Abstract

An electro-optic controllable transverse electric/transverse magnetic (TE/TM) polarization converter based on the $\mathrm{GaN}/{\mathrm{Al}}_{0.3}{\mathrm{Ga}}_{0.7}\mathrm{N}$ superlattice waveguide is proposed for actively controlling the output polarization state. We use the highly accurate and efficient full-vector mode-matching method to evaluate its performance. The result indicates that the output polarization state can be actively controlled in a full 0°–90° range by applying the adjustable voltage on this converter, and that a full $\mathrm{TE}\leftrightarrow \mathrm{TM}$ conversion is also realizable by applying no voltage. Moreover, this converter has a high conversion efficiency of 99.9%, a low insertion loss of 0.03 dB, and a wide bandwidth (FWHM) of 200 nm. We further investigate the deviation effect of the etching width or the operating wavelength on $\mathrm{TE}\leftrightarrow \mathrm{TM}$ conversion. In order to counteract deterioration on conversion efficiency brought on by the deviation, a simple compensation method is presented by actively adjusting the voltage to a certain value.

© 2018 Optical Society of America

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