Title :
Analysis of Mode Hybridization in Tapered Waveguides
Author :
Jingshu Guo ; Yanli Zhao
Author_Institution :
Wuhan Nat. Lab. for Optoelectron., Wuhan, China
Abstract :
The mode hybridization of tapered submicron silicon optical waveguides is analyzed by eigenmode expansion. We study the mode conversion effects related to the waveguide vertical symmetries and taper lengths. A curving design for TM-TE high-order mode conversion in single effective index line is presented by us, which is shorter than the reported linear taper design. Besides, we propose a new type of mode conversion between TM and TE high-order mode, which is called the crossband conversion. The novel design has wide bandwidth and good fabrication tolerance. These concepts can be useful for high-order modes control issues, such as TM mode guiding from very wide to narrow waveguide core.
Keywords :
eigenvalues and eigenfunctions; integrated optics; optical design techniques; optical fabrication; optical waveguides; silicon; silicon-on-insulator; Si; TM mode; TM-TE high-order mode conversion; crossband conversion; curving design; eigenmode expansion; fabrication tolerance; linear taper design; mode hybridization; single effective index line; taper lengths; tapered submicron silicon optical waveguides; waveguide core; waveguide vertical symmetry; Couplings; Indexes; Optical polarization; Optical waveguides; Optimized production technology; Shape; Silicon; Integrated optics; mode converter; silicon on-insulator (SOI); tapered waveguides;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2468059
