Abstract
The cladding modes of a tilted fiber grating can be coupled back to the core modes by acoustooptic
interactions. However, the coupling of high-order diffractions by acoustic–optic interaction is not apparent,
owing to the insufficiency of acoustic power. In this paper, we will demonstrate that as two acoustic flexural waves
with appropriate frequency are launched to a tilted fiber Bragg grating, high-order harmonic acoustic waves can be
superposed to improve the coupling efficiency between the backward cladding modes and core modes. This phenomenon
may be applied to induce several optical channels for multichannel laser and wavelength-division multiplexing
filters.
© 2007 IEEE
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