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Fiber-optic frequency shifter with no mode change using cascaded acousto-optic interaction regions

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Abstract

A new method for performing frequency shifting in two-mode elliptical-core optical fibers is described. We report the use of cascaded acousto-optic interaction regions in analogy with techniques already used in LiNbO3 technology. The interaction region is divided in two. The first section consists of a contradirectional acoustic flexural wave, and the second section consists of a codirectional acoustic flexural wave. With this scheme, a frequency shifter has been built that maintains the light in the fundamental mode of the optical fiber. Experimentally, we have obtained carrier and spurious sideband suppression of better than 40 dB.

© 1990 Optical Society of America

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