title: Polarization rotator based on augmented low-index-guiding waveguide on silicon nitride/silicon-on-insulator platform.
abstract: Using a newly proposed augmented low-index-guiding scheme with silicon nitride/silicon dual-core waveguide, we have designed, fabricated, and characterized a transverse electric (TE) to transverse magnetic (TM) and TM-to-TE compact polarization rotator. The polarization rotation is realized in an asymmetric directional coupler. The measured peak conversion efficiencies for the TE-to-TM and TM-to-TE rotations are approximately 97%. The measured polarization extinction ratio for the TE-to-TM rotation is greater than 20 dB over 50-nm bandwidth, while for the TM-to-TE rotation it is greater than 15 dB over the C-band.
authors.forename: X
authors.initials: X
authors.lastname: Sun
authors.forename: M Z
authors.initials: MZ
authors.lastname: Alam
authors.forename: J S
authors.initials: JS
authors.lastname: Aitchison
authors.forename: M
authors.initials: M
authors.lastname: Mojahedi