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 “"single mode fibers"”.
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Coupling Down Converted Light Into Single Mode Fibers
… the influence of the pump and collection mode parameters on the collection efficiency of Type I down converted photons into single mode fibers. For best single and coincidence counting rates, we find that the mode sizes should be close to the same size and that the mode waists should be …
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A system model for the effect of Polarization Mode Dispersion on digital modulated optical signals in single mode fibers
<p>A comprehensive systems model that retains the discrete nature of the output delay distribution in order to accurately characterize the pulse broadening due to Polarization Mode Dispersion (PMD) is developed in this thesis. PMD in optical channels has been a critical factor limiting high-speed …
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Loss phenomena in perturbed single-mode optical fibers: investigation and applications
Losses induced in a single-mode fiber due to periodic spatial deformations along the fiber axis have been investigated spectrally. Deformation losses in several single-mode fibers were found to be strongly wavelength dependent. This wavelength dependence was characterized by narrow attenuation …
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Construction of an optical fiber strian gauge
… pattern from the signals carried on two bare single-mode fibers that are fastened to an aluminum cantilever. When the cantilever experiences flexural stress, the interference pattern should change. By observing this change, it is possible to determine the strain experienced by the cantilever. …
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Characterizing the structure of transmission matrix in lower dimensions
Multimode optical fibers are promising candidates for revolutionizing telecommunication because of high data rate and endoscopic applications because of the ability to capture similar information as single mode fibers but with much smaller footprint and hence lesser invasion. The major difficulty …
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Tapered Splice for Efficient Power Coupling to Small-Core Nonlinear Fibers
… 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 small effective area, or both. Having a small effective area, however, requires efficient coupling to very …
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Quasi-Distributed Intrinsic Fabry-Perot Interferometric Fiber Sensor for Temperature and Strain Sensing
… presents detailed research on the design, modeling, analysis, system implementation, sensor fabrication, performance evaluation, sensor field test and noise analysis of a quasi-distributed intrinsic Fabry-Perot interferometric (IFPI) fiber sensor suitable for temperature and strain …
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Adaptive Mode Control in Few-Mode and Highly Multimode Fibers
Few-mode fibers (FMFs) and multimode fibers (MMFs) can provide much higher data-carrying capacities compared with single-mode fibers. But in order to achieve this goal, one must address the challenge of intermodal coupling and dispersion. Therefore the ability to accurately control the optical …
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Designs for Zero Polarization-Mode Dispersion And Polarization-Maintaining Fibers
… aspects pertaining to polarization in optical fibers and optical waveguide devices. In particular, the analysis and design of fibers that maintain polarization over long lengths, provide zero polarization-mode dispersion, and function as polarizers or mode filters are presented. First, optimum …
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MINERVA-RED: A TELESCOPE DEDICATED TO THE DISCOVERY OF NEARBY PLANETS
… spectrograph system, which is designed around single-mode fibers and high-speed guiding, along with its low-cost environmental control system that provides milliKelvin temperature stability for the instrument. I will discuss the current limitations of the MINERVA-Red system and how in the …
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Optical low coherence reflectometery for morphological characterization of static and dynamic systems
… thickness and refractive index measurements of single- and multiple-layer polymer films. It also became the backbone of a new medical imaging technique, called Optical Coherence Tomography.The OLCR instrument used in this research is a commercially available Hewlett-Packard 8504A High Precision …
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Effect of Dispersion on SS-WDM Systems
… system, specifically a system employing a single-mode optical fiber. The system performance is expressed in term of the receiver sensitivity defined as the average number of photon per bit <i>N<sub>p</i> </sub>required for a given probability of bit error <i>P<sub>e</sub></i>. The receiver …
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Analysis and design of broadband single-mode multi-clad fibers
… been paid to the study of dispersion-flattened single-mode fibers which offer a high transmission capacity with low losses through a wide range of wavelengths. However, the existing designs are sensitive to bending and manufacturing tolerances, and are not truly single-mode at most wavelengths …
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HIGH PERFORMANCE NANOPHOTONIC CAVITIES AND INTERCONNECTS FOR OPTICAL PARAMETRIC OSCILLATORS AND QUANTUM EMITTERS
… produce useful states of light, like solitons or single photons, through carefully engineered light-matter interactions. However, practical devices demand advanced integration techniques to meet the needs of cutting-edge technologies. High performance nanophotonic cavities and interconnects …
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Integrated silicon photonic two-dimensional grating couplers
… interfacing to the transmission links, based on single-mode fibers (SMFs). On the one hand, there is a large mode-field mismatch between the tiny on-chip Si waveguide with an area of about 0.1 µm² and the external SMF with a core diameter of around 10 µm. In addition, there is a severe …
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Path calibration algorithms for many-aperture fiber-linked broadband hypertelescopes
… pupil densification. When implemented with single-mode fibers, the hypertelescope offers simplicity and the ability to expand to many-aperture configurations. However, broadband imaging requires that the optical path lengths all be matched to within a fraction of the wavelength. Telescopes …
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Liquid Crystal Optics For Communications, Signal Processing And 3-d Microscopic Imaging
… a laser beam coupled between two identical single mode fibers (SMF) was mis-aligned away from the output fiber causing the intensity of the output coupled light to decrease as a function of the angular deflection. Since the angular deflection is electrically controlled, hence the VOA …
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Digital equalization techniques for the compensation of nonlinear impairments in long-haul coherent optical communication systems
… (i.e., Chromatic Dispersion (CD), Polarization Mode Dispersion (PMD), fiber nonlinearities) due to its more compact spectrum and constant envelope compared to on-off keying. Nonetheless, fiber-optic communication systems using DPSK were severely degraded by nonlinear phase noise. One way to …