Open AccessUltra-short Silicon-On-Insulator (SOI) polarization rotator between a slot and a strip waveguide based on a nonlinear raised cosine flat-tip taper
Author(s) -
Guoqiang Chen,
Lixue Chen,
Weiqiang Ding,
Fangkui Sun,
Rui Feng
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.014888
Subject(s) - finite difference time domain method , optics , silicon on insulator , polarization (electrochemistry) , materials science , extinction ratio , trigonometric functions , coupled mode theory , nonlinear system , finite element method , wavelength , waveguide , silicon , physics , refractive index , optoelectronics , geometry , chemistry , mathematics , quantum mechanics , thermodynamics
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.