title: Ultra-short silicon-on-insulator (SOI) polarization rotator between a slot and a strip waveguide based on a nonlinear raised cosine flat-tip taper.
abstract: A design of ultra-short integrated polarization rotator (PR) with nonlinear and flat-tip tapers is demonstrated theoretically. Based on mode-evolution theory and three-dimensional (3D) finite-difference time-domain (FDTD) simulation, raised cosine profiled tapers are introduced and optimized in the transition region, which improve the polarized modes coupling and decrease the conversion length to 6 μm for the wavelength of 1.55 μm. Numerical simulations obtain extinction ratio of 32 dB and loss of 0.14 dB with practical material parameters. The method and result presented here can be extremely valuable for applications in polarization diversity circuits.
authors.affiliation: Physics Department, Harbin Institute of Technology (HIT), Harbin 150001, China. gqchen.china@gmail.com
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Chen
authors.forename: Lixue
authors.initials: L
authors.lastname: Chen
authors.forename: Weiqiang
authors.initials: W
authors.lastname: Ding
authors.forename: Fangkui
authors.initials: F
authors.lastname: Sun
authors.forename: Rui
authors.initials: R
authors.lastname: Feng
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004553:Electric Conductivity; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry*
chemical_list: D012825:Silicon