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 13 of 13 for “"Optical Communication System"”.
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Designing a wireless underwater optical communication system
… modems have long been the default wireless communication method for underwater applications due to their long range, the need for high speed communication has prompted the exploration of non-acoustic methods that have previously been overlooked due to their distance limitations. One scenario …
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Source and channel coding for low-bandwidth speech communication between optoelectronic devices
Optical communication is one solution to the communication problem that many military forces face in today's urban environments. The recent advances in optoelectronic fibers by the Photonic Bandgap Fibers and Devices Group allow optoelectronic fibers to be woven into standard military equipment. …
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A line-of-sight voice communication system with optoelectric fibers
… the electronic hardware for a vest-mounted voice communication system that could incorporate such fibers. In this thesis, I explored initial designs for a receiver circuit and fully developed a head-mounted infrared transmitter module. As optoelectric fibers with sufficient sensitivity and …
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Optoelectronic fiber interface design
… have been produced in these fibers including optical sensors, thermal sensors and even transistors. The use of these fiber devices in a variety of applications was explored. A large-scale, lensless imager, an optical communication system, a thermal sensing array and a logic gate were designed …
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Dynamic pixel selection in free-space photon-counting optical communication systems for the exploitation of excess channel capacity
Atmospheric turbulence in free-space optical communications turns signal demodulation and decoding into a multimode problem as wavefronts of the transmitting laser beams are warped spatially past the desired form of a diffraction-limited spot at the receiver end of a free-space optical receiver. …
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High speed photodiode and 90° optical hybrid for 2 µm optical communication systems
… saturation around 1.55 µm, the next generation optical networks require technological developments in new wavelength regions. This will not only extend the current effective transmission band but also address limitations such as loss and non-linearity of silica-core fibers. The waveband at 2 µm …
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New d-piso architecture for dynamic symbol size digital baseband modulation implementation in FPGA
… symbol size digital baseband modulation for optical communication system in FPGA hardware design. KCU105 FPGA development board and Vivado software were chosen as the main platform to implement the design. A new architecture to implement dynamic symbol size baseband modulation in FPGA is …
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Importance sampling simulation of free-space optical APD pulse position modulation receivers
Free-space optical communication technology has many advantages over RF/microwave in satellite and other spacecraft applications where reductions in size, weight and prime power requirements are combined with increased data transfer capability over long distances. Ultimately, the design and …
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Characterization of the Dynamics of Optically-Injected Nanostructure Lasers
… and most compact approach to pass data onto an optical fiber; however, their intrinsic limitations under direct-modulation such as wavelength chirp and inherent relaxation oscillation frequency constraints impede their high-speed and long-distance capabilities. The injection-locking of …
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Digital equalization techniques for the compensation of nonlinear impairments in long-haul coherent optical communication systems
… the commercialization by Nortel of coherent optical communications digital transceivers operating at 40 Gb/s using Differential Phase Shift Keying (DPSK) revolutionized the field of fiber-optic communications because it provided superior spectral efficiency compared to the state-of-the-art …
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Analytical and computational methods for the study of rare event probabilities in dispersive and dissipative waves
… events in nonlinear, large-dimensional lightwave systems that are driven by noise, including models for fiber-based optical communication system and mode-locked lasers. Throughout the last decade, IS has emerged as a valuable tool for improving the efficiency of simulating rare events in such …
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Investigation of High-Nonlinearity Glass Fibers for Potential Applications in Ultrafast Nonlinear Fiber Devices
… response time and potential applications in optical communication systems. They usually require long fibers to generate sufficient nonlinear phase shifts, since nonlinearities of conventional silica-core silica-clad fibers are too low. These long devices, however, cause the serious problems …