Abstract
Multilayer thin-film waveguides (MTFWs) are analyzed using the beam-propagation method based on Yee's mesh.
The birefringence properties of the MTFW are demonstrated by the eigenmode analysis based on the imaginary-distance
procedure. Taking advantage of the birefringence, a polarization splitter composed of two parallel MTFWs is
proposed. Calculation shows that a short device length of 270 <i>µ</i>m is obtainable with crosstalks of -33.5 dB for the
quasi-transverse-electric mode and -20.7 dB for the
quasi-transverse-magnetic mode. A crossing-type polarization splitter is also developed, and the device length is
further reduced to 120 <i>µ</i>m.
© 2007 IEEE
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