Abstract
We propose an ultra-compact multimode interference (MMI) power splitter based on the Kerr
nonlinear effect from simulations using modal propagation analysis. Crystalline polydiacetylene is
used as the core layer to allow for the creation of a power splitter with a high number of outputs
with the shortest possible multimode waveguide length operating in the nonlinear regime. The 11
high-contrast, high-resolution images at the end of the multimode waveguide in the simulated power
splitter have a high power balance, whereas access to a high number of self-images is not possible
under the linear regime in the proposed length range. The compact dimensions and ideal performance
of the device are established according to optimized parameters. The proposed regime can be
extended to the design of
$M {\times} N$
power splitters. The results of this study indicate that nonlinear modal
propagation analysis solves the miniaturization problem for all-optical devices based on MMI
couplers to achieve multiple functions in a compact planar integrated circuit and also overcomes
the limitations of previously proposed methods for nonlinear MMI. The results are verified using a
numerical method.
© 2014 IEEE
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