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Study of Variable MUX/DEMUX for DWDM Applications in Optical Communications using Thin Film Magnetooptic Materials
AuthorCoisson, David Joseph
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This study has investigated thin film magnetooptic variable MUX/DEMUX for DWDM optical communications. Several items were studied to include: total diffraction angles achieved with magneto-optic ferrite thin films in a two dimensional multi stage array configuration; three dimensional analysis of thin films for variable MUX/DEMUX applications; and material losses of the thin films. Previous research shows that using ferrite thin films with an applied longitudinal magnetic field results in higher total diffraction angles. However, larger total diffraction angles are achieved by using an array of magneto-optic ferrite thin films. The analysis provided in this study shows that using magnetooptic thin film materials with various concentrations of gold nano particle dopants as the mediums for each stage increases the total diffraction angle of the optical beam. This dissertation looks into the three dimensional effects of the thin films on the optical signals. Effects examined are cross product results of the incident vector and the applied magnetic field. This dissertation shows that when the incident vector is in the XY plane and the applied magnetic fields are in different XZ or XY planes, the resulting cross product yields vectors in all XYZ directions. Additionally, this study analyzed the optical beam spreading to see if any channels overlap with one another. Numerical analysis of the optical beam diffraction angles is shown. The diffraction angle (beam spreading) was in the order of 10-9 degrees. Thus, using laws of triangles with a channel spacing of 0.01 nanometers (nm), one would start to see the channels overlap approximately 1 meter after the signals traverse the thin film material. Considering the Multiplexer (MUX)/Demultiplexer (DEMUX) devices are in micrometer dimensions, this shows that channel overlapping is not an issue at all. Lastly, this dissertation investigates the losses associated with ferrite thin films with various gold nanoparticles concentrations, to see if they are suitable for use as a MUX/DEMUX in Wide Area Network (WAN) optical communications. This dissertation has studied the boundary condition of HE11 and LP01 modes, Absorption Losses, and the transmittance of the thin films. The propagation constant and the Power Mode have been analyzed and are found quite promising for use in the desired application. The Absorption Losses are associated with the resistance of the thin films and their effect on the current drop in the thin films. The absorption coefficients are high due to the properties of the thin films. However, due to the thickness of the thin films their effect is minimal. The calculated output power of optical signals propagating through the thin films ranges from 9.9 to 9.98 mW with an input power of 10 mW. The transmittance is used to determine how much power of the optical source propagates through the thin films. The transmittance of the thin films was found to be ranging from 37 to 82 percent for parallel components of the waves and 42 to 82 percent for perpendicular components of the waves, which is suitable for optical communications.