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 23 for “"fiber communication"”.
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Traffic control in a multichannel optical fiber communication network
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
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Multi slot amplitude coding technique for high speed optical fiber communication system
The rapid progress of the high speed optical communications system is driven by the exponential growth of users demand on information and services. The trend towards high speed and high capacity transmission system are multiplexing technique such as electrical time division multiplexing (ETDM) and …
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Quantum well devices fabricated using selective area growth and their application in optical fiber communication
In this thesis we discuss the advantage of the selective area growth (SAG) approach to manufacturing integrated quantum-well lasers and modulators. SAG can be successfully achieved with two major growth techniques: metalorganic chemical vapor deposition (MOCVD) and molecular beam epitaxy (MBE). We …
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Influence of the Number of Degrees of Freedom on the Capacity of Incoherent Optical Fiber Communication Systems
… is to find the channel capacity in optical fiber communication systems when incoherent detection is used with single (polarization filtering) and two-polarizations (no polarization filtering). Optical fiber systems employ photodetectors that convert optical intensity to electrical current. …
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Vapor Phase Epitaxial Growth of Gallium Arsenide, Indium Phosphide, and Indium Gallium Arsenide by the Hydride Technique
The use of InGaAsP alloys for optical fiber communication systems is discussed. The advantages and various types of vapor phase epitaxial growth systems are examined before looking at the open tube growth process in detail. Using the criteria for high purity systems, which are thoroughly reviewed, …
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Controlled optical soliton propagation using theoretical tunable dispersion fibers
The increased demand for high bandwidth communication channels has raised significant interest in overcoming the data rate limitations of fiber communication systems. In this thesis a solution is proposed: controlled soliton propagation. This solution requires the use of new technology in the form …
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Transimpedance Amplifier (TIA) Design for 400 Gb/s Optical Fiber Communications
Analogcircuit/IC design for high speed optical fiber communication is a fairly new research area in Dr. Ha's group. In the first project sponsored by ETRI (Electronics and Telecommunication Research Institute) we started to design the building blocks of receiver for next generation 400 Gb/s optical …
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Measurements, analysis and modeling of the performance of direct detection receivers with an optical preamplifier
In the last few years, erbium-doped fiber amplifiers (EDFAs) have been investigated extensively both for their superior amplification characteristics and their applicability to future optical fiber communication systems. In the preamplifier configuration, a bandpass filter is required to reduce the …
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Increasing the survivability of long distance fiber optic networks
The issue of protecting a fiber communication system is of considerable concern mainly because of the fiber's capability of carrying a large amount of traffic. In this study, we are concerned with the role of topology in relation to the survivability and network cost. Studying three simple network …
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Coupled-waveguide Fabry-Perot resonator
… filters find important applications in optical fiber communication systems, particularly in wavelength demultiplexers and single-frequency semiconductor lasers. Conventional Fabry-Perot resonators provide a narrow spectral width but lack the capability of mode discrimination. A new …
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Monolithic Integration of Long Wavelength Photodetectors and High Electron Mobility Transistors on Metamorphic Gallium Arsenide Substrates
… GaAs substrates for long-wavelength optical fiber communication applications. The use of a novel double heterostructure employing an InGaAlAs optical impedance matching layer, a chirped InGaAs/InAlAs superlattice graded bandgap layer (SL-GBL), and a large bandgap I-InAlAs drift region enabled …
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Optical Enhancement in Periodic Plasmonic Gratings for SERS and Metal-Semiconductor-Metal Photodetectors (MSM-PDs) Applications
… charge-coupled devices (CCD), and optical-fiber communication systems. Several parameters, wire widths and thickness, gap space, taper angle, and the incident wavelength and angle, were investigated. The goal of this research is to utilize the plasmonic phenomenon by using plasmonic …
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Optical pulse distortion and manipulation through polarization effects and chromatic dispersion
… mechanisms play a significant role in optical fiber communication and sensing. In this thesis we shall investigate techniques which alleviate pulse deterioration due to polarization effects, and utilize large chromatic dispersion for system performance enhancement. We first demonstrate a method …
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High resolution measurement of telecommunication component polarization mode dispersion by means of quantum interferometry
… (PMD) in order to deliver optimal performance in fiber-optic communication systems. Telecommunication service providers need their system vendors to match the performance of their platforms to the overall system PMD accumulation, including both fiber and component PMD. The fiber PMD is a …
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Analysis, Design and Performance Evaluation of Optical Fiber Spectrum-Sliced WDM Systems
… (WDM) in optical fiber systems. Conventional WDM systems employ laser diodes operating at discrete wavelengths as carriers for the different data channels that are to be multiplexed. Spectrum-slicing provides an attractive low-cost alternative to the use of multiple …
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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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Survivability and resilience mechanisms in modern optical fibre systems
… networks play an increasingly prominent role in communications. As networks grow in size and complexity, the probability and impact of failures increase. In this dissertation, different optical network concepts, survivability and resilience methods are considered. Link and Path failures are …
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Improvement of Fiber Optic System Performance by Synchronous Phase Modulation and Filtering at the Transmitter
… pulse train, which is shown to be resistant to fiber dispersion. The alternate-sign RZ pulse train is then amplitude modulated with the data before the transmission. Alternate signs between adjacent pulses makes this signal format robust to impairments caused by the optical fiber, similar to a …
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Flexible Polymer Waveguides for High-Speed Short-Reach Links
… polymer waveguides for used in short-reach communication links. Flexible polymer waveguides enable a wider range of applications as compared to the rigid polymer waveguides, especially for the rack-to-rack links and data bus systems in autonomous car and avionic industry. However, their …
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