Synchronization of Chaotic Optoelectronic Oscillators: Adaptive Techniques and the Design of Optimal Networks

Simple item page
dc.contributor.advisorRoy, Rajarshien_US
dc.contributor.authorRavoori, Bhargavaen_US
dc.contributor.departmentPhysicsen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2011-10-08T05:58:10Z
dc.date.available2011-10-08T05:58:10Z
dc.date.issued2011en_US
dc.description.abstractSynchronization in networks of chaotic systems is an interesting phenomenon with potential applications to sensing, parameter estimation and communications. Synchronization of chaos, in addition to being influenced by the dynamical nature of the constituent network units, is critically dependent upon the maintenance of a proper coupling between the systems. In practical situations, however, synchronization in chaotic networks is negatively affected by perturbations in the coupling channels. Here, using a fiber-optic network of chaotic optoelectronic oscillators, we experimentally demonstrate an adaptive algorithm that maintains global network synchrony even when the coupling strengths are unknown and time-varying. Our adaptive algorithm operates by generating real-time estimates of the coupling perturbations which are subsequently used to suitably adjust internal node parameters in order to compensate for external disturbances. In our work, we also examine the influence of network configuration on synchronization. Through measurements of the convergence rate to synchronization in networks of optoelectronic systems, we show that having more network links does not necessarily imply faster or better synchronization as is generally thought. We find that the convergence rate is maximized for certain network configurations, called <italic>optimal</italic> networks, which are identified based on the eigenvalues of the coupling matrix. Further, based on an analysis of the eigenvectors of the coupling matrix, we introduce a classification system that categorizes networks according to their sensitivity to coupling perturbations as <italic>sensitive</italic> and <italic>nonsensitive</italic> configurations. Though our experiments are performed on networks consisting of specific nonlinear optoelectronic oscillators, the theoretical basis of our studies is general and consequently many of our results are applicable to networks of arbitrary dynamical oscillators.en_US
dc.identifier.urihttp://hdl.handle.net/1903/11951
dc.subject.pqcontrolledPhysicsen_US
dc.subject.pqcontrolledOpticsen_US
dc.subject.pqcontrolledElectrical engineeringen_US
dc.subject.pquncontrolledAdaptive Networksen_US
dc.subject.pquncontrolledChaosen_US
dc.subject.pquncontrolledOptimal Networksen_US
dc.subject.pquncontrolledOptoelectronicsen_US
dc.subject.pquncontrolledSynchronizationen_US
dc.titleSynchronization of Chaotic Optoelectronic Oscillators: Adaptive Techniques and the Design of Optimal Networksen_US
dc.typeDissertationen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Ravoori_umd_0117E_12508.pdf
Size:
7.06 MB
Format:
Adobe Portable Document Format
Download

Collections

UMD Theses and Dissertations
Physics Theses and Dissertations