Open AccessCompact multi-million Q resonators and 100 MHz passband filter bank in a thick-SOI photonics platform
Author(s) -
Bohan Zhang,
Kenaish Al Qubaisi,
Matteo Cherchi,
Mikko Harjanne,
Yossef Ehrlichman,
Anatol Khilo,
Miloš A. Popović
Publication year - 2020
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.395203
Subject(s) - resonator , free spectral range , passband , silicon on insulator , optics , bandwidth (computing) , insertion loss , optical ring resonators , return loss , optoelectronics , physics , band pass filter , materials science , microwave , dielectric resonator antenna , electrical engineering , telecommunications , silicon , engineering , antenna (radio)
We demonstrate ring and racetrack resonators with Q s of 3.8 to 7.5 million and 100 MHz bandwidth racetrack resonator filters, implemented in a thick silicon-on-insulator foundry platform that features a 3 µm thick device layer. We show that special racetrack resonators (with weakly guiding straight sections that transition to strongly confining bends) implemented in this platform can be preferable to rings for applications such as integrated microwave-photonic signal processing that require filters with sub-GHz bandwidth, tens of GHz of free spectral range (FSR), and a compact footprint for dense system-on-chip integration. We demonstrate ring resonators with 7.5×10 6 intrinsic Q , but limited FSR of 5.1 GHz and a taxing footprint of 21 m m 2 due to a large 2.6 mm bend-loss-limited radius. In comparison, we demonstrate two racetrack resonator designs with intrinsic Q s of 3.8×10 6 and 4.3×10 6 , larger respective FSRs of 11.6 GHz and 7.9 GHz, and less than 1/20 t h the area of the ring resonator. Using racetrack resonators, we implemented a four-channel, 100 MHz wide passband filter bank with 4.2 to 5.4 dB insertion loss to drop ports.