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.
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