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Optical nonreciprocal devices for silicon photonics using wafer-bonded magneto-optical garnet materials

Published online by Cambridge University Press:  11 June 2018

Tetsuya Mizumoto ,
Roel Baets  and
John E. Bowers
Tetsuya Mizumoto
Affiliation:
Tokyo Institute of Technology, Japan; tmizumot@pe.titech.ac.jp
Roel Baets
Affiliation:
Ghent University, Belgium; roel.baets@ugent.be
John E. Bowers
Affiliation:
Departments of Electrical and Computer Engineering and Materials, University of California, Santa Barbara, USA; bowers@ece.ucsb.edu
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Abstract

Optical isolators and circulators are important elements in many photonic systems. These nonreciprocal devices are typically made of bulk optical components and are difficult to integrate with other elements of photonic integrated circuits. This article discusses the best performance for waveguide isolators and circulators achieved with heterogeneous bonding. By virtue of the bonding technology, the devices can make use of a large magneto-optical effect provided by a high-quality single-crystalline garnet grown in a separate process on a lattice-matched substrate. In a silicon-on-insulator waveguide, the low refractive index of the buried oxide layer contributes to the large penetration of the optical field into a magneto-optical garnet used as an upper-cladding layer. This enhances the magneto-optical phase shift and contributes greatly to reducing the device footprint and the optical loss. Several versions of silicon waveguide optical isolators and circulators, both based on the magneto-optical phase shift, are demonstrated with an optical isolation ratio of ≥30 dB in a wavelength band of 1550 nm. Furthermore, the isolation wavelength can be effectively tuned over several tens of nanometers.

Keywords

magneto-opticopticaldevicesbonding
Type
Materials for Nonreciprocal Photonics
Information
MRS Bulletin , Volume 43 , Issue 6: Materials for Nonreciprocal Photonics , June 2018 , pp. 419 - 424
Copyright
Copyright © Materials Research Society 2018 

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