Abstract
A simple polarization converter using an L-figured waveguide is analyzed
by the imaginary-distance beam-propagation method based on Yee's mesh and
the finite-difference time-domain method. It is revealed at a wavelength of
1.55 μm
that the polarization conversion length is 3.24 μm with an insertion loss of 0.46
dB. To achieve a wideband operation, we determine a device length by the effective
index difference between the two eigenmodes generated in the L-figured waveguide.
As a result, an extinction ratio of more than 20 dB is obtained over a wide
wavelength range of 1.3 to 1.6 μm. Finally, to reduce the insertion loss, we propose a modified
structure, in which two corners in a diagonal position are cut with an angle
of 90$^\circ$.
© 2013 IEEE
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