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Microring optical modulators are being explored extensively forenergy-efficient photonic communication networks in future high-performancecomputing systems and microprocessors, because they can significantly reducethe power consumption of optical transmitters via the resonant circulation oflight. However, resonant modulators have traditionally suffered from atrade-off between their power consumption and maximum operation bit rate, whichwere thought to depend oppositely upon the cavity linewidth. Here, we breakthis linewidth limitation using a silicon microring. By controlling the rate atwhich light enters and exits the microring, we demonstrate modulation free ofthe parasitic cavity linewidth limitations at up to 40 GHz, more than 6x thecavity linewidth. The device operated at 28 Gb/s using single-ended drivesignals less than 1.5 V. The results show that high-Q resonant modulators canbe designed to be simultaneously low-power and high-speed, features which aremutually incompatible in typical resonant modulators studied to date.

Breaking the cavity linewidth limit of resonant optical modulators