Authors:	S. Ghosh, S. Keyvaninia, Y. Shitaro, T. Mizumoto, G. Roelkens, R. Baets
Title:	Optical isolator for TE polarized light realized by adhesive bonding of Ce:YIG on Silicon-on-Insulator waveguide circuits
Format:	International Journal
Publication date:	5/2013
Journal/Conference/Book:	IEEE Photonics Journal
Volume(Issue):	5(3) p.6601108
DOI:	10.1109/jphot.2013.2264275
Citations:	46 (Dimensions.ai - last update: 14/4/2024) 27 (OpenCitations - last update: 10/5/2024) Look up on Google Scholar
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Abstract

An optical isolator for transverse electric (TE) polarized light is demonstrated by adhesive
bonding of a ferrimagnetic garnet die on top of a 380 nm thick silicon waveguide circuit. Polarization
rotators are implemented in the arms of a nonreciprocal Mach-Zehnder interferometer to rotate the
polarization to transverse magnetic in the nonreciprocal phase shifter regions. Calculation of the
nonreciprocal phase shift (NRPS) as a function of bonding layer thickness experienced by the TM
mode in the interferometer arms is presented, together with the simulation of the robustness of the
polarization rotator. Experimentally, 32 dB isolation is measured at 1540.5 nm wavelength using a
magnetic field transverse to the light propagation directions.