Abstract
The full-vectorial beam-propagation method is applied to the assessment
of the coupling characteristics between strongly guiding waveguides stacked
laterally. The polarization crosstalk behavior of square waveguides stacked
laterally is demonstrated by the eigenmode and beam-propagation analyses.
In order to make use of the polarization crosstalk constructively, we determine
the vertical spacing between the two square waveguides.
Almost complete conversion can be obtained, when the two waveguides are stacked
diagonally. Another coupler composed of two rectangular waveguides is studied
to realize the polarization conversion without exchanging the power with the
same polarization. A crossing-waveguide-type polarization converter is also
developed, with a short device length of less than 80 $\mu {\hbox {m}}$ at a wavelength of 1.55 $\mu {\hbox {m}}$.
© 2009 IEEE
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