Accession Number : ADP008109

Title :   Low-Sidelobe Integrated Acoustooptic Tunable Filter Using Focused Surface Acoustic,

Corporate Author : CALIFORNIA UNIV IRVINE

Personal Author(s) : Roy, A. K. ; Tsai, C. S.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : Integrated acoustooptic tunable filters (AOTFs) have been shown to have potential applications in optical wavelength-division-multiplexed systems. The single-stage integrated AOTFs reported previously all use uniform coupling between the surface acoustic waves (SAWs) and guided-optical waves throughout the interaction length, resulting in best filter sidelobe levels of up to -9dB. It was recently suggested that the replacement of uniform-coupling with weighted-coupling would result in significant reduction of the sidelobe levels of the filter. In the weighted-coupling schemes, the coupling constant, Kappa, of the collinear AO interaction for mode conversion varies along the interaction length. Higher values of Kappa in the middle region of the interaction length with appropriate tapering of Kappa values in its end regions would result in significantly lower sidelobe levels.

Descriptors :   *ACOUSTOOPTICS, *SIDELOBES, *SURFACE ACOUSTIC WAVES, *OPTICAL WAVEGUIDES, *SYMPOSIA, WAVES, COUPLINGS, MULTIPLEXING.

Subject Categories : Fiber Optics and Integrated Optics
      Line, Surface and Bulk Acoustic Wave Devices
      Acoustooptic and Optoacoustic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE