Abstract
An ultracompact triplexer which could be used for both polarizations is designed
by utilizing directional couplers based on submicron silicon rib waveguides. First, the
polarization insensitive directional couplers are realized by carefully choosing
cross-sectional geometry of the waveguide. The length of the coupling region in the
first directional coupler is chosen to separate the three wavelengths (i.e., 1490 nm to
one port, 1310 and 1550 nm to the other port). The second directional coupler separates
the wavelengths of 1310 and 1550 nm. For the channel of 1490 nm, an additional
directional coupler is used to reduce the crosstalk from the 1310 and 1550 nm channels.
The total length of the present triplexer is only 400 $\mu{\rm m}$, and simulation with
three-dimensional Beam Propagation Method shows good performances for both
polarizations.
© 2009 IEEE
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