Chan Wai-Leung. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references. / Abstracts in English and Chinese. / ABSTRACT --- p.I / 摘要 --- p.III / Acknowledgements --- p.V / Table of Contents --- p.VII / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Different All-Optical Signal Processing Functions --- p.3 / Chapter 1.1.1 --- Periodic optical signal generation --- p.3 / Chapter 1.1.2 --- Optical clock recovery and clock synchronization --- p.4 / Chapter 1.1.3 --- Wavelength conversion and signal regeneration --- p.5 / Chapter 1.1.4 --- Optical multicasting --- p.6 / Chapter 1.1.5 --- All-optical time division multiplexing and demultiplexing --- p.6 / Chapter 1.2 --- SOA-MZI as the Prime Candidate --- p.7 / Chapter 1.3 --- Overview of the Thesis --- p.8 / References --- p.10 / Chapter 2 --- basic Properties of Semiconductor Optical Amplifier Based Mach-Zehnder Interferometer --- p.16 / Chapter 2.1 --- Semiconductor Optical Amplifier Based Mach-Zehnder Interferometer --- p.16 / Chapter 2.1.1 --- Characteristics of SOA-MZI --- p.17 / Chapter 2.2 --- Review on Different Reported Applications of SOA-MZI --- p.19 / Chapter 2.2.1 --- Format converter --- p.19 / Chapter 2.2.2 --- Mode-locked fiber ring laser --- p.20 / Chapter 2.2.3 --- OTDM ADD/DROP Multiplexer --- p.21 / Chapter 2.2.4 --- Optical Switch --- p.21 / References --- p.23 / Chapter 3 --- Self-Starting All-Optical Photonic Clock --- p.24 / Chapter 3.1 --- Introduction --- p.24 / Chapter 3.2 --- Principle of Photonic Clock Generation --- p.26 / Chapter 3.3 --- Basic Configuration --- p.27 / Chapter 3.3.1 --- Basic results --- p.28 / Chapter 3.3.2 --- Effects of state of polarization --- p.31 / Chapter 3.3.3 --- Effects of an isolator within the feedback loop --- p.34 / Chapter 3.3.4 --- Phase noise characteristics --- p.35 / Chapter 3.4 --- Multi-Loop Configuration --- p.36 / Chapter 3.4.1 --- Results examined in time domain --- p.38 / Chapter 3.4.2 --- Results examined in frequency domain --- p.38 / Chapter 3.4.3 --- More multi-loop results --- p.40 / Chapter 3.5 --- Other Proposed Scheme --- p.40 / Chapter 3.6 --- Summary --- p.43 / References --- p.44 / Chapter 4 --- All-Optical Clock Recovery --- p.46 / Chapter 4.1 --- Introduction --- p.46 / Chapter 4.2 --- Principle of All-Optical Clock Recovery --- p.47 / Chapter 4.3 --- Experiments Setup --- p.48 / Chapter 4.4 --- Clock Recovery Demonstration --- p.50 / Chapter 4.5 --- External Clock Synchronization Demonstration --- p.53 / Chapter 4.6 --- Summary --- p.55 / References --- p.56 / Chapter 5 --- Wavelength Conversion Optimization Using a Holding Beam --- p.57 / Chapter 5.1 --- Introduction --- p.57 / Chapter 5.2 --- Principle of Wavelength Conversion Under Injection of a Holding Beam --- p.58 / Chapter 5.3 --- Wavelength Conversion Using a Holding Beam --- p.62 / Chapter 5.4 --- Effect of a Holding Beam on Wavelength Conversion --- p.63 / Chapter 5.5 --- Optimizing the Effect of Holding Beam Assisted Wavelength Conversion --- p.67 / Chapter 5.6 --- Summary --- p.68 / References --- p.69 / Chapter 6 --- All-Optical Multicasting of Digital Signal with Format Conversion --- p.70 / Chapter 6.1 --- Introduction --- p.70 / Chapter 6.2 --- Principle of Switching-Wavelength Pulses Generation --- p.72 / Chapter 6.3 --- Principle of Multicasting Using SOA-MZI --- p.75 / Chapter 6.4 --- Experiment on Multicasting --- p.76 / Chapter 6.5 --- Performance of the Multicasting Scheme --- p.79 / Chapter 6.6 --- Summary --- p.84 / References --- p.85 / Chapter 7 --- Optical Demultiplexing for Time Division Multiplexed Data Source With Wavelength Conversion --- p.87 / Chapter 7.1 --- Introduction --- p.87 / Chapter 7.2 --- Principle of Optical Time Division Demultiplexing Using SOA-MZI --- p.90 / Chapter 7.3 --- Demonstration of Optical Time Division Demultiplexing --- p.91 / Chapter 7.4 --- Results and Discussions --- p.93 / Chapter 7.5 --- Summary --- p.96 / Chapter 8 --- Conclusion and Future Works --- p.100 / Chapter 8.1 --- Conclusions --- p.100 / Chapter 8.2 --- Future Works --- p.102 / Appendices --- p.A-1 / Appendix A. List of Publications --- p.A-1 / Appendix B. List of Figures --- p.A-2

