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dc.contributor.authorRontani, Damienen_US
dc.date.accessioned2012-02-17T19:20:31Z
dc.date.available2012-02-17T19:20:31Z
dc.date.issued2011-10-20en_US
dc.identifier.urihttp://hdl.handle.net/1853/42810
dc.description.abstractWith the rapid development of optical communications and the increasing amount of data exchanged, it has become utterly important to provide effective ar- chitectures to protect sensitive data. The use of chaotic optoelectronic devices has already demonstrated great potential in terms of additional computational security at the physical layer of the optical network. However, the determination of the security level and the lack of a multi-user framework are two hurdles which have prevented their deployment on a large scale. In this thesis, we propose to address these two issues. First, we investigate the security of a widely used chaotic generator, the external cavity semiconductor laser (ECSL). This is a time-delay system known for providing complex and high-dimensional chaos, but with a low level of security regarding the identification of its most critical parameter, the time delay. We perform a detailed analysis of the influence of the ECSL parameters to devise how higher levels of security can be achieved and provide a physical interpretation of their origin. Second, we devise new architectures to multiplex optical chaotic signals and realize multi-user communications at high bit rates. We propose two different approaches exploiting known chaotic optoelectronic devices. The first one uses mutually cou- pled ECSL and extends typical chaos-based encryption strategies, such as chaos-shift keying (CSK) and chaos modulation (CMo). The second one uses an electro-optical oscillator (EOO) with multiple delayed feedback loops and aims first at transpos- ing coded-division multiple access (CDMA) and then at developing novel strategies of encryption and decryption, when the time-delays of each feedback loop are time- dependent.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectCommunicationen_US
dc.subjectChaosen_US
dc.subjectNonlinear dynamicsen_US
dc.subjectSynchronizationen_US
dc.subjectTime-delay systemsen_US
dc.subjectOptoelectronic devicesen_US
dc.subjectMultiplexingen_US
dc.subjectPhysical layer securityen_US
dc.subject.lcshOptical communications
dc.subject.lcshComputer security
dc.subject.lcshChaotic behavior in systems
dc.titleCommunications with chaotic optoelectronic systems - cryptography and multiplexingen_US
dc.typeDissertationen_US
dc.description.degreePhDen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.advisorCommittee Chair: Prof. David Citrin; Committee Co-Chair: Prof. Marc Sciamanna; Committee Member: Dr. Alexandre Locquet; Committee Member: Prof. Erik Verriest; Committee Member: Prof. Kurt Wiesenfeld; Committee Member: Prof. Steven W. McLaughlin; Committee Member: Prof. William T. Rhodesen_US


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