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 398 for “"Fiber Optic"”.
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Automated infrared fiber optic characterizer
… reducing the extrinsic losses of fluorozirconate optical fibers has increased the material research efforts for these new waveguides. Fluorozirconate fibers, which are inherently more transparent than silica fibers, are predicted to have intrinsic losses as low as 0.001 dB/km at 3.45 μm [11]. …
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High Speed Fiber Optic Spectrometer
… and mathematical model of a novel high speed fiber optic spectrometer (HSFOS). In addition, the performance analysis is conducted and preliminary experimental results are listed and discussed. Such a spectrometer is highly desired by the ever-increasing applications of fiber optic sensors. In …
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Fiber Optic Sensors for Liquid Identifications
<p>"The fiber optic Fabry-Perot interferometer (FPI) is a widely utilized sensing configuration, offering numerous advantages over conventional electronic sensors, including high accuracy, distributed sensing capabilities, immunity to electromagnetic interference, and compact size. In this study, …
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Fiber optic techniques for remote sensing
… the development of sensing systems based on optical fiber technology. This presentation opens with a short review of fiber optic sensing methods, including a discussion of several devices developed in prominent laboratories. The theoretical and empirical results of a particular technique of …
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High temperature fiber optic strain sensing
Two high temperature fiber optic based strain sensors have been developed for use in a coal combustor environment. An intensity based sensor uses losses created by longitudinal misalignment as a sensing mechanism and has a maximum operating temperature of 700°C. An interferometric based sensor …
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Fiber optic methods for nondestructive testing
This thesis demonstrates the use of fiber optic methods for nondestructive testing of composite materials and aluminum specimens using the acousto-ultrasound approach. A noncontact method using a hybrid interferometer is devised for measuring absolute surface acoustic wave (SAW) amplitudes. The …
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Performance of multichannel fiber optic parametric amplifier
Optical networks have a significant role to play in the present and future global telecommunication networking scenario due to the increasing demand for larger transmission capacity. In fiber optic communication systems, Dense Wavelength Division Multiplexing (DWDM) is very popular in which …
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Fiber optic integration in planar ion traps
… infrastructure can be scaled to smaller sizes. Fiber optics are a promising method of measurement because they collect a large fraction of light scattered by the trapped ions, and many optical fibers can be placed in a small area, allowing more ions to be measured in a small region. The question …
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Studies in fiber-optic couplers and resonators
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Improvements in fiber optic coupler fabrication techniques
… in the refractive index. The cores of individual fibers in the minimum taper region are a few micrometers apart. Diffusion thus results in a minimum taper region that has approximately uniform refractive index leading to better uniformity among ports. The experimental setup and results of …
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Femtosecond-Laser-Enabled Fiber-Optic Interferometric Devices
… truly three-dimensional fabrication. Moreover, fiber-optic sensors have demonstrated distinct advantages over traditional electrical sensors such as the immunity to electromagnetic interference, miniature footprint, robust performance, and high sensitivity. Therefore, the marriage between …
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Temperature insensitive fiber optic interferometer and applications
A method of modifying a uÌ ber optic fused biconical tapered coupler to produce a relatively temperature insensitive Michelson interferometer is presented. The modification was accomplished by cleaving the coupler after the minimum taper region and polishing, perpendicular to the endface, to a …
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Fiber-optic sensors for weigh-in-motion application
… and possibly further errors. In this thesis, a fiber-optic sensor is proposed which measures the pressure generated by the weight of a vehicle. The system consists of a pneumatic tube filled with an incompressible fluid, a rubber pad embedding the tube, a diaphragm to convert pressure into …
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SPECTRALLY EFFICIENT MULTICARRIER SYSTEMS FOR FIBER-OPTIC TRANSMISSION
… of spectrally efficient multicarrier systems for fiber-optic transmission. Multicarrier optical systems partition a high-data rate digital signal in a wavelength channel into multiple subcarriers. The data rate on each subcarrier can be sufficiently low and thus, the tolerance to transmission …
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Multiplexing methods for fiber optic local communication networks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.
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In-situ backplane inspection of fiber optic ferrules
… are envisioned to have hundreds and thousands of optical interconnects among components. An optical interconnect attains a bandwidth-distance product as high as 90 GHz.km, about 200 times higher than can be attained by a copper interconnect. But defects (such as dust or scratches) as small as 1 …
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Toward a noise-free interferometric fiber optic gyroscope
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Gain distribution in fiber-optic local communication networks
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
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Miniature fiber-optic multicavity Fabry-Perot interferometric biosensor
Fiber-optic Fabry-Perot interferometric (FFPI) sensors have been widely used due to their high sensitivity, ease of fabrication, miniature size, and capability for multiplexing. However, direct measurement of self-assembled thin films, receptor immobilization process or biological reaction is …
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