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 19 of 19 for “"optical signal processing"”.
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Development of non-linear waveguide devices for optical signal processing
… poling, a technique which produces second-order optical nonlinearity in glass. Poling of glass has drawn much attention because frequency conversion and electro-optic modulation, operations which are typically restricted to crystals, becomes feasible in glass fibres and waveguides which are …
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All-optical signal processing using cascaded quadratic interactions in periodically poled lithium niobate waveguides
This thesis investigates all-optical signal processing using cascaded quadratic nonlinearities in periodically poled lithium niobate (PPLN) waveguides for telecommunication applications. PPLN waveguides which possess high second-order nonlinearity are attractive due to their suitable properties …
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High speed nonlinear optical components for next-generation optical communications
Electronic signal processing systems currently employed at core internet routers require huge amounts of power to operate and they may be unable to continue to satisfy consumer demand for more bandwidth without an inordinate increase in cost, size and/or energy consumption. Optical signal …
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Nonlinear Optics in III-V Quaternary Semiconductor Waveguides
… for wider bandwidths and heat dissipation. All-optical signal processing is demonstrated as a potential solution. A major improvement in cost and speed of networking systems is expected through replacing microelectronics by photonic chips. However, the variety of operations essential to perform …
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Processing of ultra-short optical pulses for high bit-rate optical communications
… linear pulse shapers into various all-optical signal processing devices for applications in high speed optical communication systems, to enhance the overall system performance, is investigated. The linear pulse shaping is performed using superstructured fibre Bragg gratings, which seem …
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Theory and design of high-index-contrast microphotonic circuits
… are described. They show a progression of new optical signal processing capabilities that enable chip-scale microphotonic routers for high bandwidth and fine granularity optical wavelength routing networks. Rigorous theoretical models are developed that enable the design of efficient …
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All-optical interferometric switches for data regeneration in fiber optic networks
… Gb/s. In the laboratory, data rates in a single optical fiber have already reached tens of Tb/s. These data rates greatly exceed electronic processing rates, so researchers have turned to all-optical signal processing to achieve many basic network tasks, like wavelength conversion, packet …
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Demonstrating effective all-optical processing in ultrafast data networks using semiconductor optical amplifiers
… high-bandwidth applications such as video. All-optical signal processing is one promising technique for providing the necessary capacity and offers payload transparency, power consumption which scales efficiently with increasing bit rates, reduced processing latency, and ultrafast performance. …
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Non-linear optical properties of semiconductor nano-structures for slow light and wavelength conversion
The use of semiconductor nanostructures for all-optical signal processing is investigated. We first examine theoretically the utilization of quantum dots for wavelength conversion via four-wave mixing. Our results show that quantum dots with only a single bound state are more efficient than both …
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Development of Fiber Optic Aerodynamic Sensors for High Reynolds Number Supersonic Flows
… supersonic flow. Using a standard fiber optic signal conditioning unit (specifically a broadband interferometric system using spectra), the work centered around determining under what conditions these sensors will work effectively and quantifying the total system limitations. An …
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Tapered Splice for Efficient Power Coupling to Small-Core Nonlinear Fibers
… in nonlinear devices for different types of optical signal processing, such as Raman or parametric amplifiers. The small nonlinearity of conventional single-mode fibers sets a major limitation for these devices. A large nonlinearity can be achieved by having a large nonlinear coefficient, a …
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Modeling Dark- and Light-Induced Crystal Structures and Single-Crystal Optical Absorption Spectra of Ruthenium-Based Complexes that Undergo SO2-Linkage Photoisomerization
… complexes of the type [Ru(SO2)(NH3)4X]Y exhibit optical-switching capabilities in their single-crystal state. This striking effect is caused by photoisomerization of metastable photoinduced states, which are metastable if kept at suitably low temperatures. This illustrates the possibility of …
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All optical systems for terabit network era
… capacity demand drives the development of the optical fiber networks. Since optical super-channels carrying multi- Terabit/s transmissions are the next evolution of the optical links, future transmitters and receivers systems will be required to handle vast volume of information while …
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Nonlinear Periodic Structures: From Classical to Quantum Devices
… transfer-matrix (TDTM), is presented to simulate optical pulse propagation in layered media with resonant nonlinearity. As there were no satisfactory methods in the literature to model this problem, in order to validate and compare with the TDTM method, the standard FDTD method is generalized to …
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Multi-Reference Pseudo-Random Phase-Encoded Joint Transfrom Correlation
We propose and demonstrate the superiority of using a phase SLM only in a multi-reference phase encoded joint transform correlator(JTC) compared to an ordinary JTC. Maximal length sequences are shifted to form two dimensional orthogonal arrays referred as m-arrays. The phase mask is used in one …
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Modeling of devices for gallium-nitride-based integrated photonics
… such as medical inspection, sterilization, optical storage, solid-state lighting, and the blue-green light sources in full-color displays have made GaN-related devices influential in people’s daily life. Most of the research to date on III-nitride (III-N) semiconductors has concentrated on …
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Electrostatic micro actuators for mirror and other applications
… important building blocks for innovations in optical signal processing and computing systems due to their inherently small size, high density, high speed and low power consumption. Generally, the principle of operation in these systems can be described as: an electrostatic attractive force …
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One-dimensional photonic crystal / photonic wire cavities based on silicon-on-insulator (SOI)
… interest in recent research to produce faster optical processing for many telecommunications applications, as well as other applications of high performance optoelectronics. The combination of one-dimensional photonic crystal structures (PhC) and narrow photonic wire (PhW) waveguides in high …