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 57 for “"Optical access"”.
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On greening optical access networks
… concern, reducing energy consumption of optical access networks has become an important issue for network designers. In Ethernet passive optical network (EPON), the optical line terminal (OLT) located at the central office broadcasts the downstream traffic to all optical network units …
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Future Extensions to Passive Optical Access Networks
… in metropolitan regions require high density access networks to meet the growing need for bandwidth that results. Furthermore, new services such as high definition TV, online gaming and real-time video teleconferencing are becoming increasingly popular among consumers. These services require …
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Optimizing resource allocation in next-generation optical access networks
… of bandwidth-demanding applications, Passive Optical Networks (PONs) exploit the potential capacities of optical fibers, and are becoming promising future-proof access network technologies. On the other hand, for a broader coverage area and higher data rate, integrated optical and wireless …
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SOA enhanced optical line terminal for future optical access network
Future passive optical networks (PONs) aim to deliver data rates of 100 Gb/s per wavelength using intensity-modulation direct detection (IM/DD) and up to 400 Gb/s per wavelength using coherent technology. Achieving these targets requires overcoming the large dynamic range of burst-mode upstream …
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Piston fuel film observations in an optical access GDI engine
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2000.
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Experimental investigation on turbulent flow overlying permeable walls
… the free flow and the pore flow take place. Accessing this region either experimentally or computationally is extremely challenging, with the latter limited by direct physical of optical access near and within the bed. The goal of this study was to explore the role of wall permeability and …
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Progress towards strong coupling between collisionally blockaded atoms and an optical cavity
… of a relatively long (14mm) cavity grants good optical access, permitting the implementation of a dipole trap centered on the cavity, and small enough to capture only a single atom in the collisional blockade regime.
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An FPGA implementation of a sleep enabled PON system
… video-on-demand applications, Passive Optical Network (PON) has been widely considered as one of the most promising solutions for broadband access. Environmental concerns motivated network designers to lower energy consumption of optical access networks. A well-known approach to reduce …
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Custom built atomic force microscope for nitrogen-vacancy diamond magnetometry
… is described. A custom AFM was built that allows optical monitoring of the cantilever tip and collection of fluorescence with a high-NA objective from the same side. The AFM has a large open bottom and top and thus provides dual optical access. The motion of the cantilever is measured by optical …
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Assessing the performance and reliability of GaN based electronics via optical and electrical methods
… measurement and sometimes may be limited by its optical access. Furthermore, the ability to monitor the transient temperature rise under pulsed conditions has not been yet fully developed. This thesis presents advanced methods for in-situ transient temperature measurements, using gate resistance …
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A next-generation apparatus for lithium optical lattice experiments
… model, using ultracold Lithium atoms in an optical lattice. A major goal of the quantum simulation program is to observe phase transitions of the Hubbard model, into Néel antiferromagnetic phases and d-wave superfluid phases. Phase transitions are generally accompanied by a change in an …
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Sound-induced micromechanical motions in an isolated cochlea preparation
… one half of the apical turn is removed to allow optical imaging with a 40x, 0.8 NA water-immersion objective. Reissner's membrane is left intact. Illumination is provided with a blue LED coupled to an optical fiber. The fiber is positioned next to the bone surrounding scala tympani of the apical …
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Developing a Functional in Vitro Model of the Neuromuscular Interface
… while providing compartmentalization and clear optical access for live imaging of muscle and motor neuron co-cultures. This work therefore presents STAMP, a microgroove patterning method for creating aligned, more physiologically relevant, functional, and optically accessible skeletal muscle …
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Quantum Gas Microscopy of Bosonic Correlations in the Continuum
… site-resolved imaging, providing unprecedented access to quantum statistical effects and many-body phenomena. While such instruments are often employed to study physics in optical lattices, we have innovatively adapted our apparatus to investigate bulk system behavior. A major part of this …
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Design, Analysis, and Testing of Nanoparticle-Infused Thin Film Sensors for Low Skin Friction Applications
… with gaps surrounding that surface, or require optical access for measurements. Conventional direct measurement sensors are also difficult to apply in low shear environments, in the 1-10 Pa range. A new thin, flexible, nanoparticle infused, piezoresistive material called Metal Rubber" was used …
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A comprehensive analysis of natural gas direct injection and of mixture formation in spark ignition engines
… on the developed multi-cylinder engine and on an optical access single-cylinder engine, in order to obtain more detailed knowledge of the DI CNG engine behaviour. The thesis is divided into six chapters. After a short introduction related to the transportation sector environmental impact (Chapter …
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Molecular Plasmonics: Graphene Plasmons in the Picoscale Limit
… a three-electrode electrochemical cell with optical access was designed, where current is passed through a nonaqueous electrolyte solution that contains a known concentration of PAH molecules. In contrast to larger graphene nanostructures, the PAH absorption spectra possess a rich and complex …
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Nonlinear Optical Techniques For Imaging And Manipulating The Mouse Central Nervous System
… of novel multi-photon microscopy (MPM) and optical manipulation techniques as they apply to studies the mouse central nervous system (CNS), with an emphasis on the spinal cord. The scientific findings which have resulted from the implementation of these techniques are also presented. In …
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Burst-mode electronic dispersion compensation in long reach PONs
Long reach passive optical networks (LR-PONs), which integrate fibre-to-the-home with metro networks, have been the subject of intensive research in recent years and are considered one of the most promising candidates for the next generation of optical access networks. Such systems ideally have …
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