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 10260 for “"optical"”.
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Optical frequency comb generation in optical fibres
Optical frequency combs (OFC) constitute an array of phase-correlated equidistant spectral lines with nearly equal intensities over a broad spectral range. The adaptations of combs generated in mode-locked lasers proved to be highly efficient for the calibration of high-resolution (resolving power …
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Optical engineering of parallel optical data storage
… readout of those data structures, relies on an optical system with two distinct paths. The object path is typically a 4F system relaying a high space-bandwidth-product object to an image plane with the storage medium placed near the Fourier plane. Optical system parallelism, measured by …
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Optical parametric amplification of optical imaging signals
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01
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Optical packet networking using optical time division multiplexing.
… have stimulated the development of high-speed optical shared media networks. At present, most research on optical networking has concentrated on wavelength-division multiplexing (WDM). Optical time-division multiplexing (OTDM), which offers advantages over WDM networks, is considered as an …
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Optical parametric oscillators and precision optical frequency measurements
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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A class of optical receivers using optical feedback
Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Optical Path Length Multiplexing of Optical Fiber Sensors
Optical fiber sensor multiplexing reduces cost per sensor by designing a system that minimizes the expensive system components (sources, spectrometers, etc.) needed for a set number of sensors. The market for multiplexed optical sensors is growing as fiberoptic sensors are finding application in …
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optical engineer
In this research an approach to all optical delta sigma modulator (ADSM) has been elaborated. Two important components of ADSM; "leaky integrator" and "inverted bi-stable quantizer" were modeled, on the basis of cross gain modulation of the Semiconductor Optical Amplifier (SOA). The simulations …
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Optical publishing
Thesis (M.S.V.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1983.
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Optical performance
… of colored images, 16mm film projection, optical printing and cameraless animation techniques were utilized. Manipulation of stained glass and glass dyes resulted in a series of colored glass slides for still projection. Work with black film leader resulted in abandoning the traditional …
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Nonlinear optical properties of natural dyes based on optical resonance
Recent research shows that the study of optical properties of organic material natural dyes has gained much consideration. The specific functional groups in several natural dyes remain essential for the large nonlinear absorption expressed in terms of nonlinear optical susceptibilities or other …
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Novel all-optical switching and processing techniques for optical networking
In this thesis, the possibility of processing optical time-division multiplexing (OTDM) signals in both the temporal and spectral domains is investigated. The technique relies on the conversion of high-speed OTDM signals into a mixed time and wavelength division multiplexing (TDM-WDM) format. …
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Optical comb injection for optical demultiplexing and harmonic frequency locking
… the continued growth of internet traffic, new optical communication infrastructures capable of dramatically increasing network bandwidth are being considered. Optical superchannels consisting of densely packed channels will be required for future networks, which could potentially be implemented …
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High speed nonlinear optical components for next-generation optical communications
… in cost, size and/or energy consumption. Optical signal processing techniques may be deployed in next-generation optical networks for simple tasks such as wavelength conversion, demultiplexing and format conversion at high speed (≥100Gb.s-1) to alleviate the pressure on existing core …
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SOA enhanced optical line terminal for future optical access network
Future passive optical networks (PONs) aim to deliver data rates of 100 Gb/s per wavelength using intensity-modulation direct detection (IM/DD) and up to 400 Gb/s per wavelength using coherent technology. Achieving these targets requires overcoming the large dynamic range of burst-mode upstream …
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Optical biopsy of in vivo tissue using optical coherence tomography
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Optical domain subsampling for data-efficient optical coherence tomography (OCT)
Recent advances in optical coherence tomography (OCT) have led to higher-speed sources that support imaging over longer depth ranges. Limitations in the bandwidth of state-of-the-art acquisition electronics, however, prevent adoption of these advances into clinical applications. This thesis …
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Cryogenic optical refrigeration
This thesis compiles recent achievements in optical refrigeration, cooling a 5 wt. % ytterbium doped yttrium lithium fluoride (Yb+3:YLF) crystal through anti-Stokes fluorescence to a new record low temperature. This is the coldest temperature to date, without the use of cryogens or mechanical …
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