Generation rate scaling: the quality factor optimization of microring resonators for photon-pair sources

Kai Guo*, Xiaodong Shi, Xiaolin Wang, Junbo Yang, Yunhong Ding, Haiyan Ou, Yijun Zhao

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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To achieve photon-pair generation scaling, we optimize the quality factor of microring resonators for efficient continuous-wave-pumped spontaneous four-wave mixing. Numerical studies indicate that a high intrinsic quality factor makes high pair rate and pair brightness possible, in which the maximums take place under overcoupling and critical-coupling conditions, respectively. We fabricate six all-pass-type microring resonator samples on a silicon-on-insulator chip involving gap width as the only degree of freedom. The signal count rate, pair brightness, and coincidence rate of all the samples are characterized, which are then compared with the modified simulations by taking the detector saturation and nonlinear loss into account. Being experimentally validated for the first time to the best of our knowledge, this work explicitly demonstrates that reducing the round-trip loss in a ring cavity and designing the corresponding optimized gap width are more effective to generate high-rate or high-brightness photon pairs than the conventional strategy of simply increasing the quality factor. (C) 2018 Chinese Laser Press
Original languageEnglish
JournalPhotonics Research
Issue number6
Pages (from-to)587-596
Publication statusPublished - 2018


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