Abstract
We propose and investigate the optimal design of a nonperiodic
grating-assisted directional coupler by iterative methods using the
beam propagation method. Computer simulations were carried out at
wavelengths of 0.8, 1.3, and 1.5 µm, which are often used in
optical communications and networking. We found that the complete
power coupling lengths can be reduced considerably in comparison with
those in the case of the periodic grating-assisted waveguides with the
same set of parameters.
© 2001 Optical Society of America
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