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Passband Engineering of Acousto-Optic Filters

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Abstract

The acousto-optic filter (AOTF) or switch has unique features which make it a valuable tool for optical wavelength selection. In particular, the ability to select several wavelengths simultaneously suggests that the AOTF may be used as the basis for a tunable wavelength routing switch. However, passbands of existing filters are not as flat as desired for applications requiring the use of several concatenated filters or where the wavelength to be switched is not well defined. In this paper we describe variant filter designs which provide substantially flattened passbands at modest cost in power and length and which can be implemented using extensions of known techniques. One of these designs has been tested experimentally and is shown to perform as simulations lead us to expect.

© 1995 Optical Society of America

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