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 24 for “"multimode fiber"”.
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Imaging through optical multimode fiber: towards ultra-thin endoscopy
… the concept of utilizing a single optical multimode fiber (MMF) as a stand-alone image conduit. MMF is fascinating as an optical waveguide attributed to its ultra-small footprint, high data throughput, low cost, and flexibility. Nevertheless, the mode mixing and dispersion effects inherent …
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Modeling, Analysis, and Design of Subcarrier Multiplexing on Multimode Fiber
… on the use of subcarrier multiplexing (SCM) in multimode fibers, utilizing carrier frequencies above what is generally utilized for multimode fiber transmission, to achieve high bit rates. In the high frequency region (i.e., frequencies larger than the intermodal bandwidth), the magnitude …
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Study of Multimode Extrinsic Fabry-Perot Interferometric Fiber Optic Sensor on Biosensing
… structure. In previous research, a single mode fiber (SMF) sensor system had been investigated for the thin-film measurement due to the high fringe visibility. However, compared with a SMF sensor system, a multimode fiber (MMF) sensor system is lower-cost and has larger sensing area (the fiber …
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Self-Calibrated Interferometric/Intensity Based Fiber Optic Temperature Sensors
… the objective of providing robust and reliable fiber optic temperature sensors capable of operating in harsh environments, a novel type of fiber optic sensor system titled self-calibrated interferometric/intensity-based (SCIIB) fiber optic temperature sensor system is presented in this thesis …
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Extrinsic Fabry-Perot interferometer for surface acoustic wave measurement
… interferometer is described. A single-mode fiber, used as the input/output fiber, and a multimode fiber, used mainly as a reflector, form an air-gap that acts as a low-finesse Fabry-Perot cavity. The Fresnel reference reflection from the glass/air interface at the front of the air-gap …
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Chemical sensing applications of fiber optics
… of this research is the implementation of a fiber optic sensor to measure refractive indices of unknown solutions. The surface plasmon sensor, interrogated with white light resulted in attenuations of light at different wavelengths when solutions of different refractive indices were …
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Improving fairness, throughput and blocking performance for long haul and short reach optical networks
… routing and wavelength assignment schemes in multimode fiber networks. Two additional schemes for long haul networks are presented and evaluated over multimode fiber networks. First for alleviating the fairness problem in OBS networks using wavelength-division multiplexing as well as …
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Deep and Dynamic Metabolic and Structural Imaging in Living Tissues
… human multicellular microtissues by adopting multimode fiber (MMF)-based low-repetition-rate high-peak-power three-photon (3P) excitation of NAD(P)H at 1100nm. This is achieved by having over 0.5MW peak power at the band of 1100±25nm through adaptively modulating multimodal nonlinear pulse …
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Improvements in fiber optic coupler fabrication techniques
… manufacturing fused biconical tapered multi-port multimode couplers with improved uniformity among ports is presented. Improvement in the uniformity of the couplers is achieved by diffusion of the minimum taper region of the coupler. The phenomenon of dopant transport from the core to the cladding …
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Optical fiber modal domain sensors for dynamic strain measurement
… measurements. At the same time, optical fiber sensors have been identified as an ideal candidate for embedded and attached measurements of material parameters such as strain, temperature, or state of damage. In particular, sensors based on optical fiber modal interference phenomena have …
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Wavelength compensation in fused fiber couplers
The performance of fused fiber couplers is wavelength dependent. Wavelength spectral compensation is a technique to decrease the effect of the wavelength dependence, which is an essential task for many applications in fiber optic communication systems. Fiber devices such as wavelength-flattened …
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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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Optical Coherence Sensors in Multimode Fibers
Optical fiber sensors are widely applied in modern sensing systems. Taking advantage of the high sensitivity of optical interference, optical coherence fiber sensors, such as fiber Bragg gratings (FBGs) and Fabry-Perot interferometers (FPIs), have been investigated intensively and utilized broadly …
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Modeling and Signal Processing of Low-Finesse Fabry-Perot Interferometric Fiber Optic Sensors
… several theoretical issues in low-finesse fiber optic Fabry-Perot Interferometric (FPI) sensors. The work is divided into two levels: modeling of the sensors, and signal processing based on White-Light-Interferometry (WLI). In the first chapter, the technical background of the low-finesse …
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Miniature Microscope Design And Construction Based On Tilted Rotationally Asymmetric Printed Lenses
… high-brightness Light Emitting Diodes (LEDs) via multimode fiber. The design incorporated a custom imaging detector and a Micro-Electrical-Mechanical-Systems (MEMS) actuator for optical sectioning using structured illumination. The opto-mechanical system is designed using a new concept called …
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Design and measurements of novel electromagnetic properties in spiral transmission fibers
One dimensional photonic band gap fibers have proven to be fascinating and versatile devices, as demonstrated by many applications. The ability to control and design these fibers to achieve specific functionalities will enable us to advance the research done with these fibers and to gain new …
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Two Innovative Applications Combining Fiber Optics and High Power Pulsed Laser: Active Ultrasonic Based Structural Health Monitoring and Guided Laser Micromachining
This dissertation presents the exploration of two fiber optics techniques involving high power pulse laser delivery. The first research topic is "Embedded Active Fiber Optic Sensing Network for Structural Health Monitoring in Harsh Environments", which uses the fiber delivered pulse laser for …
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MIMO Communication Capacity: Antenna Coupling and Precoding for Incoherent Detection
… and MIMO performance of multi-mode optical fiber with non-linear detection. Superdirectivity can lead to abnormally large capacity bounds in a MIMO communication system, especially when the antennas are placed close together. Because superdirective behavior is difficult to achieve in …
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Development of Novel Instrumentations and Algorithms for Optical Screening of Epithelial Dysplasia
… opto-mechanical instrumentation using a single multimode fiber was presented to overcome the limiting factor of using fiber bundles for a/LCI imaging, as these fiber bundles are fragile, expensive, and exhibits low optical throughput. The technique was validated using microsphere phantoms, and …
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Site-controlled quantum dots as sources of quantum light
… platforms. As an example, integration over a multimode fiber is demonstrated as well as the emission of single-photons directly through the fiber.
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