期刊
IEICE ELECTRONICS EXPRESS
卷 19, 期 2, 页码 -出版社
IEICE-INST ELECTRONICS INFORMATION COMMUNICATION ENGINEERS
DOI: 10.1587/elex.18.20210500
关键词
silicon photonics; optical isolators; micro ring resonators; magneto-optical materials; cobalt ferrite films
资金
- JST CREST [JP-MJCR18T4]
- JSPS KAKENHI [19H02190]
- NEDO [JPNP13004, JPNP16007]
- Suematsu Fund
This paper experimentally demonstrates a silicon optical isolator using a monolithically integrated cobalt ferrite film as a magneto-optical material, achieving an isolation ratio of 9.6 dB near a wavelength of 1550 nm. The device has a compact size compared to current yttrium iron garnet-based isolators due to the large Faraday rotation coefficient of cobalt ferrite. Furthermore, self-biased isolation is achieved through the strong remanence of cobalt ferrite films, eliminating the need for an external magnet. Cobalt ferrite represents a potential alternative to yttrium iron garnets for realizing practical on-chip isolation devices in silicon photonic integrated circuits due to its small footprint.
We experimentally demonstrated a silicon optical isolator using a monolithically integrated cobalt ferrite (CFO) film as magneto-optical material, achieving an isolation ratio of 9.6 dB near 1550 nm wavelength. By virtue of the large Faraday rotation coefficient of CFO, the device has a compact footprint comparing to the current yttrium iron garnet-based isolators. Furthermore, we demonstrated self-biased isolation by the strong remanence of CFO films, eliminating the tedious demand of an external magnet. Cobalt ferrite represents a potential alternative approach to yttrium iron garnets to realize a practical device for on-chip isolation in silicon photonic integrated circuits because of the small footprint.
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