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 18 of 18 for “"Space optics"”.
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Outage prediction modelling of terrestrial free space optics for tropical region
In modern times, Free Space Optical (FSO) communication technology has become an alternative way to radio links and optical cables. FSO links provide gigabit per second data rates and unlimited bandwidth, however its availability can easily be affected by fading due to different meteorological …
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A NOVEL DESIGN OF AN ALL-OPTICAL BISTABLE DEVICE USING A SINGLE ACTIVE ELEMENT
… implemented in two schemes, optical ber and free space optics. In both cases, the circuits are implemented by means of ring resonators and the aim is to conrm the bistability behavior predicted by theoretical analysis in the semiconductor active region.
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Free space optic communication for Navy surface ship platforms
Free Space Optics (FSO) technology is an alternative broadband technology, which provides fast, secure and reliable data transmission. The FSO systems are being used for commercial systems between fixed sites and are being considered for military systems because of their inherent benefits, which …
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Phase-space representation of digital holographic and light field imaging with application to two-phase flows
… are carried out under the framework of phase-space optics. In the holographic imaging system, it is seen that, by tracking the Space bandwidth transfer, the information transformation through a digital holographic imaging system can be traced. The inverse source problem of holography can be …
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Effective distribution of high bandwidth to the last mile
… Fiber Technology, Digital Subscriber Lines, Free Space Optics, Wireless Local Loop, Wireless LAN and Cellular Technology. Besides discussing the basic concepts and principles, it highlights the current limitations of these technologies for last mile implementation. An innovative and …
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Integrated broadband microphotonic beamformer for adaptive nulling in smart antennas
… signals (null steering), which is also known as Space Division Multiple Access (SDMA). SDMA systems allow significant improvement in the area of capacity, signal bandwidth, signal-to-interference ratio, and frequency reuse. Due to the increasing complexity of the smart antennas system, …
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Methodology and applications of topology optimization in nanophotonics
… structures, which expands the design space. We apply this broader form of topology optimization to different cases both in integrated photonics to design ultra-compact power splitters and polarization splitters, and in free-space optics to design chiro-optic devices. We also extend …
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Femtosecond fiber lasers at 1550 nm for high repetition rates and low timing jitter
… the fiber coupling was achieved through free space optics and the saturable absorbing mirror was also imaged through lenses. Once mode-locked, repetition rates of just beyond 1 GHz were demonstrated with this design; however the laser output was relatively low power. The second version coupled …
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Polarization multiplexed photonic integrated circuits for 100 Gbit/s and beyond
… Jones formalism, originally intended for free space optics, can be used to describe integrated waveguides on the micro-scale. Based on this formalism, an optimization technique is derived that lowers the sensitivity to fabrication errors by 25% and brings down theoretical optical losses from …
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Germanium on Silicon Integrated Photonics for the Mid-Wave Infrared
… a much smaller mass compared to existing free-space optics satellite lidar transmitter designs. The MWIR spectrometer has a predicted spectral resolution of 0.2 nm.
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Wireless personal area networks and free-space optical links
… infrared data association (IrDA) and free space optics (FSO). A model for the IrDA (indoor infrared) link layer is developed by considering the presence of bit errors. Based on this model, the effect of propagation delay on the link through put is investigated. An optimization study is also …
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Development of Precision, Field-Deployable, Opto-Mechanical Instrumentation: Accessibility as a Functional Requirement
… techniques and a combination of fiber and free space optics, the presented design reduces the total number and size of the required components, leading to a final system with a compact footprint. Such a system has the potential to expand the capabilities of quantum information research …
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Space-variant incoherent optical processing using color
Incoherent optical processing techniques offer superior noise immunity, among other benefits, over coherent optical processing techniques. However, the complex amplitude linearity exhibited by coherent optical systems that provides a natural means for performing operations on complex functions, is …
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Design of indoor communication infrastructure for ultra-high capacity next generation wireless services
… can be replaced with low-cost, broadband free-space optical links, termed radio over free-space optics (RoFSO) links. RoFSO links enable the implementation of very high density DAS without the need for prohibitively expensive cabling infrastructure. A 16m RoFSO link requiring only manual …
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Hybrid Opto-Electronic Processing Systems for Integer Multiplication
… is presented for integer multiplication in free-space opto-electronic systems. The scheme circumvents hardware constraints imposed by modern material and technology stacks. Without sacrificing numerical accuracy, the method reduces the modulation requirements for each spatial light modulator …
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Development of Optical Communication Terminals for Increasing Connectivity on Small Satellites
The development of free-space optical communication (FSOC) systems for space is key to enabling orders of magnitude more bandwidth and throughput for space communication systems. In addition, the recent developments in CubeSat technology can enable significant new small satellite capabilities. This …
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Multi-Transceiver Free-Space-Optical Structures for Mobile Ad-Hoc Networks
… model that is tessellated with multiple free-space-optical (FSO) transmitter and receiver (transceiver) pairs that exploit spatial reuse of the shared medium and are capable of handling extremely high data rates using optical modulation techniques. However, because of the highly directional …
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Diffraction-based Optical Architectures for Processing One-dimensional Data
… Using light as a fundamental resource, free-space optical computing and integrated photonic computing devices provide, respectively, powers of natural parallelism and miniaturisability. Recent work harnessing diffraction within slab waveguides has been proposed, on its face combining the best …