Magneto-Optical Microring Switch Based on Amorphous Silicon-on-Garnet Platform for Photonic Integrated Circuits

Toshiya MURAI  Yuya SHOJI  Nobuhiko NISHIYAMA  Tetsuya MIZUMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E103-C   No.11   pp.645-652
Publication Date: 2020/11/01
Publicized: 2020/06/05
Online ISSN: 1745-1353
DOI: 10.1587/transele.2019OCP0003
Type of Manuscript: INVITED PAPER (Special Section on Opto-electronics and Communications for Future Optical Network)
photonic integrated circuits,  magneto-optical,  material,  microring resonator,  optical switch,  

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Magneto-optical (MO) switches operate with a dynamically applied magnetic field. The MO devices presented in this paper consist of microring resonators (MRRs) fabricated on amorphous silicon-on-garnet platform. Two types of MO switches with MRRs were developed. In the first type, the switching state is controlled by an external magnetic field component included in the device. By combination of MO and thermo-optic effects, wavelength tunable operation is possible without any additional heater, and broadband switching is achievable. The other type of switch is a self-holding optical switch integrated with an FeCoB thin-film magnet. The switching state is driven by the remanence of the integrated thin-film magnet, and the state is maintained without any power supply.