Analysis of Mode Hybridization in Tapered Waveguides

Author

Jingshu Guo ; Yanli Zhao

Author_Institution

Wuhan Nat. Lab. for Optoelectron., Wuhan, China

Volume

27

Issue

23

fYear

2015

Firstpage

2441

Lastpage

2444

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2468059

Filename

7194759