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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 40 for “"optical loss"”.
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Optical loss and high-speed modulation of vertical-cavity surface-emitting lasers
… extensively as the light source of short-haul optical data communication and optical 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 …
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Size and reflectivity dependent optical loss in oxide-confined vertical-cavity surface-emitting lasers
Made available in DSpace on 2017-08-10T20:33:30Z (GMT). No. of bitstreams: 2 LAKOMY-THESIS-2017.pdf: 958914 bytes, checksum: 4bfff61cb428f89b6c2d81ea490c1d54 (MD5) LICENSE.txt: 4213 bytes, checksum: c559050e8766c9fd328f1cde81a9d514 (MD5) Previous issue date: 2017-04-28
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Cold-cavity measurement of excess optical loss in oxide-confined vertical cavity surface emitting lasers
… requires a quantitative knowledge of the cavity optical losses. A generalized method using sub-threshold spectral measurements matched to model calculations is demonstrated to determine optical loss in microcavity lasers. Cold-cavity spectral characteristics are used to extract the size dependent …
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Temperature Dependent Behavior of Optical Loss from Hydrogen Species in Optical Fibers at High Temperature
… study reports on the behavior of silica based optical fibers in a hydrogen environment at high temperatures. The hydrogen response in the form of optical loss in the wavelength range of 1000-2500 nm of a germanium doped graded index 50/125 graded index fiber was examined in the temperature …
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Optical Sensors for High-Temperature Pressure Measurement and Real-Time Particle Detection
… we report the development of two types of optical sensors, one for high temperature pressure measurements and the other for real-time particle detection. With a high melting temperature (over 2000°C), low optical loss, and excellent corrosion resistance, sapphire (α-Al₂O₃) is ideal for high …
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Applications of long storage time optical cavities
Optical precision measurements have become one of the most important tools in physics to test the fundamental laws and to probe the universe around us. Often such experiments require high finesse cavities, and optical loss in these cavities is a critical parameter. In particular, for those cavities …
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Architectures and Design Automation for Photonic Networks On Chip
… design and engineering issues such as optical loss, crosstalk, and packaging have slowed its entry into widespread adoption at the chip and board scale. In this work, we present these issues and potential design improvements. The major contributions, however, are the tools and methods …
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Spatial Mode Filters for Control of Lateral Modes in High Power Semiconductor Lasers
… can be integrated into the laser that introduce optical loss to only high-order lateral modes and thus prevent them from lasing and degrading the beam quality. Several concepts for modifying the lateral waveguide to create filtering of the lateral modes are examined, including the use of …
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Integrated polarisation rotators
… and manipulate the state of polarisation of optical signals is becoming an increasingly desirable feature in numerous applications including integrated optical circuits, semiconductor optical amplifiers (SOAs) and optical communication systems. This thesis introduces the design, optimisation, …
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Theory of Modulation Response of Semiconductor Quantum Dot Lasers
… /><br />1) Carrier capture delay from the optical confinement layer into QDs<br /><br />Closed-form analytical expressions are obtained for the modulation bandwidth omega_{-3 dB} of a QD laser in the limiting cases of fast and slow capture into QDs. omega_{-3 dB} is highest in the case of …
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Structure-property correlations in fluoroaryl functionalized inorganic-organic hybrid polymers for telecom applications
… (inorganic-organic hybrid polymers) for optical waveguide applications in telecommunication is presented. The preparation of the materials included precursor silane synthesis, hydrolysis/polycondensation of organoalkoxysilane mixtures, and photolithographic processing of the resulting …
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High-index-contrast electromechanical optical switches
… to replace protocol-dependent, bandwidth-limited optical networks with intelligent optically-transparent integrated photonic networks. Several electromechanical optical switches are explored with the intent of being utilized as optical switching elements in transparent, integrated photonic …
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Evanescently Coupled Vertical Cavity Laser Arrays
Evanescent optical coupling between elements in vertical cavity surface emitting laser (VCSEL) arrays is interesting for applications in areas such as optical communications, image processing, and electronic beam-steering. Past work in coherently coupled VCSEL arrays has resulted in out-of-phase …
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High quality integrated LiNbO3 acousto-optic platform for visible light spectrum
… devices such as efficient microwave converters, optical isolators, and wavelength scale acousto-optic frequency shifters, which were not realizable before. However, all of these devices target the 1550 nm optical wavelength or mid IR spectrum, and there is no integrated acousto-optic platform for …
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Design, fabrication, and characterization of a lithium niobate optomechanical photodetector based on released whispering-gallery-mode microdisk resonators
… material that also exhibits promising optical characteristics such as low optical loss and high electro-optic coefficient, making it an interesting choice for Radio Frequency (RF) micro-opto-electro-mechanical systems (MOEMS) and devices, electro-optical modulators and tunable filters, …
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Proton-Implanted Photonic Crystal and Holey Vertical -Cavity Surface -Emitting Lasers
… provided by the etched pattern and its effect on optical loss, continuous-wave and pulsed excitation experiments are performed. It is shown that proper pattern design leads to improved fundamental-mode output power, decreased threshold, and increased efficiency relative to unetched, but otherwise …
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Intrachip clock signal distribution via si-based optical interconnect
The Optical clocking has emerged as an innovative alternative approach to the electrical clocking, in order to overcome the difficulties associated with electrical interconnects in the synchronization of high-performance multi-GHz microprocessors. Because the on-chip optical interconnect must be …
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Mode Matching sensing in Frequency Dependent Squeezing Source for Advanced Virgo plus
… The mismatch can be modelled as a simple optical loss in the first approximation. If the beam shape of squeezed vacuum does not match the resonance mode, part of its amplitude is lost and replaced with the incoherent vacuum. However, this modelisation is valid only in simple setups, e.g. …
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Squeezed light sources for current and future interferometric gravitational-wave detectors
… must meet stringent requirements in terms of optical loss, phase noise, and scattered light. The squeezer must produce high levels of audio-band squeezing and operate under vacuum, to take advantage of the excellent existing isolation systems and to minimise optical loss. At design …
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Squeezed light sources for current and future interferometric gravitational-wave detectors
… must meet stringent requirements in terms of optical loss, phase noise, and scattered light. The squeezer must produce high levels of audio-band squeezing and operate under vacuum, to take advantage of the excellent existing isolation systems and to minimise optical loss. At design …
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