Title:
Chaotic optical communications using delayed feedback systems

dc.contributor.advisor Citrin, David S.
dc.contributor.author Locquet, Alexandre Daniel en_US
dc.contributor.committeeMember Bertrand Boussert
dc.contributor.committeeMember Williams, Douglas B.
dc.contributor.committeeMember Rhodes, William T.
dc.contributor.committeeMember Yves Berthelot
dc.contributor.department Electrical and Computer Engineering en_US
dc.date.accessioned 2006-06-09T17:50:44Z
dc.date.available 2006-06-09T17:50:44Z
dc.date.issued 2006-01-11 en_US
dc.description.abstract Chaotic dynamics produced by optical delay systems have interesting applications in telecommunications. Optical chaos can be used to transmit secretly, in real-time, a message between an emitter and a receiver. The noise-like appearance of chaos is used to conceal the message, and the synchronization of the receiver with the chaotic emitter is used to decode the message. This work focuses on the study of two crucial topics in the field of chaotic optical communications. The first topic is the synchronization of chaotic external-cavity laser diodes, which are among the most promising chaotic emitters for secure communications. It is shown that, for edge-emitting lasers, two drastically different synchronization regimes are possible. The regimes differ in terms of the delay time in the synchronization and in terms of the robustness of the synchronization with respect to parameter mismatches between the emitter and the receiver. In vertical-cavity surface-emitting lasers, the two linearly-polarized components of the electric field also exhibit isochronous and anticipating synchronization when the coupling between the lasers is isotropic. When the coupling is polarized, the linearly-polarized component that is parallel to the injected polarization tends to synchronize isochronously with the injected optical field, while the other component tends to be suppressed, but it can also be antisynchronized. The second topic is the analysis of time series produced by optical chaotic emitters subjected to a delayed feedback. First, we verify with experimental data that chaos produced by optical delay systems is highly complex. This high complexity is demonstrated by estimating chaos dimension and entropy from experimental time series and from models of optical delay systems. Second, by analyzing chaotic time series, it is shown that the value of the delay of a single-delay system can always be identified, independently of the type of system used and of its complexity. Unfortunately, an eavesdropper can use this information on the delay value to break the cryptosystem. We propose a new cryptosystem with two delayed feedback loops that increases the difficulty of the delay identification problem. en_US
dc.description.degree Ph.D. en_US
dc.format.extent 43994771 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/10431
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Dimension en_US
dc.subject Entropy
dc.subject Delay identification
dc.subject Time series analysis
dc.subject Synchronization
dc.subject LFF
dc.subject Coherence collapse
dc.subject Anticipating synchronization
dc.subject Isochronous synchronization
dc.subject Polarization dynamics
dc.subject Lyapunov exponents
dc.subject Cryptography
dc.subject Delay systems
dc.subject Optical chaos
dc.subject Chaos
dc.title Chaotic optical communications using delayed feedback systems en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Citrin, David S.
local.contributor.corporatename School of Electrical and Computer Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 33be0387-8194-481b-a8f8-fa4fb33af72b
relation.isOrgUnitOfPublication 5b7adef2-447c-4270-b9fc-846bd76f80f2
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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