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Differential Ring Modulator
Team member: Saman Saeedi (In collaboration with CHIC group)

Compact, low-power, and high-speed electro-optic modulators (EOM) are one of the key components for optical interconnects. Resonant structures such as micro-ring modulators are promising candidates due to their compact size and low power consumption. It is desirable to have high-Q rings since for a given extinction ratio a higher Q results in better energy efficiency. However, there is a trade-off between the Q of the ring resonator modulator and its optical bandwidth. In this project we propose a new structure that breaks the optical bandwidth/quality factor trade-off known to limit the speed of high-Q micro-ring modulators. This structure, called the “differential ring modulator", maintains a constant energy in the ring to avoid pattern-dependent power droop.



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