Abstract
A fast design method, based on the reciprocity theory, is presented for the
optimal design of a special input structure (e.g., a parabolic waveguide horn)
connected at the end of the input waveguide for flattening the spectral response of
an arrayed-waveguide-grating (AWG) demultiplexer. The spectral response is
calculated by reversal of the propagation direction of light in the AWG
demultiplexer. Light is transmitted from the output waveguide and finally focused at
the interface between the first free-propagation region (FPR) and the special input
structure. When the special input structure in the optimization is adjusted, the
distribution of the focused field (in the first FPR) excited by the modal field of
the output waveguide remains unchanged and needs to be calculated only once. The
optimal design of a parabolic waveguide horn for a flat-top AWG demultiplexer is
given as a numerical example to illustrate the fast design method.
© 2003 Optical Society of America
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