Abstract: In this work the modeling of non collinear acoustooptic multifrequency interaction in wave- guiding structures is presented. The new model, which is based on the generalized coupled mode theory, allows us to evaluate the diffraction efficiency in Bragg regime when a multifrequency signal is applied to the interdigitated transducer deposited on the optical waveguide surface. The dependence of diffraction efficiency of the output orders on the intermodulation factors and on the transducer driving radiofrequencies has been investigated. The influence of fabrication parameters of Ti:LiNbO$-3$/ waveguides on the linear dynamic range of acoustooptic multifrequency modulators has been extensively studied under monomodal propagation condition. Our results assert that the best performance in terms of linear dynamic range ($APEQ 43 dB) can be obtained on Ti:LiNbO$-3$/ waveguides having weak refractive index change ($Delta@n $LS 0.001), small initial titanium thickness ($LS 100 angstroms) and medium enter radiofrequency ($APEQ 500 MHz).!19
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机译：摘要：在这项工作中，提出了波导结构中非共线声光多频相互作用的建模。基于广义耦合模式理论的新模型使我们能够在将多频信号施加到沉积在光波导表面上的叉指式换能器时评估布拉格状态下的衍射效率。已经研究了输出阶次的衍射效率对互调因子和换能器驱动射频的依赖性。在单峰传播条件下，已经广泛研究了Ti：LiNbO $ -3 $ /波导的制造参数对声光多频调制器线性动态范围的影响。我们的研究结果表明，在折射率变化较弱（$ Delta @ n $ LS 0.001），初始钛较小的Ti：LiNbO $ -3 $ /波导上，可以获得线性动态范围（$ APEQ 43 dB）的最佳性能。厚度（$ LS 100埃）和中等输入射频（$ APEQ 500 MHz）。！19
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