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Electrical and Computer Engineering

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Florida Institute of Technology

Electrical Engineering and Computer Science Faculty Publications

2010

Articles 1 - 7 of 7

Full-Text Articles in Engineering

Cad Simulated And Experimental Beam Profile Analysis Of Single-Mode Tapered Fibers For Optical Bandwidth Enhancement Applications, Syed H. Murshid, Raka Biswas, Abhijit Chakravarty May 2010

Cad Simulated And Experimental Beam Profile Analysis Of Single-Mode Tapered Fibers For Optical Bandwidth Enhancement Applications, Syed H. Murshid, Raka Biswas, Abhijit Chakravarty

Electrical Engineering and Computer Science Faculty Publications

Most developments in data transfer techniques are incremental by nature and the goal of increasing total capacity in optical communications and networking requires new concepts for basic transmission media. The transmission data rates can only be enhanced by introducing new modulation and multiplexing techniques. In this paper different single mode tapered fiber waveguides are used to design a Spatial Multiplexer Unit (SMU) for a novel optical fiber multiplexing technique called the Spatial Domain Multiplexing (SDM) that allows co-propagation of two or more channels of exactly same wavelength without interfering with each other. This paper also presents a CAD model for …

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Novel Wavelength Diversity Technique For High-Speed Atmospheric Turbulence Compensation, William W. Arrasmith, Sean F. Sullivan May 2010

Novel Wavelength Diversity Technique For High-Speed Atmospheric Turbulence Compensation, William W. Arrasmith, Sean F. Sullivan

Electrical Engineering and Computer Science Faculty Publications

The defense, intelligence, and homeland security communities are driving a need for software dominant, real-time or near-real time atmospheric turbulence compensated imagery. The development of parallel processing capabilities are finding application in diverse areas including image processing, target tracking, pattern recognition, and image fusion to name a few. A novel approach to the computationally intensive case of software dominant optical and near infrared imaging through atmospheric turbulence is addressed in this paper. Previously, the somewhat conventional wavelength diversity method has been used to compensate for atmospheric turbulence with great success. We apply a new correlation based approach to the wavelength …

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Sdm Propagation Model For Multiple Channels Using Ray Theory, Syed H. Murshid, Ebad Zahir, Abhijit Chakravarty Apr 2010

Sdm Propagation Model For Multiple Channels Using Ray Theory, Syed H. Murshid, Ebad Zahir, Abhijit Chakravarty

Electrical Engineering and Computer Science Faculty Publications

Spatial Domain Multiplexing (SDM) is a novel optical fiber multiplexing technique where multiple channels of the same wavelength are launched at specific angles inside a standard step index multimode carrier fiber. These channels are confined to specific locations inside the fiber and they do not interfere with each other while traversing the length of the fiber. Spatial filtering techniques are employed at the output end to separate, route and process the individual channels. These skew ray channels inside the SDM system follow a helical trajectory along the fiber. The screen projection of the skew rays resembles a circular polygon. A …

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Denoising Of X-Ray Imagery With Spatially-Varying Estimates Of Noise Variance, Samuel Peter Kozaitis Apr 2010

Denoising Of X-Ray Imagery With Spatially-Varying Estimates Of Noise Variance, Samuel Peter Kozaitis

Electrical Engineering and Computer Science Faculty Publications

We described a way to use a block-matching 3-D denoising algorithm to reduce noise in x-ray imagery. We first filtered an image multiple times using different estimates of the noise variance. From a simple estimate of the denoised image, we then estimated the noise variance at each pixel of the image. Using this approach, we obtained improved results when compared to using a single value of estimate for the noise variance. Even a small number of quantization levels of the estimates of the noise showed improved results.

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Sdm Propagation Model For Multiple Channels Using Electromagnetic Theory And Vortex Analysis, Syed H. Murshid, Ebad Zahir, Raka Biswas, Abhijit Chakravarty Apr 2010

Sdm Propagation Model For Multiple Channels Using Electromagnetic Theory And Vortex Analysis, Syed H. Murshid, Ebad Zahir, Raka Biswas, Abhijit Chakravarty

Electrical Engineering and Computer Science Faculty Publications

Spatial Domain Multiplexing (SDM) is a novel technique in optical fiber communications. Single mode fibers are used to launch Gaussian beams of the same wavelength into a multimode step index fiber at specific angles. Based on the launch angle, the channel follows a helical path. The helical trajectory is explained with the help of vortex theory. The electromagnetic wave based vortex formation and propagation is mathematically modeled for multiple channels and the results are compared against experimental and simulated data. The modeled output intensity is analyzed to show a relationship between launch angle and the electric field intensity.

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Comparison Of Experimental And Mathematical Models Of Attenuation And Dispersion For Co-Propagating Helical Channels Of Same Wavelength In Optical Fibers, Syed H. Murshid, Abhijit Chakravarty Apr 2010

Comparison Of Experimental And Mathematical Models Of Attenuation And Dispersion For Co-Propagating Helical Channels Of Same Wavelength In Optical Fibers, Syed H. Murshid, Abhijit Chakravarty

Electrical Engineering and Computer Science Faculty Publications

Spatial reuse of optical frequencies in optical fibers is possible through a novel Spatial Domain Multiplexing (SDM) technique that enables simultaneous propagation of two or more spatially multiplexed channels of exactly the same wavelength by confining them to unique spatial locations inside the fiber. Spatial filtering techniques are employed at the output end to separate the individual optical channels. The SDM channels follow helical path inside the carrier fiber and do not interfere with each other. This paper presents electromagnetic wave based model to analyze two such co-propagating SDM channels and then compares the model predictions to experimental data. The …

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A Crisis Management Approach To Mission Survivability In Computational Multi-Agent Systems, Marco Carvalho, Aleksander Byrski, Marek Kisiel-Dorohinicki Jan 2010

A Crisis Management Approach To Mission Survivability In Computational Multi-Agent Systems, Marco Carvalho, Aleksander Byrski, Marek Kisiel-Dorohinicki

Electrical Engineering and Computer Science Faculty Publications

In this paper we present a biologically-inspired approach for mission survivability (consideredas the capability of fulfilling a task such as computation) that allows the system to be aware ofthe possible threats or crises that may arise. This approach uses the notion of resources usedby living organisms to control their populations.We present the concept of energetic selectionin agent-based evolutionary systems as well as the means to manipulate the configuration ofthe computation according to the crises or user’s specific demands.

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