnder based switches. IntroductionDiscrete silicon photonic switches have previously demonstrated hundreds of Gb/s of throughput bandwidth and nanosecond-scale switching speeds [1][2][3][4][5]. Monolithic integration of these optical switches with digital complementary metal-oxide-semiconductor (CMOS) driver circuits is ultimately required to minimize power and area. Here, we compare two photonic switches based on ring resonator and Mach-Zehnder devices, each integrated with digital CMOS drivers, to explore fundamental tradeoffs in optical bandwidth, power dissipation and footprint.

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