1993
DOI: 10.1109/58.248227
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Suppression of sidelobe levels for guided-wave acousto-optic tunable filters using weighted coupling

Abstract: An analysis of guided-wave acousto-optic tunable filters (AOTFs) that employ simple acousto-optic (AO) weighted coupling techniques for sidelobe reduction and the calculated and experimental results from a specific example that involves only variation of the width of a surface acoustic wave (SAW) slot waveguide are presented. The calculations on single- and multi-stage AOTFs consisting of an optical channel waveguide and a SAW slot waveguide in LiNbO(3) substrate show that waveguide width weighting using gener… Show more

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Cited by 15 publications
(4 citation statements)
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“…A significant reduction in the sidelobe levels of the single-stage IAOTFs can be accomplished using the techniques of weighted coupling, facilitated, for example, by tapering the width of the SAW waveguide (48), by focused SAW (49) and uniform gap SAW directional coupling (50). Weighted coupling using tapered-gap SAW directional coupling (51) was also proposed to achieve an even lower sidelobe level.…”
Section: Guided-wave Collinear Acousto-optic Mode Conversionmentioning
confidence: 99%
“…A significant reduction in the sidelobe levels of the single-stage IAOTFs can be accomplished using the techniques of weighted coupling, facilitated, for example, by tapering the width of the SAW waveguide (48), by focused SAW (49) and uniform gap SAW directional coupling (50). Weighted coupling using tapered-gap SAW directional coupling (51) was also proposed to achieve an even lower sidelobe level.…”
Section: Guided-wave Collinear Acousto-optic Mode Conversionmentioning
confidence: 99%
“…Weighted coupling for acousto-optical mode converters has been demonstrated by exciting focused SAW's by specially matched transducer electrodes [ 131, [ 151, with acoustical waveguides of varying widths [14], or with acoustical directional couplers [ll], [12]. The latter structure uses a sinusoidal weighting of the coupling strength achieved with a directional coupler structure with constant gap.…”
Section: -8724/95$04mentioning
confidence: 99%
“…Acousto-optical mode conversion with weighted coupling has been treated theoretically by using matrix formalism in [14]-[16], [26]. The authors assumed a locally varying coupling coefficient along the interaction length but neglected effects related to different phase-matching conditions if several acoustic modes are involved.…”
Section: A Theoretical Modelmentioning
confidence: 99%
“…However, the high sidelobes in the transmission spectra of the converter renders it less suitable for the dense WDM networks. Several proposals [2][3][4] had been used to suppress the sidelobes, but the complicated fabrication techniques limit their applications. Quasi-collinear acoustooptical interaction [5] not only simplifies the structure configuration and fabrication technique, but also demonstrates the good performance of sidelobe suppression.…”
Section: Introductionmentioning
confidence: 99%