Silicon microring resonators

By Wim Bogaerts, Peter DeHeyn, Thomas VanVaerenbergh, Katrien M. Devos, Shankar Kumar Selvaraja, T. Claes, Pieter Dumon, Peter Bienstman, D. Vanthourhout, R. Baets. 2012

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Optical frequency comb technology for ultra‐broadband radio‐frequency photonics (2014, background): “Other recent efforts have focused on the development of passive delay lines [177] [178] and band-pass filters [179].”
Low-power, chip-based stimulated Brillouin scattering microwave photonic filter with ultrahigh selectivity (2014, background): “However, these filters typically exhibit limited resolution (GHz instead of MHz linewidths) and are plagued by trade-offs between key parameters, such as between the frequency tuning range and the resolution for multi-tap filters [9-13]; or between the peak rejection and the resolution for resonator”
Taking silicon photonics modulators to a higher performance level: state-of-the-art and a review of new technologies (2021, background): “However, these RR-based devices suffer from high temperature and fabrication sensitivity.(130,131) Literature reports solving these problems to a certain extent through smart design strategies and technological advancements.”
Attojoule Optoelectronics for Low-Energy Information Processing and Communications (2016, background): “As a result, for low-energy devices, the FCP requires very high optical concentration to operate, as in high-Q ring [107], [108] or disk [105] resonator”