Abstract
A coupler-type transverse electric/transverse magnetic (TE/TM) polarization
splitter, in which a metal-loaded core is slightly widened, is analyzed using
the three-dimensional beam-propagation method. Before analyzing the splitter
with the slightly different core widths, the performance of a splitter with
two identical cores is evaluated. The use of the two identical cores results
in a high crosstalk and a low extinction ratio due to the phase mismatch between
the waveguides with and without the metal for the TE mode. Therefore, the
core width in the metal-loaded waveguide is slightly widened so as to restore
the phase-matching condition. In contrast to the conventional splitter with
the two identical cores, the present splitter is found to offer a low crosstalk
of less than $-$30 dB and
a high extinction ratio of more than 30 dB with a coupling efficiency of more
than 97% at a wavelength of 1.55 $\mu{\rm
m}$. In addition, the wideband operation is demonstrated over
a wavelength range of 1.50 to 1.61 $\mu{\rm
m}$.
© 2008 IEEE
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