Both gain transient and dynamic gain control devices were also designed and fabricated as photonic integrated circuits (PICs). Silicon-based PICs were able to perform dynamic gain tilt compensation by thermo-optic effect. Helium doped SOI rib waveguides were used for power monitoring and is potentially used as monolithic gain tilt compensation device with arrayed waveguide grating (AWG). / Dynamic gain tilt induced by wavelength dependent gain of EDFA leads to power penalty in wavelength division multiplexed systems. Using optical filter with known spectral response, it is possible to detect dynamic gain tilt and a per-band compensation scheme using electronic variable optical attenuators. This was implemented for dynamic gain tilt compensation (DGTC). / Dynamic provisioning of bandwidth and re-configurable optical networks can potentially allow efficient and cost effective deliveries of services based on the actual bandwidth requirement. Optical add/drop multiplexers (OADM) and optical cross-connects (OXC) will be used for such networks but the dynamic provisioning of optical channels may introduce optical power transients because of the slow gain dynamics of erbium doped fiber amplifiers. In this dissertation, the potential problems on using Erbium Doped Fiber Amplifiers (EDFA) in future reconfigurable optical networks are studied and possible solutions are assessed. In particular, the problems of gain transient and dynamic gain tilt were studied experimentally and theoretically. / In saturated EDFA channel add/drop can produce average power fluctuations, in timescales in the microsecond range. The thesis describes how gain transients can be minimized in gain clamped EDFA by optimizing erbium concentrations of EDF. Both simulations and experiments demonstrate that highly doped EDF minimize the transient in gain clamped EDFA. For unclamped EDFA, all-optical feedforward constant output power compensation has been successfully demonstrated using electronic variable optical attenuator (EVOA). / Chan Po Shan. / "August 2006." / Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1813. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2007. / Title from title screen (site viewed Dec. 5, 2007). PDF text: xi, 166 p. : ill. ; 9 Mb. UMI publication number: AAT 3273922. Includes bibliographical references. Also available in microfilm and microfiche formats.

<p>Measurements are important to specify and verify properties for components, modules and systems. The specifications for a certain figure of merit are usually given in a numerical value or a two dimensional plot. However, there are some devices, like power amplifiers with certain figure of merits that depends on two or more working conditions, requiring a three dimensional plot.</p><p>This thesis presents a measurement method including graphical user interface of three parameters gain, efficiency and distortion when two-tone or WCDMA signals are used as an input to the PA.</p>

The importance of spectral efficiency in mobile communications often requires the use of non-constant-envelop linear digital modulation schemes. These modulation techniques carry signal information in both magnitude and phase, thus they must be linearly amplified to avoid nonlinear signal distortion which is not correctable in a typical receiver. A second difficulty in utilizing these modulation formats is that nonlinear amplification generates out-of-band power (spectral regrowth). Therefore, to achieve both high energy efficiency and spectral efficiency, some forms of linearization must be used to compensate for the nonlinearity of power amplifiers. One powerful technique that is amenable to monolithic integration is digital signal predistortion. Most predistorters try to achieve the inverse nonlinear characteristic of High Power Amplifier(HPA). In this thesis a new multi-stage digital adaptive signal predistorter is presented. The scheme is developed from the direct iterative method with low memory requirement proposed by Cavers [1] in combination with the multi-stage predistortion proposed by Stonick [2]. To make the predistorter more compact a very simple and fast method called the complementary method is proposed. The complementary method has prominent advantages over other digital predistorters in terms of stability of the algorithm, complexity of the algorithm and computational load. / Graduation date: 2001

Advancements in the sophistication and complexity of modern electronic systems are creating a need for highly integrated systems with ever higher operational frequencies. The economical demands of these systems dictate that they be implemented using low cost fabrication technologies, such as digital CMOS. One of the major challenges facing circuit designers is the difficulty in implementing high frequency RF analog circuits on these types of technologies. Analog circuits which make use of parasitic-laden components such as inductors are especially difficult to realize. The purpose of this thesis is to investigate the design and application of an optimization tool based on simulated annealing to this type of problem. The goal is to have the optimizer incorporate these unavoidable component parasitics into a design, and thus eliminate any undesirable performance degradation. The optimization technique will be applied to the design of a CMOS RF distributed amplifier. This type of amplifier has a flat gain characteristic over an exceptionally wide bandwidth, and it is heavily reliant on inductive structures. Historically, an amplifier of this type has never been implemented on a standard CMOS process, without the use of bondwire inductances or special processing techniques. However, it will be shown in this thesis that, with the aid of the optimization technique, a distributed amplifier design can be successfully realized on a standard CMOS process. / Graduation date: 1999

The feasibility of developing test circuits to perform in-circuit testing of analog circuits is investigated in this thesis. A modular approach to analog testing has been adopted. Accordingly, the testing of an operational amplifier, which is a basic building block in analog circuits, is addressed. One convenient technique for measuring the frequency response of an op-amp requires a unity gain buffer to be inserted into its feedback loop. This buffer has to be simple in construction, small and accurate. Two buffer circuits that satisfy these requirements are described in this thesis. Enhanced slewing techniques are devised to achieve increased levels of performance. The buffers were integrated with an op-amp into a test chip. Digital logic is used to provide controllability and accessibility to each of the buffers and the op-amp so that they can characterized separately. The performance of the enhanced slewing buffers was verified with measurements performed on the test chip. The performance of the buffers conformed well with the simulated values. The buffers exhibited excellent settling times even while driving large capacitive loads. Their output swing and distortion performance were good for inputs as large as 2 V peak-to-peak values. / Graduation date: 1994

No description available.

M.W.P. Strandberg. / 3668776 Archives / Reprinted from Physical review, v. 106, p. 617-620, May 15, 1957. "June 26, 1959"--Cover. / Army Signal Corps Contract DA36-039-sc-78108. Dept. of the Army Task 3-99-20-001 and Project 3-99-00-000.

Benjamin J. Leon. / 3668602 Archives / Based on a thesis, M.I.T. Dept. of Electrical Engineering, April 15, 1959. "June 5, 1959." Also published as Group report 46-59, Lincoln Laboratory, M.I.T., April 6, 1959. / Bibliography: p. 52. / DA36-039-sc-78108. Task 3-99-20-001 and Project 3-99-00-000.