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 59 for “"distributed feedback"”.
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Gain-distributed feedback filters
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Evacuation Distributed Feedback Control and Abstraction
In this dissertation, we develop feedback control strategies that can be used for evacuating people. Pedestrian models are based on macroscopic or microscopic behavior. We use the macroscopic modeling approach, where pedestrians are treated in an aggregate way and detailed interactions are …
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Distributed Feedback Laser Biosensor in Microplate Format
… was used to fabricate large area (~3x5 in2) distributed feedback laser biosensors (DFBLB) on flexible plastic substrates, which were subsequently incorporated into standard format 96-well microplates. A room temperature nanoreplica molding process was used to create subwavelength periodic …
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Distributed feedback fibre laser strain and temperature sensors
… the development of two new types of polarimetric distributed feedback (DFB) fibre laser sensors for simultaneous strain and temperature measurements. These fibre Bragg grating (FBG) based sensors offer strain and temperature measurement accuracies of ±0.3 - ±15 µ.epsilon and ±0.04 - ±0.2°C which …
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Organic semiconductor lasers with two-dimensional distributed feedback
… this work optically pumped lasers with spatially distributed feedback were fabricated by deposition of a thin film of an OS on a nanopatterned substrate. Upon optical excitation with femtosecond laser pulses laser operation is observed. It is characterized using time-integrated and time-resolved …
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Four-Wave Mixing in Distributed-Feedback Semiconductor Lasers
… measurements of dual-pump four-wave mixing in distributed-feedback lasers with two lasing modes for both the parallel and orthogonally polarizations. For the parallel case, we develop a comprehensive model for dual-pump four-wave mixing. The experiments show that the conversion efficiency has …
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Instrumentation for a distributed feedback laser biosensor system
… biosensor system based on a vertically emitting distributed feedback laser is presented. The performance of the label-free high-resolution biomolecular detection system is optimized for use in applications that require the study of large quantities of parallel interactions that could be adversely …
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Design and development of distributed feedback transistor lasers
… or stabilizing mechanisms. Stable single-mode distributed feedback diode laser sources are important in many applications including spectroscopy, as pump sources for amplifiers and solid-state lasers, for use in coherent communication systems, and now as TLs potentially for integrated …
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GaN-based distributed feedback laser diodes and their applications
… Gallium Nitride (GaN) based laterally coupled distributed feedback (LC-DFB) LDs, and their properties. The design, fabrication, and experimental characterisation of GaN LC-DFBs is discussed, and several parameters important in quantifying device quality, including spectral characteristics, …
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Optically Pumped Type-II Mid-Infrared Tunable Distributed Feedback Lasers
… type-II mid-infrared index-coupled tunable distributed feed- back (DFB) semiconductor lasers have been developed to provide continuous-wave (CW) single longitudinal mode (SLM) operation with features including narrow spec- tral linewidth, high output power, good beam quality and wide …
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Label-free biosensor based upon a vertically emitting distributed feedback laser
… for the fabrication of solid state organic distributed feedback laser (DFB) biosensors. The combined techniques enable the organic DFB laser to be uniformly fabricated over large surface areas upon a flexible plastic substrate, with an approach that is compatible with roll-based …
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Surface-emitting distributed feedback terahertz quantum-cascade phase-locked laser arrays
… and implemented. Several surface-emitting distributed feedback terahertz lasers are coupled through the connection phase sectors between them. Through carefully choosing the length of phase sectors, each laser will be in-phase locked with each other and thus create a tighter beam-pattern …
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Label-Free Biosensor Based Upon Replica-Molded Vertically Emitting Distributed Feedback Laser
The DFB laser sensor represents a departure from conventional passive resonant sensors insofar as the device actively generates its own narrowband high-intensity output without stringent requirements on the coupling alignments resulting in a simple, robust illumination and detection configuration. …
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Integrable semiconductor ring lasers and two-dimensional rectangular lattice distributed feedback lasers
… described. Two-dimensional rectangular lattice distributed feedback lasers are proposed and analyzed by a coupled mode theory.
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Graded wavelength filter based wavelength detection for a distributed feedback laser biosensor
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2009-12-11T18:39:31Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Altaf_Kashif.docx: 2180725 bytes, checksum: 1eda169a0e92f4bceba9ba7fb757bf1c (MD5) Altaf_Kashif.pdf: 13322684 bytes, …
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Distributed Feedback Control Algorithms for Cooperative Locomotion: From Bipedal to Quadrupedal Robots
This thesis synthesizes general and scalable distributed nonlinear control algorithms with application to legged robots. It explores both naturally decentralized problems in legged locomotion, such as the collaborative control of human-lower extremity prosthesis and the decomposition of …
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Design method for ultimate efficiency in linear-cavity continuous-wave lasers using distributed-feedback
… single point in the entire cavity byemploying distributed-feedback for the maximum local, as a result, for the maximum overall conversion efficiency.<br/><br/>Theoretical study starts with the critical investigation of the previous optimisation approaches. After addressing the limitations of …
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Synthesis, design and characterization of a distributed feedback grating based non-linear optical chemosensor
… with which we have focused our efforts is the Distributed Feedback (DFB) laser cavity. The waveguide materials synthesized are Si and Ti inorganic matrices that were optimized for optical waveguiding by determining the appropriate film thickness, refractive index and film smoothness. Amplified …
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Distributed Feedback Ridge Waveguide and Step-Graded Separate Confinement Quantum Well Heterostructure Lasers Grown by Metalorganic Chemical Vapor Deposition
… and the development of novel strained-layer distributed feedback ridge waveguide (DFB RW) quantum well laser and laser array are presented in this work.
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Temperature and Spatial Hole Burning Effects in Semiconductor Lasers and Integrated Optical Devices
… devices, including Fabry-Perot (FP) lasers, distributed-feedback (DFB) lasers, and integrated electroabsorption modulator with DFB lasers (EML). First, the temperature dependence of bulk InGaAsP semiconductor laser diodes is analyzed using a consistent method involving gain and spontaneous …
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