Abstract
The rigorous Floquet-Block mode expansion1 used in the past to discuss off-resonance grating waveguide coupling is extended to the on-resonance condition using the method of grating eigenfunctions.2 The results of this theory are applied to a discussion of the grating/waveguide coupling problem as well as to the outcoupling of surface-emitting DFB and DBR lasers. Of special concern are second-order grating devices with thick metal gratings which cannot be handled by perturbation theory.
© 1989 Optical Society of America
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