Authors:	S. Ghosh, S. Keyvaninia, Y. Shoji, W. Van Roy, T. Mizumoto, G. Roelkens, R. Baets
Title:	Compact Mach-Zehnder Interferometer Ce:YIG/SOI Optical Isolator
Format:	International Journal
Publication date:	9/2012
Journal/Conference/Book:	Photonics Technology Letters
Volume(Issue):	24(18) p.1653-1656
DOI:	10.1109/LPT.2012.2212426
Citations:	25 (Dimensions.ai - last update: 14/4/2024) 17 (OpenCitations - last update: 10/5/2024) Look up on Google Scholar
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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.