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 32 for “"Fiber Optic Communication"”.
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Low frequency cutoff effects in fiber optic communication systems
… system and gain instability of APD's to D.C. in fiber optic systems. Also, it is easier to design amplifiers that do not extend to D.C. The ISI which manifests itself in the form of baseline wander can cause appreciable degradation in the signal to noise ratio. This thesis investigates two ways …
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Current-Source DC-DC Converter for Fiber-Optic Communication Systems
… for powering sensors used in an underwater communications system is presented. The proposed converter steps down an input current of 0.9 A to 0.625 A, while maintaining an output voltage of 24 V and output power of 15 W. The complete steady-state analysis and design of the proposed converter …
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Linear Analog Front -End Circuits for Fiber -Optic Communication Systems
… electronic dispersion compensation based 10-Gb/s optical links. The design incorporates tunable emitter degeneration, hence satisfying linearity, bandwidth, and supply voltage requirements. Also, an analog multiplexer provides a wide gain tunability and enhanced linearity. The VGA achieves tunable …
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Tunnel filters and optical amplifiers for use in fiber optic communication systems
… phenomenon but that it occurs in classical optics as well. Single-layer and double-layer dielectrics in which optical tunneling occurs are shown to serve as the basis of optical filters, the double-layer tunnel filter having a much higher resolution capability than the single-layer tunnel …
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Analysis and modeling of the effects of reflection induced noise on the performance of fiber optic communication systems
Refractive index discontinuities in fiber optic transmission systems are known to cause deleterious effects. Non-negligible return losses associated with connectors and splices in present day systems cause intermittent error bursts and bit-error-rate floors in gigabit per second systems. These are …
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Optical Communication Systems for Smart Dust
In this thesis, the optical communication systems for millimeter-scale sensing and communication devises known as "Smart Dust" are described and analyzed. A smart dust element is a self-contained sensing and communication system that can be combined into roughly a cubic-millimeter mote to perform …
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Dispersive Estimates for the Schrodinger Equation
… consider the following equation that arises in fiber optic communication systems, iut+dtu xx+u2u=0. We can reduce this to a non-linear, non-local eigenvalue equation that describes the so-called dispersion management solitons. We prove that the dispersion management solitons decay exponentially …
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In-line Fiber Polarizer
… polarization devices are important components in fiber optic communication and sensor systems. There is a growing need for efficient low loss components that are compatible with optical fibers. An all fiber in-line polarizer is a more desirable alternative that could be placed at appropriate …
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A study of periodic gratings in planar dielectric waveguides
… becoming increasingly attractive to broadband fiber-optic communication systems.
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Theoretical Study of Semiconductor Quantum Dot Lasers with Asymmetric Barrier Layers
… studied. Semiconductor lasers are used in many communication systems. Fiber optic communication systems use semiconductor lasers in order to transmit information. DVD and Blu-ray disk players feature semiconductor lasers as their readout source. Barcode readers and laser pointers also use …
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Novel Segment Deformable Mirror Based Adaptive Attenuator Used In Wavelength Division Multiplexed Optical Communications Network
In wavelength division multiplexed (WDM) optical communication networks, signals are amplified periodically by optical amplifiers. Since the gain profiles of optical amplifiers are not flat, equalizers are usually used to maintain signal powers at different wavelengths in equal to avoid crosstalk …
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A circuit model BOSS simulation of nonlinear effects in long distance fiber optic systems
… nonlinearity limits the transmission distance of fiber optic communication systems. By designing a circuit that can model this effect and simulating it using the Block Oriented Systems Simulator (BOSS), we can study the pulse distortion and broadening that may occur. The nonlinearity considered …
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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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Transparent Asynchronous Transmitter Receiver Interface (TAXI) communications for fiber optic data links
… physical layer boundaries for point-to-point communication systems. However there exists a tradeoff between these two kinds of data transfer mechanisms based on their cost-effectiveness and complexity. A recent technological advancement has altered this trade-off considerations. A new chip-set …
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A Distributed Digital Control Architecture for Power Electronics Systems
… handles system control and monitoring functions. Communications between the hardware-oriented controller and the higher-level controller are implemented with the previously proposed 125 Mbits/sec daisy-chained fiber optic communication protocol. Real-time control and status data are communicated …
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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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A Synchronous Distributed Digital Control Architecture for High Power Converters
… reliable sensor measurements and converter communication and control. This thesis proposes a synchronous digital control architecture that allows for the communication and control of devices via a fiber optic communication ring using digital technology. The proposed control architecture is a …
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Multi-Channel Nonlinear Frequency Division Multiplexed Optical Transmission Systems
Fiber-optic communication systems form the backbone of today's global digital infrastructure. Driven by the continuous growth of data traffic, these systems face major challenges in meeting the ever-increasing demand for higher data rates. This work focuses on long-haul systems that achieve high …
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Optical pulse distortion and manipulation through polarization effects and chromatic dispersion
… shaping 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 …
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Variational Calculation of Optimum Dispersion Compensation for Nonlinear Dispersive Fibers
In fiber optic communication systems, the main linear phenomenon that causes optical pulse broadening is called dispersion, which limits the transmission data rate and distance. The principle nonlinear effect, called self-phase modulation, can also limit the system performance by causing spectral …
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