Open AccessSubwavelength-grating-assisted silicon polarization rotator covering all optical communication bands
Author(s) -
Hongnan Xu,
Yaocheng Shi
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.005588
Subject(s) - extinction ratio , polarization rotator , optics , materials science , polarization (electrochemistry) , silicon , grating , broadband , wavelength , silicon on insulator , optoelectronics , diffraction grating , birefringence , physics , chemistry
We propose an ultra-broadband and ultra-compact polarization rotator (PR) structure on the silicon-on-insulator platform. The subwavelength gratings (SWGs) are introduced at the waveguide corner in order to excite the hybridized modes and realize the polarization rotation. The dispersion-engineered SWG can dramatically reduce the polarization conversion length deviation. High polarization extinction ratio > 20 dB and low excess loss < 1 dB can be achieved over 1.26-1.675 μm wavelength range, which covers O-, E-, S-, C-, L-, and U-bands. The total device size is as small as 4.8 × 0.34 μm 2 . To the best of our knowledge, the proposed structure is the first silicon PR that could cover all of the optical communication bands.