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 140 for “"optical communications"”.
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An optical communications link
… for, and prototypes of, an opto-electric voice communications link. The introductory sections deal with the generalised optical communications channel, the available hardware, and some of the research that has been done in the field. The information presented is used to motivate the type of …
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Synchronization In Advanced Optical Communications
… is to generate high power ultrashort optical pulses from an all-semiconductor mode-locked laser system. The limitations of semiconductor optical amplifier in high energy, ultrashort pulse amplification are reviewed. A method to overcome the fundamental limit of small stored energy …
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Optical communications for small satellites
… (LEO) is limited by the capabilities of the communications subsystem. Generally, these constraints stem from limited available electrical power, low-gain antennas and the general scarcity of available radio spectrum. In this thesis, we assess the ability of free space optical communication …
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Next generation optical communications for satellites
… technological and regulatory problems, laser communications has been identified as a key technology in leading a paradigm shift within satellite communications. When compared to traditional radio satellite communications, laser communication techniques show greater performance in terms of …
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Phase noise in coherent optical communications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1991.
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Atmospheric optical communications in the middle ultraviolet.
Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Optical communications with a Geiger mode APD array
… (GM-APD, or Geiger mode APD) array for use in optical communications systems. I designed and implemented a test pattern generator, capable of producing waveforms with OOK and PPM modulations at a variety of symbol rates and duty cycles. Using this pattern generator, I tested the receiver …
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Performance analysis for near-field atmospheric optical communications
… particularly in urban areas. Through-the-air optical communication systems are a reliable and cost effective alternative for establishing high data rate links when the two terminals have a clear line-of-sight. Bad weather conditions, such as rain, snow or fog, degrade performance severely for …
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Liquid Crystal Materials And Tunable Devices For Optical Communications
… in meeting the challenges for photonics and communications applications. The first part deals with polymer-stabilized liquid crystal (PSLC) materials and devices. Three polymer-stabilized liquid crystal systems are developed for optical communications. The second part reports the experimental …
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Scenario-based uncertainty quantification for deep space optical communications
… under uncertainty and explores the potential of optical communications to meet the future data requirements of deep space science missions. Currently, the Deep Space Network (DSN) relies solely on radiofrequency (RF) communications. As science-driven space exploration missions become more …
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Sensorless Wavefront Correction Algorithms for Free-Space Optical Communications
Free-space optical communications (FSOC) technology facilitates high-throughput wireless links across large distances with low size, weight, and power (SWaP) terminals. However, it is difficult to design reliable, low-cost FSOC terminals for long-range links through the atmosphere. Even in clear …
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Adaptive polarization mode dispersion equalizers for coherent optical communications systems
… (PMD) arises as a result of the birefringence in optical fibers, due to inherent asymmetries and deformities from external stresses. The spectral components of the input optical pulse propagate with different group velocities. Consequently, pulse duration increases leading to intersymbol …
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High speed nonlinear optical components for next-generation optical communications
… in cost, size and/or energy consumption. Optical signal processing techniques may be deployed in next-generation optical networks for simple tasks such as wavelength conversion, demultiplexing and format conversion at high speed (≥100Gb.s-1) to alleviate the pressure on existing core …
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Capacity of and coding for multiple-aperture, wireless, optical communications
… turbulence causes random power fluctuations in optical communication systems, making communication through the atmosphere difficult. This same phenomenon makes the stars twinkle at night, and pavement shimmer on a hot summer day. True to the old adage, "don't put all your eggs in one basket," we …
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Novel optical communications and imaging enabled by CMOS interfaced LED technology
… spatial and temporal modulation of an optical signal. Contacting micro-LED arrays to complementary metal-oxide-semiconductor (CMOS) electronics provides a mm-chip-scale device with a high level of control over the optical emission through digital input. Such devices enable novel forms …
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Tracking algorithms under boundary layer effects for free-space optical communications
Free-space optical communication requires accurate tracking to maintain links. The tracking problem between an aircraft and satellite becomes more difficult with the introduction of a turret on the aircraft for increased field-of-regard. In the case of a hemispherical turret, the disrupted airflow …
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Strategies for limiting interference and interception of free space optical communications
Free space optical systems provide an attractive solution to communication needs that require inexpensive, easily deployable links capable of high data rate transmissions. A major challenge of free space optical communication is ensuring the integrity and confidentiality of the transmitted …
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Processing of ultra-short optical pulses for high bit-rate optical communications
… linear pulse shapers into various all-optical signal processing devices for applications in high speed optical communication systems, to enhance the overall system performance, is investigated. The linear pulse shaping is performed using superstructured fibre Bragg gratings, which seem …
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Advanced Digital Signal Processing and Artificial Neural Networks in Modern Optical Communications
L'abstract è presente nell'allegato / the abstract is in the attachment
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