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 90 for “"optical power"”.
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Opto-VLSI-based adaptive optical power splitter/combiner for next generation dynamic optical telecommunication networks
The demand for optical power splitters is growing globally, due to the rapid deployment of fibre-to-the-premises, optical metropolitan area network (MAN), and active optical cables for TV/Video signal transport. Optical splitters play an important role in passive optical network (PON) technology by …
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The effects of non-uniform illumination on the performance of series connected photovoltaic arrays
Optical power transfer has several advantages that make this technology useful in many applications. Optical power transfer is immune to the noise generating effects of Radio Frequency (RF) and Electromagnetic Interference (EMI). Transferring power optically also has the benefit of generating …
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Concentric-core optical fiber sensors
… strain sensor which uses concentric core optical fiber waveguide as the sensing element. When this particular type of fiber is strained, a transfer of optical power occurs between propagating modes in the two concentric cylindrical cores of the fiber. This strain-induced redistribution of …
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Investigation into the feasibility of an electro-optic rail surface monitor
… Rail. The electro-optic method consists of an optical projection-detection system with two mutually oblique axes. Light projected onto the rail is reflected and imaged onto a split photocell. A depression or rise in the reflective surface causes the axis of focus to shift and more light falls …
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Parameterized analysis of optical inter-satellite links for high resolution satellite communication
… signals at each antenna to the array processor. Optical inter-satellite link architectures for signal transport are investigated and parameterized models to compare the performance of each are synthesized. Both analog and digital modulation schemes for the link are considered. A two-channel …
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Fiber-Based ATM Computer Network Performance and Survivability Issues under Soft Failure Conditions
… the performance was evaluated at different optical power levels, based on throughput, transaction rate, response time, and lost data. Additionally, the bit error rate characterization of the attenuated optical fiber link was analyzed. Ultimately, performance of the fiber optic ATM-based …
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Plastic optical fibre couplers with wavelength division multiplexing capability for short-range peer-to-peer communication in networking and industrial applications
… simulation of adjustable, multi-output plastic optical fibre (POF) array couplers for wavelength-division multiplexed (WDM) transmission in the visible spectrum. The research focuses on three configurations—1×2, 1×4, and 1×8—and introduces a novel architecture that allows precise control of …
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An optical telemetry system for wireless transmission of biomedical signals across the skin
A technology base for optically-coupled systems was developed that permits in-vivo transmission of biomedical signals across the skin. By complete implantation of sensors and instrumentation electronics, problems with percutaneous connectors were eliminated. Optical power and signal transmission …
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Strain sensor using fiber bragg grating interrogation
… FBG wavelength-based monitoring method by using optical spectrum analyzers (OSA). Although FBG has better strain sensitivity measurement, however there have some restriction to monitor by using OSA. The usage of OSA are very costly, bulky and has slow scanning speed. Therefore, research is …
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Thermo-electrically pumped semiconductor light emitting diodes
… diodes (LEDs) allows these devices to emit optical power in excess of the electrical power used to drive them, with the remaining power drawn from ambient heat. In the language of semiclassical electron transport, the electrons and holes within the device absorb lattice phonons as they …
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System design and performance analysis of asymmetrically and symmetrically clipped optical (ASCO)-OFDM for IM/DD optical wireless communications
… high speed wireless service has been growing. Optical wireless communications (OWCs), which offer unlimited transmission bandwidth, have received a lot of attention and been studied in recent decades. They can be an effective alternative to radio frequency communications (RFCs) for indoor high …
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Explorations in Monocular Distance And Ranging (MODAR) Techniques for Real-World Applications
… sensor in the camera was varied to change the optical power of the lens. This setup suffered from several limitations but provided significant insight into the fundamental principles governing depth-from-focus retrieval. Finally, 12mm, f/6, Liquid Lens Cx Series Fixed Focal Length Lens from …
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Development of an Optical Fiber Biosensor with Nanoscale Self-Assembled Affinity Layer
Optical sensor systems that integrate Long-Period-Gratings (LPG) as the detection arm have been proven to be highly sensitive and reliable in many applications. With increasing public recognition of threats from bacteria-induced diseases and their potential outbreak among densely populated …
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Laser Frequency Stabilization With Pound-Drever-Hall Technique
… the frequency error and maintain constant optical power.
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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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GeSn Light-Emitting Devices
… electroluminescence (EL), as well as optical power. EL spectra of 6%, 8%, 9%, and 10% Sn LED was measured. Emission due to the direct band was observed. The wavelength of the EL spectrum peak of 2348 nm was achieved for measuring 10% Sn LED. Optical power with an average of 0.2 mW was …
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ESA based fiber optical humidity sensor
… process to fabricate a Fabry-Parot Cavity based optical fiber humidity sensor. The sensing scheme bases on the refractive index change with relative humidity of the film applied to the end of optical fiber. That is, the change in reflected optical power indicates certain humidity. To achieve …
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Semiconductor Laser Device-Level Characteristics
… lasers are highly desirable in cost-effective optical communication systems. Developing the experimental setups to extract the characteristics of the semiconductor lasers is vital to the future of the optical research projects. In this thesis, integrated experimental setup designs have been …
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Simulation of optical fibre communication systems influenced by stimulated brillouin scattering
… noise (SSDDN) component of the transmitted optical field to be simulated, probably for the first time, as well as the full transmitted field. SSDDN would not be generated from previous SBS models in which a Stokes seed replaces DTAN. SSDDN becomes the dominant form of transmitted SBS noise …
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