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 18 of 18 for “"high-speed modulation"”.
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High-Speed Modulation of Semiconductor Lasers and Modulators
High-speed laser sources are critical components in optical communications systems and are presently the subject of intense research efforts. We present a comprehensive study of different modulation schemes. First, modulation schemes on a single semiconductor laser are investigated and compared for …
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Output Characteristics and High-Speed Modulation of Composite -Resonator Vertical -Cavity Lasers
… are explored with the goal of understanding the high-speed direct modulation of these devices from theoretical and experimental perspectives. The epitaxial structure is considered and one dimensional simulations of the mode profile in the CRVCL are used to model several different designs, which …
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Temperature-Dependent High-Speed Modulation and Wavelength Conversion Using Quantum-Well Lasers
… temperature-dependent effects that determine the high-speed modulation response and wavelength conversion in long-wavelength semiconductor lasers is presented. The steady-state measurement of gain is presented through four different approaches, including the direct (Hakki-Paoli) measurement of …
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Optical loss and high-speed modulation of vertical-cavity surface-emitting lasers
… interconnects. By increasing the efficiency and modulation speed of these devices, it will be possible to continue to meet a globally increasing demand for bandwidth. After a fundamental discussion of VCSEL design and operation, this thesis focuses on how to improve these microcavity lasers for …
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High-speed modulation of resonant CMOS photonic modulators in deep-submicron CMOS
… a photonic modulator are investigated to achieve high energy efficiency in a constrained monolithic process. Two digital modulator topologies are simulated, fabricated and tested. One circuit topology, intended to drive a carrier-injection-based ring modulator, uses a digital push-pull topology …
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High-speed modulation of resonant CMOS photonic modulators in deep-submicron bulk-CMOS
… ring modulator are investigated to achieve high energy-efficiency in a constrained monolithic process. A digital modulator driver circuit is designed, simulated, fabricated and partially tested. This circuit uses a push-pull topology with pre emphasis to reduce the energy per bit and to …
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High-speed modulation of semiconductor lasers and properties of silver-coated quantum-dot lasers
… integration density, there is also a desire for high-speed lasers that have a large direct modulation bandwidth and eliminate the need for external modulators. Nanoplasmonic lasers and their high-speed characteristics are thus an important topic of research. In this thesis, experimental …
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Impurity-induced disordering of vertical-cavity surface-emitting lasers: Applications to polarization control and high-speed modulation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Coherently-coupled vertical-cavity laser arrays
… offer a unique approach to beam steering and high-radiance applications, and have many advantages such as small size, low cost, high speed, durability and manufacturing ease. Previous work on coherently-coupled VCSEL arrays has left unfinished the tasks of determining the beam steering …
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Electrical parasitics and parameter extraction of photonic crystal vertical-cavity surface-emitting lasers
… lasers have been designed and fabricated for high power and high speed operation. To characterize performance of these devices, we perform DC and small signal modulation analysis. Impedance characteristics and electrical parasitics are studied for various photonic crystal designs to understand …
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Coupled -Cavity Surface -Emitting Lasers: Modulation Concepts, Performance and Applications
Several novel modulation concepts are developed for a composite-resonator vertical-cavity laser (CRVCL) with the objective to extend laser bandwidth beyond that of a conventional vertical-cavity surface-emitting laser (VCSEL), and several new device applications for optical communication and signal …
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Analysis and validation of an artifact resistant design for oxygen saturation measurement using photo pletyhsmographic ring sensors
… minimal power consumption while maintaining high signal quality. To this end, significant effort has been channeled to the development of an appropriate motion artifact model, representing the complex interplay between internal hemodynamics and external influences. Additionally, an artifact …
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Germanium-rich silicon-germanium materials for field-effect modular application
The development of electric-field-induced optical modulation in the materials capable of monolithically integrated on silicon (Si) substrates offer the possibility of high-speed modulation in a pico second timeframe as well as low power consumption, key requirements for integrated modulator …
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Study of Type-I and Type-Ii Strained Quantum -Well Lasers
… are investigated both in the steady-state and high-speed modulation schemes. We show excellent agreement of our experimental data with the results of our theoretical gain model with many-body effects. The temperature-dependent characteristics of both material systems are compared. The InGaAsP …
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Theoretical investigation of metal-cavity nanolasers and nanoLEDs and comparison with experiments
… our group. The metal-cavity microlasers show the highest power among current metalcavity lasers and they operate at continuous-wave (CW) electrical injection at room temperature. We study this structure from calculating its gain profile of coupled multiple quantum wells (MQWs) and fit the …
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Efficient, high-power operation of CW Yb:YAG and Q-switched Nd:YAG planar waveguide lasers
… gain medium o ers a good approach to creating a high- power lasers. Excellent thermal properties allow for lasers with good beam-quality and high-e ciency. A Neodymium doped YAG planar waveguide laser was actively Q-switched using a hybrid unstable resonator and acousto-optic modulator. A Yt- …
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Heterogeneous integration of two-dimensional materials for on-chip optical interconnects
… can form a variety of 2D heterostructures with high quality, enabling potential optoelectronic devices that were not feasible using silicon and other bulk semiconductors. In this dissertation, I present several classes of active photonic components in a 2D materials-based heterogeneous …
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Theory and simulation of quantum nanostructures for integrated photonics
… and quantum QD properties. QUDOS provides a high degree of flexibility, allowing to simulate a variety of heterostructures, including numerous QD shapes both with and without wetting layers, QD molecules and QD-in-a-well structures, and composition-graded or arbitrarily oriented QDs. The core …