Abstract
We present a theoretical model of a multi-input arrayed waveguide grating (AWG) based on Fourier optics and
apply the model to the design of a flattened passband response. This modeling makes it possible to systematically
analyze spectral performance and to clarify the physical mechanisms of the multi-input AWG. The model suggested that
the width of an input/output mode-field function and the number of waveguides in the array are important factors to
flatten the response. We also developed a model for a novel AWG employing cascaded Mach–Zehnder
interferometers connected to the AWG input ports and numerically analyzed its optical performance to achieve
low-loss, low-crosstalk, and flat-passband response. We demonstrated the usability of this model through
investigations of filter performance. We also compared the filter spectrum given by this model with that given by
simulation using the beam propagation method.
© 2007 IEEE
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