Abstract

A compact-sized electrically tunable ${\rm TE}$-${\rm TM}$ mode splitter composed of a mode converter and an asymmetric Y-branch structure is presented. The asymmetric Y-branch consists of a straight and a bent waveguides to split two polarization modes based on the mode-sorting effect. To shorten the device length, a simplified coherently coupled-bending structure is utilized for the bent waveguide. Experimental results show that the device length is reduced about 52%, extinction ratios of both ${\rm TE}$ and ${\rm TM}$ modes are higher than 25 dB, yet the applied voltage is not significantly increased.

© 2009 IEEE

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