Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 72 for “"optical transmission"”.
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Multi-Channel Nonlinear Frequency Division Multiplexed Optical Transmission Systems
… capacity by compensating for fiber losses using optical amplifiers and employing wavelength division multiplexing (WDM). To further increase the achievable data rates, higher optical power is required, for example, to enable the use of more complex modulation formats. However, increasing the …
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Structural characterization and optical transmission studies of vanadate glasses
"Structural characterization and optical transmission studies have been carried out on vanadate glasses based on the system V205-P205 in the range 70.0-87.5 mole % V205 0 The optical studies are compared with other studies of crystalline V205, and additional transmission measurements on V20 S were …
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Multilevel Nyquist-WDM Ultra-Long-Haul Coherent Optical Transmission Systems
… a proper capacity upgrades plan, with new optical links deployment, has required for back-bone optical networks in order to avoid possible networks congestions. Such effect has theoretically forecast as probable in actual networks within next few tenths years, particularly in US if some …
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Polarization Conversion Mediated Surface Plasmon Polaritons in Extraordinary Optical Transmission through a Nanohole Arrays
… seminal work in 1998 observing extraordinary optical transmission (EOT) through nanohole arrays, much research has focused on the role of surface plasmon polaritons (SPPs) in EOT. While the energy and momentum conditions have become clear, no consensus has been reached on the role of incident …
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Optical transmission and emission behavior of subwavelength apertures flanked by periodic structures in gold films
Includes bibliographical references (pages 104-111).
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Optical and mechanical properties of glass fiber and ribbon reinforced poly(methyl methacrylate) composites
<p>"Composites with excellent optical clarity have been fabricated by matching the refractive index of the glass fiber reinforcement to that of the polymer matrix. Refractive index mismatch, resulting from temperature changes, leads to degradation of optical clarity in fiber composites due to light …
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Laser processing of solution based antimony doped tin oxide thin films
… step to achieve the desired electrical and optical properties. This is disadvantageous for applications that would benefit from low cost, low temperature/flexible substrates. As an alternative to conventional high temperature annealing, excimer laser processing can provide highly localized …
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Crosstalk suppression techniques for multi-channel regeneration based on fiber optic parametic amplifier
Optical transmission system is the best choice to transmit high capacity information over long distances. The progressive development in optical transmission technologies allows the growth of transmission speed and capacity.2R or 3R regeneration can refine the degraded signal and improve …
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The study of plasmonics in nanohole metallic metamaterials
… present in metamaterials results in unique optical properties. Nanohole arrays are a metamaterial consisting of an array of sub-wavelength holes perforated in an optically thin metallic film which resides upon a dielectric material. The interaction of light with the surface plasmons present …
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Deposition of electronic and plasmonic materials inside microstructured optical fibres
Optical fibres are the transport medium of today's digital information. Nowadays, modern optical telecommunication systems make use of semiconductor optoelectronic devices to generate, control and detect light. The union of the two technologies, namely fibre photonics and semiconductor electronics …
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Testing and modeling of photo-electric modulators
Optical links are a promising alternative to the electrical interconnects that are currently used between chips within a computer. A crucial part of an optical link is a modulator, a device that converts an electrical signal into an optical signal. This thesis explores the physics of how these …
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Išorinio poveikio įtaka terahercų taikymams telekomunikacijose /
… bandwidth is one of the factors limiting data transmission rate. Current wireless technologies, coupled with the newest 5G technology, is expected to meet only 81 percent of the planned need. One of the promising candidates is the Terahertz (THz) Band (100 GHz – 10 THz), but the THz waves are …
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Impact of external effects on terahertz applications for telecommunications /
… bandwidth is one of the factors limiting data transmission rate. Current wireless technologies, coupled with the newest 5G technology, is expected to meet only 81 percent of the planned need. One of the promising candidates is the Terahertz (THz) Band (100 GHz – 10 THz), but the THz waves are …
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Optical properties of GaAs coupled quantum wells and superlattices: electric and magnetic field effects
… effects of electric and magnetic fields on the optical transmission and reflection spectra of GaAs/ AlGaAs coupled quantum wells and superlattices are investigated and their potential application in optical modulation demonstrated. Quenching and enhancement of excitonic absorption peaks is …
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Multidisciplinary system design optimization of fiber-optic networks within data centers
… (b) maximizing user capacity, and (c) maximizing optical transmission quality (Q-factor). The results demonstrate that data center life-cycle costs are most sensitive to power costs, 10G OM4 multi-mode optical fiber is Pareto optimal for long reach and low user capacity needs, and 100G OM4 …
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RF phase modulation of optical signals and optical/electrical signal processing
Analog RF phase modulation of optical signals has been a topic of interest for many years, mainly focusing on Intensity Modulation Direct Detection (IMDD). The virtues of coherent detection combined with the advantages of Frequency Modulation, however, have not been explored thoroughly. By …
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Development of nanoplasmonic devices for biosensing applications
… and dynamic range for the chosen target. Optical micro- and nanosensors have incredible potential for early stage detection of cancer biomarkers in human serum samples for applications such as treatment monitoring and recurrence diagnosis due to their reliability for measuring …
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Characterization and connectorization of optoelectronic neural probes
… systems. Furthermore, recent advances in optical neural stimulation methods would benefit from seamless integration of optical waveguides into neural probes. In this thesis, we describe electronic and optical characterization of polymer-based probes produced through thermal drawing …
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Optical dosimetry tools and Monte Carlo based methods for applications in image guided optical therapy in the brain
… biological tissue. To accomplish this task, an optical dosimetry probe and Monte Carlo based simulation code were fabricated, calibrated and developed to predict light transport in heterogeneous tissue phantoms of the skull and brain. Empirical model (EM) of photon transport using CT images as …
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Nanoplasmonics and silicon nanophotonics devices for sensing applications
… with manipulation of light using the unique optical properties of metal nanostructures. Manipulation of light in nanoscale using properties of surface plasmon will make it possible to accomplish a myriad of applications ranging from global security to healthcare and environmental sensing. …
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