Abstract
We demonstrate tunable broadband two-mode power dividers based on a wavelength-insensitive coupler for a mode-division multiplexing system. Ultra-small ${{\rm{TE}}_0} {-} {{\rm{TE}}_1}$ and ${{\rm{TE}}_0} {-} {{\rm{TE}}_2}$ mode dividers based on Si-wire waveguides are designed based on the coupled-mode theory. Tunability is achieved by using the thermo-optic effect. In both dividers, arbitrary branching ratios can be realized over a wide wavelength range. We experimentally demonstrated for the first time, to the best of our knowledge, a tunable ${{\rm{TE}}_0} {-} {{\rm{TE}}_1}$ mode divider based on Si-wire waveguides. From the experimental results, an arbitrary branching ratio can be achieved by adjusting the injection current to a TiN heater placed on top of one of the delay lines.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Liang Zhang and Jinbiao Xiao
J. Opt. Soc. Am. B 38(10) 2830-2836 (2021)
Yufei Chen and Jinbiao Xiao
J. Opt. Soc. Am. B 38(10) 3064-3070 (2021)
Yi Liang, Yin Xu, Yue Dong, Bo Zhang, and Yi Ni
J. Opt. Soc. Am. B 38(10) 2908-2914 (2021)