Download A Novel MEMS Micromirror Optical Switch

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Analysis of Three Dimensional Acoustooptic Cell Array (AOCA) System
John Doe1 and Jean Dupont 2
1
Department of Electrical and Biomedical Engineering, University of
Nevada, U.S.A , 2 COPL, Université Laval, Canada
The acousto-optically tuned devices are becoming quite popular in dense wavelength
division multiplexing (DWDM) applications due to low insertion loss, less cross talk,
tenability for the intensity variation of the deflected beams and are free from the grating
wavelength drift due to thermal variations. Acousto-optic cell diffracts the optical beam
depending on the wavelengths and acoustic frequency. This property is used to exploit
acousto-optic cell array (AOCA) for multiplex/demultiplex (MUX/DEMUX) and crossconnect applications in DWDM in optical communication. Acousto-optic diffraction
grating is preferred over other systems as the directions of the deflected light beams can
be controlled by changing the frequency of the drive signal and the light intensity of the
beams can be adjusted by changing the power of the drive signal. This paper presents the
analysis and performance of three-dimensional arrangement of acousto-optic cell arrays
based on generalized equations. The focus of this paper is to analyze Bragg conditions,
deflection angles, normalized powers and diffraction efficiency at different stages for
different number of cells in each stage. The Bragg angle is obtained by taking vector
cross-product of incident angle resolved into two different planes and rotation angle of
the acoustic wave front. The phase shifts between cells and various stages have been
changed to obtain optimum diffraction efficiency. Numerical results based on generalized
equations have been obtained for optical wavelengths vs deflection angles, incident angle
vs deflection angle in different directions. The wavelengths under consideration range
between 1500-1600 nm and the effects of acoustic wave velocity variations have also
been considered.
various figures.
The visual representations of the deflections are also shown through