The superposition of a long-period grating and a fiber Bragg grating, which we call an optical superlattice, causes high-efficiency narrow-band reflections to be induced on either side of the Bragg wavelength. This effect was recently observed experimentally in a fiber-based acousto-optic superlattice modulator. We develop in detail the theory of optical superlattices in fiber Bragg gratings, treating both the acousto-optic and the fixed-grating cases. Applications include reconfigurable wavelength division multiplexers, fiber lasers and sensors, tunable filters, modulators, and frequency shifters.
© 2000 Optical Society of America
P. St. J. Russell and W.-F. Liu, "Acousto-optic superlattice modulation in fiber Bragg gratings," J. Opt. Soc. Am. A 17, 1421-1429 (2000)