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 27 for “"Optical Link"”.
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Analysis and Optimisation of an Organic Optical Link
… are uniquely placed for low-cost integrated optical interconnects. This thesis presents novel high-speed analysis and optimisation of OLEDs for communications purposes. DC and small-signal measurement results for small-molecule OLEDs fabricated by Dr. Kou Yoshida at the University of St. …
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Modeling and performance evaluation of free space optical link for ground-to-train communications
… on-board fast-moving trains. Free Space Optical (FSO) Communications technology promises a bright future for various applications, due to its cost-effectiveness, ease of deployment, and huge unregulated bandwidth, which gives it an edge over contemporary technologies. However, there is a …
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Vertical-cavity surface-emitting laser (VCSEL) for 50Gb/s NRZ optical link in data center
… (VCSELs) at 850 nm have been widely deployed in optical data transmission as the optical transmitters. However, the data transmission capability of commercial VCSELs used in 100 m optical links with direct non-return-to-zero (NRZ) modulation has been limited to 25 Gb/s for years. At the same …
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Investigating the Optical Link Performance of the End-of Substructure Card and Susceptibility to SEUs
… non-ideal operating conditions and the impact of optical link parameters. The first set of tests is centered on qualifying the radiation tolerance of the EoS card. The radiation environment within the ITk poses a threat to the stable operation of electronics as energetic particles have the …
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Development of high-speed P-i-N photodetector for 50Gb/s optical link in data centers
… of communication. The growing dependence on the optical interconnect in data centers results from its superiority over traditional electrical interconnects to transmit data at high speed over long distance. The P-i-N photodiode, having the advantage of high bandwidth and low noise level, plays a …
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Development of InP DHBT for 5G millimeter-wave power amplifier and GaAs photodetector for 50 Gb/s optical link
The high-speed optical transceivers require high-speed photodetector to be paired with high-speed vertical-cavity surface-emitting lasers (VCSELs) for short-range transmission at 850 nm. High-speed photodetector holds the key to higher data rate and lower energy consumption, which can help resolve …
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DYNAMIC ADAPTATION OF BANDWIDTH GRANULARITY FOR MULTIPATH ROUTING IN ELASTIC OPTICAL OFDM-BASED NETWORKS
… consider the impact of spectrum fragmentation in optical single-/multi-path routing transmission on the efficiency of the elastic optical networks. O-OFDM multicarrier transmission is a promising technique that makes it possible to choose just an adequate portion of available spectrum to satisfy …
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MIMO RADIO-OVER-FIBRE DISTRIBUTED ANTENNA SYSTEM FOR NEXT GENERATION WIRELESS COMMUNICATION
… units (RAUs) from the base station via a single optical link. By using the DSB frequency translation, the original single-input-single-output (SISO) DAS can be upgraded into the MIMO DAS without implementing parallel optical links. Experimentally, the DSB frequency translation 2x2 MIMO RoF system …
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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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Investigating thermal dependence on monolithically-integrated photonic interconnects
Monolithically-integrated optical link is a disruptive technology which has the promising potential to remove memory bandwidth bottleneck in the deep multicore regime. Although with the advantages of high bandwidth-density and energy-efficiency, it comes with design challenges from device, …
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Output Characteristics and High-Speed Modulation of Composite -Resonator Vertical -Cavity Lasers
… characteristics, differential slope efficiency, optical spectra, and output polarization. A rate-equation model with two independent carrier populations and a single optical mode is presented and the resulting modulation response is derived. Finally, the experimental high-speed characteristics …
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Optical Performance and Prototyping of a Liquid Lens Laser Communications Transceiver
… radio frequency (RF) systems. Free-space optical communications systems' beams are typically narrower in divergence and require precise pointing, acquisition, and tracking (PAT) systems to establish and maintain links. Several technologies for beam steering exist, including MEMS …
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The radiation physics, mitigation approaches and design guidelines of high-speed connectors and cables analyzed with numerical modeling, analytical formulation and measurements
… the first paper, the radiation from the optical cage connector in the frequency range of 4-28 GHz is analyzed with validated full-wave simulation model and analytical formulas. The radiation from the optical cage connector is suppressed with absorbing materials, and the coupling path in …
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Hardware and software development of a multichannel readout board named CARLOSrx for the ALICE experiment
… coming from the front end electronics through optical link connections, it stores them in a large data FIFO and then it sends them to the DAQ system. Each CARLOSrx is composed by two boards. One is called CARLOSrx data, that reads data coming from the SDD detectors and configures the FEE; the …
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Bidirectional adaptive optics architectures for optical communication through atmospheric turbulence
Free-space optical (FSO) classical communication links can provide high data rates vital for successfully serving the world's exponentially growing demand for bandwidth, while FSO quantum key distribution (QKD) links allow information-theoretic rather than computational secure communication between …
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Data-Driven Physical-Layer Optimization for RF and Optical Communications: Transmitarray Metasurfaces, Contextual-Bandit MUD, and Coherent Optical Links
… third carries the methodology onto a coherent optical link, where size, weight, and power constraints make a small-satellite deployment the natural target.</p> <p>The antenna work targets a tri-layer pixelated unit cell fabricated on Avient ABS550 by fused-deposition modeling, operated from 8 …
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Noise Metrology in Optical Communication Systems
… evolution towards autonomous and plug-and-play optical systems require of research, development and implementation for the requirements of this paradigm shift. This PhD thesis addresses the problem of noise estimation in optical communication systems. This topic is of critical importance since a …
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Linking confined electron spins through coherent light-matter interaction.
… dots are considered as nodes for a coherent optical network capable of supporting distributed quantum states. Through a series of experiments, the work contributing to this dissertation examines some of the key criteria for constructing such a network. First, the ability to optically extract …
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High bandwidth neural interfacing using visible light communication
… was validated by sending neural data through the optical link, using an off the shelf LED. A fully wireless in vivo package was then developed. It was verified with test signals in a simulated environment, and a head fixed mouse at transmission distance of 20 cm. During in vivo recording, neural …
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Techniques for high-speed direct modulation of quantum dot lasers
As a major component of optical transmitters, directly-modulated semiconductor lasers are widely used in todays fiber optical link systems by taking its advantage of their low cost, compact size and low power consumption. In this work, techniques to improve the high frequency modulation …
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