We demonstrate that by coherent driving two uncoupled rings in same direction, the effective photon circulating time in the dual ring modulator is reduced, with increased modulation quality. The inter-ring detuning dependent photon dynamics, Q-factor, extinction ratio and optical modulation amplitude of two cascaded silicon ring resonators are studied and compared with that of a single ring modulator. Experimentally measured eye diagrams, together with coupled mode theory simulations, demonstrate the enhancement of dual ring configuration at 20 Gbps with a Q ~ 20,000.
@article{arxiv.1407.5704,
title = {Cascaded uncoupled dual-ring modulator},
author = {Tingyi Gu and Young-kai Chen and Chee Wei Wong and Po Dong},
journal= {arXiv preprint arXiv:1407.5704},
year = {2015}
}