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 54 for “"Doped Fiber"”.
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Additive pulse mode-locked erbium-doped fiber lasers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Generation of pulsed dual wavelength erbium doped fiber laser
Single and dual wavelength fiber lasers and pulsed fiber lasers are well-known to be used for various applications. In the generation of dual wavelength fiber lasers and pulsed fiber lasers, the researchers found the mode competition among the dual wavelength is caused by the cross-gain saturation …
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Mode-locking of thulium-doped and Erbium-doped fiber lasers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Memristor Based Gain-Varying PI Control for Erbium-Doped Fiber Amplifiers (EDFAs)
In this research, the focus is on Erbium-Doped Fiber Amplifiers (EDFAs), crucial components in optical communication systems. Traditional control systems face challenges in control complexity and cost-effectiveness. This research addresses this challenge by introducing a novel …
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Remote temperature sensing with low-threshold-power using erbium-doped fiber laser
… appropriate action can be taken quickly. Optical fiber laser temperature sensor is one of technologies that can be used for the implementation of remote temperature sensing. Few developments have been reported regarding the use of fiber laser for remote temperature sensing. However, in general …
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Noise performance of erbium-doped fiber amplifiers with forward and reverse plumbing
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Optical distribution networks : signal-to-noise ratio optimization and distributed erbium-doped fiber amplifiers
… related to the use of remotely-pumped erbium-doped fiber amplifiers in optical distribution networks are analyzed. We investigate the optimal allocation of gain and loss among the stages of a lumped amplifier chain, using the concepts of a Nash solution and Pareto optimality. The propagation …
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High repetition rate mode-locked erbium-doped fiber lasers with complete electric field control
… describe the development of high repetition-rate fiber laser-based systems for the realization of these applications at 1550 nm wavelengths. To realize these systems, frequency comb sources are needed that are compatible with electric field stabilization techniques, are compatible with integrated …
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Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
Pulsed fiber laser has tremendous application in laser processing and laser sensor. The key element to produce a passively Q-switched fiber laser is by using a saturable absorber (SA). Passively Q-switched fiber laser is the most desirable pulse in laser technology due to its ability to generate …
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An analysis of cross grain saturation effects in systems of cascaded erbium-doped fiber amplifiers
… on amplifier gain, the composition of the erbium-doped fiber amplifier (EDFA) and its importance to optical networking and a discussion of the technique of wavelength division multiplexing (WDM). The chapter closes with a statement of the problem to be addressed in this thesis. Chapter 2 provides …
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Tools for quantum optics : pulsed polarization-maintaining Er-doped fiber laser and spatial mode manipulation in spontaneous parametric downconversion
… In one project, a pulsed, mode-locked erbium-doped fiber laser, designed to be used as a seed laser for a 390 nm source, was built using polarization-maintaining components to address polarization drift. The fiber laser operated at a center wavelength of 1560.0 nm with an output power of 1 to …
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The development of high power fibre chirped pulse amplification systems
… optical conversion efficiency, ytterbium (Yb)-doped silica fiber represents an attractive medium for the generation and amplification of ultrashort optical pulses. Research interest in Yb-doped fiber chirped pulse amplifier (CPA) systems first appeared in the late 1990s. However, the potential …
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Stimulated Brillouin scattering effects and suppression techniques in high power fiber amplifiers
… output power levels for high power ytterbium-doped dual clad fiber amplifiers. The overall objective of this effort is to develop and validate a predictive model to assist in the determination of the most effective techniques for increasing SBS thresholds within ytterbium-doped fiber …
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New techniques for multiple wavelength fiber laser generation based on edfa and tdfa
Multiple wavelength fiber laser (MWFL) can be a potential source for microwave generation as the conventional microwave generator have several issues in generating high frequency. In order to be such source, the MWFL must have the following criterion; a great number of comb lines, a compact design, …
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Analysis and modeling of phase noise in LOCSET and the AFRL high power fiber test bed
High power ytterbium doped fiber amplifier arrays in a master oscillator-power amplifier configuration and the phase noise in such a system is studied. An effective method of coherently combining the elements in such an array is LOCSET. A potential drawback to the effectiveness in LOCSET is the …
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Watt-class continuous wave Er3+/Yb3+ fiber amplifier
Rare-earth doped optical fibers can be used to make optical amplifiers in the near infrared with large optical gain in an all fiber based system. Indeed, erbium doped fibers made gain possible within the 1532 to 1560 nm band which makes long span fiber optical communication systems a possibility. …
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The study of acoustic properties of P205-doped silica fiber
Silica-based optical fibers have been applied to numerous fields. The interactions between acoustic phonons and the optical wave are involved in several of these applications. A significant stimulated scattering mechanism observed is stimulated Brillouin scattering (SBS), resulting in strong …
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STIMULATED BRILLOUIN SCATTERING SUPPRESSION VIA TEMPERATURE GRADIENTS IN FIBER AMPLIFIERS
… linewidth polarization maintaining ytterbium doped fiber amplifier is explored. The limiting factor, Stimulated Brillouin Scattering (SBS), is suppressed with a single-step temperature gradient. A similar fiber amplifier to the 177W amplifier is constructed and tested at various temperatures …
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CHARACTERIZATION OF DOPED GALLIUM NITRIDE SUBSTRATES
… the characteristics of five bulk semi-insulated doped gallium nitride samples provided by Kyma Technologies, Inc were explored. The five GaN samples were grown on sapphire substrates by hydride vapor phase epitaxy (HVPE) and doped with different concentrations of iron, hydrogen, carbon, oxygen …
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Real-time characterization of transient dynamics in thulium-doped mode-locked fiber laser
… pump power with a constant rate in an erbium-doped fiber laser, specifically the build-up and annihilation of soliton pulses between a double pulsing and a three-pulse state utilizing DFT. To investigate real-time laser dynamics in Tm based laser systems, we propose and develop a DFT system …
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