Effective-index method and coupled-mode theory for almost-periodic waveguide gratings: a comparison
- 20 February 1992
- journal article
- research article
- Published by Optica Publishing Group in Applied Optics
- Vol. 31 (6) , 757-764
- https://doi.org/10.1364/ao.31.000757
Abstract
Contradirectional propagation through active, first-order, almost-periodic, corrugated waveguide gratings is analyzed by using both coupled-mode theory and a combined effective-index/impedance-matching matrix technique. For TE-mode operation, which is near the first-order Bragg wavelength, the equivalence of the two techniques is analytically demonstrated for shallow surface corrugations.Keywords
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