Abstract
A novel polarization converter using a triangular waveguide is proposed
and analyzed by the imaginary-distance beam-propagation method based on Yee's
mesh and the finite-difference time-domain method. The polarization conversion
length is investigated as a function of relative refractive index difference.
It is found, for a silicon core embedded in a silica cladding, that the conversion
length is 2 $\mu$m, while
the insertion loss is 0.5 dB at a wavelength of 1.55 $\mu$m. The extinction ratio is more than 20 dB over
a wide wavelength range of 1.25 to 1.65 $\mu$m. Using a geometrically expanded model, the polarization conversion
behavior is verified in the experiment at a microwave frequency of 15 GHz.
Finally, reasonable polarization conversion is obtained with a modified structure,
in which the two corners of the triangular waveguide are cut and the cut plane
is aligned with a square input (output) waveguide.
© 2008 IEEE
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