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.
Results
Showing 1 to 19 of 19 for “"return-to-zero"”.
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A comparative study of synchronous and self-timed systolic array architectures.
This thesis examines systolic array architectures and their methods of control and communication synchronisation. Systolic array processors suffer from synchronisation problems associated with the clocking mechanism that causally restricts their scalability. To overcome this problem both …
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All-optical 2r regenerator based on self-phase modulation
… transmission distance. Optical 2R regenerators provide an effective way of coping with transmission impairments by restoring the quality of optical signals through re-amplification and reshaping (2Rs), thereby enabling reliable transmission over long distances. In this work, All-Optical 2R …
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Numerical modelling of advanced modulation formats and WDM transmission
… We then apply these optimisation methods to investigate spectral and temporal domain characteristics of advanced modulation formats in fibre optic telecommunication systems. Next we investigate numerical methods used in detecting and measuring the system performance of advanced modulation …
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Vertical-cavity surface-emitting laser (VCSEL) for 50Gb/s NRZ optical link in data center
… used in 100 m optical links with direct non-return-to-zero (NRZ) modulation has been limited to 25 Gb/s for years. At the same time, there is a tremendous growth of data traffic in data centers due to technology advances such as cloud computing. Therefore, it is important to develop …
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Continuous-Time Delta-Sigma Modulators for Wireless Communication
… rates in wireless communication require analog to digital converters (ADCs) with greater requirements on speed and accuracy, while being power efficient to prolong battery life. This dissertation contains an introduction to the field and five papers that focus on the continuous-time (CT) …
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Mathematical and numerical modelling of dispersion-managed solitons, autosolitons and self-similar optical pulses
… presents theoretical investigation of three topics concerned with nonlinear optical pulse propagation in optical fibres. The techniques used are mathematical analysis and numerical modelling. Firstly, dispersion-managed (DM) solitons in fibre lines employing a weak dispersion map are analysed …
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40Gbit/s dispersion managed soliton transmission
… in optical fibres before extending the arguments to optical solitons, their applications and uses in communications. Dispersion management for transmission systems is introduced and then a brief explanation of quasi-linear pulse propagation is given. Techniques for performing laboratory …
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Experimental Snap Loading of Synthetic Fiber Ropes
… is lost when a rope transfers from a slack state to a taut state. This transfer is called a snap load and can be very violent. It is proposed to use synthetic fiber ropes as a type of passive control device in new or existing structures to mitigate seismic response. Experimental static and snap …
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Improvement of Fiber Optic System Performance by Synchronous Phase Modulation and Filtering at the Transmitter
… the performance of a novel variant of a return-to-zero (RZ) modulation format, based on square-wave phase modulation and filtering of a continuous-wave (CW) signal, is investigated and compared with various modulation formats considered in the literature. We call this modulation format …
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Terahertz wireless communication
The goal of this thesis is to explore Terahertz (THz) wireless communication technology. More specifically the objective is to develop and characterize several THz communication systems and study the effect of atmosphere propagation through fog droplets and dust particles on THz communications. For …
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Terahertz wireless communication through atmospheric atmospheric turbulence and rain
… and spatially varying, it is difficult to obtain reproducible atmospheric conditions to verify results of independent measurements making it a challenge to measure and analyze the impact of outdoor atmospheric weather on communication links. Consequently, dedicated indoor weather …
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High-Speed Optical Modulators and Data Communication Systems in Silicon Photonics
Silicon photonics provides a promising platform for developing densely integrated, highly scalable and potentially very low cost solutions for various applications in the field of optical data communications. This thesis focuses on the technical challenges in silicon photonics on both the component …
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Near-field baseband communication system for use in biomedical implants
This thesis introduces the reader to the near-field baseband pulse radio communication for biomedical implants. It details the design and implementation of the complete communication system with a particular emphasis on the antenna structure and waveform coding that is compatible with this …
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Nonlinear applications of step-index and microstructured soft-glass fibres
… a very high nonlinearity.<br/><br/>With regard to holey fibre designs, small-core, compound-glass holey fibres with different core diameters and designs are considered for two different background materials: a commercially available lead-silicate glass and a bismuth-oxide based glass. Firstly, …
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All-semiconductor High Power Mode-locked Laser System
… The full characterization of 10-Gb/s RZ-BPSK (return-to-zero binary PSK) data has been demonstrated. Fast lockup and walk-off of the all-optical timing synchronization process on the order of nanoseconds were measured in both simulation and experiment. Phase stability of the recovered clock …
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Machine learning approach for high speed link modeling and IBIS-AMI model generation
… especially when taking nonlinearity into account. This work reports modeling the high-speed link (HSL) system using machine learning and implementing the model into IBIS-AMI, an industrial standard for SerDes simulation and verification. We started with developing a Volterra series …
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Some aspects of time-dependent one-dimensional random walks
This dissertation contains a study of related topics connected with the one-dimensional random walk which proceeds by steps of ±1 occurring at random time intervals. In general it is assumed that these intervals are identically and independently distributed. This model may be specialized to the …
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Toward an active CMOS electronics-photonics platform based on subwavelength structured devices
… with its high bandwidth and energy efficiency to further improve computing performance. Silicon photonics, compatible with CMOS platform manufacturing, presents a promising means to achieve on-chip optical links, employing highly sensitive microring resonator devices that demand electronic …
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Receivers for energy efficient optical interconnects
… increasingly deployed within the data centers to meet the growing bandwidth requirements. Both intensity modulation direct detection (IM-DD) optical links and coherent optical links are employed. The development of the optical interconnects is performed under tight power constraints due to …