Abstract
A modulator is reported in which an extensional acoustic wave is launched
along a fiber Bragg grating. The acousto-optic superlattice effect causes
an enhancement in reflectivity within a narrow spectral region on both sides
of the Bragg wavelength. For a fixed acoustic propagation direction, the Doppler
shift can be either positive or negative, depending on whether the wavelength
of the incident light lies above or below the Bragg condition. The device
can function as a Bragg cell and a tunable filter.
© 1997 Optical Society of America
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