View All Items
(1 - 2 of 2)
- Title
- STABLE SPATIAL SOLITONS IN SEMICONDUCTOROPTICAL AMPLIFIERS.
- Creator
-
ultanir, erdem ahmet, Stegeman, George I., University of Central Florida
- Abstract / Description
-
A spatial soliton is a shape invariant self guided beam of light or a self induced waveguide.Spatial solitons appear as a result of the balance of diffraction and nonlinear focusing in asystem. They have been observed in many different conservative media in the last couple ofyears. Solitons are ubiquitous, because of the probability of using their interactions in opticaldata processing, communications etc. Up to now due to the power required to generate thesolitons, and the response times of...
Show moreA spatial soliton is a shape invariant self guided beam of light or a self induced waveguide.Spatial solitons appear as a result of the balance of diffraction and nonlinear focusing in asystem. They have been observed in many different conservative media in the last couple ofyears. Solitons are ubiquitous, because of the probability of using their interactions in opticaldata processing, communications etc. Up to now due to the power required to generate thesolitons, and the response times of the soliton supporting media, these special waves of naturecould not penetrate the applications arena. Semiconductors, with their resonant nonlinearities, arethought to be ideal candidates for fast switching, low power spatial solitons.In this dissertation it is shown theoretically and experimentally that it is possible toobserve stable spatial solitons in a periodically patterned semiconductor optical amplifier(PPSOA). The solitons have unique beam profiles that change only with system parameters, likepumping current, etc. Their coherent and incoherent interactions which could lead to all opticaldevices have been investigated experimentally and theoretically. The formation of filaments ormodulational instability has been studied theoretically and yielded analytical formulae forevaluating the filament gain and the maximum spatial frequencies in PPSOA devices.Furthermore, discrete array amplifiers have been analyzed numerically for discrete solitons, andthe prospect of using multi peak discrete solitons as laser amplifiers is discussed.
Show less - Date Issued
- 2004
- Identifier
- CFE0000142, ucf:46153
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0000142
- Title
- Pervasive Secure Content Delivery Networks Implementation.
- Creator
-
Lugo-Cordero, Hector, Guha, Ratan, Stanley, Kenneth, Chatterjee, Mainak, Wu, Annie, Lu, Kejie, University of Central Florida
- Abstract / Description
-
Over the years, communication networks have been shifting their focus from providing connectivity in a client/server model to providing a service or content. This shift has led to topic areas like Service-Oriented Architecture (SOA), Heterogeneous Wireless Mesh Networks, and Ubiquitous Computing. Furthermore, probably the broadest of these areas which embarks all is the Internet of Things (IoT). The IoT is defined as an Internet where all physical entities (e.g., vehicles, appliances, smart...
Show moreOver the years, communication networks have been shifting their focus from providing connectivity in a client/server model to providing a service or content. This shift has led to topic areas like Service-Oriented Architecture (SOA), Heterogeneous Wireless Mesh Networks, and Ubiquitous Computing. Furthermore, probably the broadest of these areas which embarks all is the Internet of Things (IoT). The IoT is defined as an Internet where all physical entities (e.g., vehicles, appliances, smart phones, smart homes, computers, etc.), which we interact daily are connected and exchanging data among themselves and users. The IoT has become a global goal for companies, researchers, and users alike due to its different implementation and functional benefits: performance efficiency, coverage, economic and health. Due to the variety of devices which connect to it, it is expected that the IoT is composed of multiple technologies interacting together, to deliver a service. This technologies interactions renders an important challenge that must be overcome: how to communicate these technologies effectively and securely? The answer to this question is vital for a successful deployment of IoT and achievement of all the potential benefits that the IoT promises.This thesis proposes a SOA approach at the Network Layer to be able to integrate all technologies involved, in a transparent manner. The proposed set of solutions is composed of primarily the secure implementation of a unifying routing algorithm and a layered messaging model to standardizecommunication of all devices. Security is targeted to address the three main security concerns (i.e., confidentiality, integrity, and availability), with pervasive schemes that can be employed for any kind of device on the client, backbone, and server side. The implementation of such schemes is achieved by standard current security mechanisms (e.g., encryption), in combination with novel context and intelligent checks that detect compromised devices. Moreover, a decentralized content processing design is presented. In such design, content processing is handled at the client side, allowing server machines to serve more content, while being more reliable and capable of processing complete security checks on data and client integrity.
Show less - Date Issued
- 2017
- Identifier
- CFE0006620, ucf:51268
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0006620
