title: Compact polarization rotator on silicon for polarization-diversified circuits.
abstract: We demonstrate a polarization rotator based on adiabatic mode evolution on silicon for polarization-diversified circuits. The rotator has a device length of 420 μm, a polarization-conversion efficiency of more than 90%, and an insertion loss less than 1 dB for a wavelength range of 80 nm. Combining the rotator with a compact, broadband polarization beam splitter based on cascaded directional couplers enhances the polarization conversion extinction ratio to over 30 dB with less than 1.5 dB total insertion loss over a 60 nm spectral range.
authors.affiliation: Bell Laboratories, Alcatel-Lucent, Holmdel, New Jersey 07733, USA. long_l_chen@alcatel‑lucent.com
authors.forename: Long
authors.initials: L
authors.lastname: Chen
authors.forename: Christopher R
authors.initials: CR
authors.lastname: Doerr
authors.forename: Young-Kai
authors.initials: YK
authors.lastname: Chen