Underwater Free Space Optics

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dc.contributor.advisor Dr. John F. Muth, Committee Chair en_US
dc.contributor.advisor Dr. Leda M. Lunardi, Committee Co-Chair en_US
dc.contributor.advisor Dr. Kevin G. Gard, Committee Member en_US
dc.contributor.author Gawdi, Yash Jagdishlal en_US
dc.date.accessioned 2010-04-02T18:09:37Z
dc.date.available 2010-04-02T18:09:37Z
dc.date.issued 2006-12-08 en_US
dc.identifier.other etd-10242006-101039 en_US
dc.identifier.uri http://www.lib.ncsu.edu/resolver/1840.16/2018
dc.description.abstract Radio waves propagate poorly in water and acoustics have been the dominant method for undersea communications, but its data rates are bandwidth limited. Free Space Optics potentially provides an alternative solution to acoustical communications with wider bandwidth and wireless flexibility that would benefit many undersea applications over short ranges. Compared to atmospheric propagation, ocean waters are a more complex medium for light propagation presenting a very high attenuation, depending on a variety of different parameters and conditions. In this work, a model is investigated to that estimates the total attenuation of the light propagation in natural waters in the context of optical communications. Using a one parameter model of absorption and scattering, a general framework has been structured in MathCAD, where the absorption and scattering coefficients are iteratively calculated for a variable vertical chlorophyll profile. The beam spread function is implemented to estimate the total beam attenuation. Link budget simulations are also computed to address the feasibility of the underwater free space optical links. Laboratory experiments of light attenuation in sea water with red (633nm) and green (532nm) wavelengths corroborate simulated results obtained with the beam spread function within 25% error margin. Particulate scattering experiments with polystyrene latex spheres of sizes 500nm and 6μm were carried out to confirm its dependence on wavelength and particle size. These phase function of the measured experimental results are in agreement with the previously published data. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject Particulate scattering en_US
dc.subject Chlorophyll distribution profile en_US
dc.subject Beam spread function en_US
dc.subject Underwater communication en_US
dc.subject Free Space Optics en_US
dc.subject Optical link budget en_US
dc.title Underwater Free Space Optics en_US
dc.degree.name MS en_US
dc.degree.level thesis en_US
dc.degree.discipline Electrical Engineering en_US

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