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Analysis of the Acoustical Directional Couplers with Constant Gap

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The propagation properties of acoustical directional coupler of constant gap are studied. Three interesting results are obtained: (1) Even modes and odd modes phase velocities propagating in acoustical directional coupler with constant gap, respectively, as functions of acoustical waveguide width and acoustical directional coupler gap, at the frequency of the surface acoustic wave (SAW) fac = 170 MHz and acoustical waveguide width w = 110 m. (2) Coupling coefficient of acoustical directional coupler with constant gap, as a function of acoustical waveguide width and acoustical directional coupler gap, at fac = 170 MHz and acoustical waveguide width w = 110 m waveguide width. (3) Coupling length dependence of gap, of acoustical directional coupler with constant gap, and good agreement between simulation and experiment is achieved. These conclusions are useful for the design of tapered acoustical directional coupler for acousto-optical interaction devices for wavelength division multiplexer (WDM).
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Document Type: Research Article

Publication date: March 1, 2004

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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