Compact Mach–Zehnder Interferometer Ce:YIG/SOI Optical Isolators

Author

Ghosh, Samir ; Keyvaninia, Shahram ; Shoji, Yuya ; Van Roy, Wim ; Mizumoto, Tetsuya ; Roelkens, Gunther ; Baets, Roel G.

Author_Institution

Dept. of Inf. Technol., Ghent Univ., Ghent, Belgium

Volume

24

Issue

18

fYear

2012

Firstpage

1653

Lastpage

1656

Abstract

We demonstrate an optical isolator integrated with a silicon-on-insulator waveguide platform realized by the adhesive bonding of a Ce:YIG/SGGG die on top of a Mach-Zehnder interferometer (MZI). The design is based on the different nonreciprocal phase shifts (NRPS) experienced by both arms of the interferometer, which have different waveguide widths. Simulation of NRPS versus silicon waveguide width is shown for a few different benzocyclobutene bonding layer thicknesses for a particular silicon waveguide thickness and Ce:YIG/SGGG stack. Variations of NRPS as a function of MZI arm lengths with bonded stack on top of MZI are measured. Optical isolation of 11 dB is experimentally obtained for a device with a footprint of 1.5 mm × 4 μm.

Keywords

Mach-Zehnder interferometers; cerium; gadolinium compounds; optical isolators; optical waveguides; organic compounds; silicon-on-insulator; yttrium compounds; Ce:YIG/SGGG die; Ce:YIG/SGGG stack; Ce:YIG/SOI optical isolators; Si; Y₃Fe₅O₁₂-Gd₃Ga₅O₁₂:Ce; adhesive bonding; benzocyclobutene bonding layer thicknesses; compact Mach-Zehnder interferometer; nonreciprocal phase shifts; particular silicon waveguide thickness; silicon-on-insulator waveguide; Integrated optics; Isolators; Magnetic fields; Optical interferometry; Optical polarization; Optical waveguides; Silicon; Benzocyclobutene bonding; Ce:YIG; isolator; silicon on-insulator (SOI);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2212426

Filename

6263269