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Bandwidth limitation of conventional electrical demultiplexer restricts the data capacity of long-haul optical time division multiplexing (OTDM) systems. It is desirable to demultiplex the OTDM signal in optical domain, thereby lifting the bandwidth limitation of the electrical demultiplexer. The general principle of all-optical time division demultiplexing is to effect asymmetric changes to the optical properties of the target and non-target channels. The different optical properties of the target and non-target channels facilitate the separation of the target channel(s) from the aggregate OTDM signal. The change of optical properties of the OTDM signal can be achieved by exploiting various types of nonlinear optics effects, such as cross-phase modulation and four-wave mixing. Although the technical viability of all-optical demultiplexing has been successfully demonstrated in laboratories, there is still a lack of understanding regarding the noise and crosstalk characteristics of all-optical demultiplexers. This PhD study attempts to investigate noise and crosstalk performance of two types of all-optical time division demultiplexers, namely nonlinear optical loop mirror (NOLM) and terahertz optical asymmetric demultiplexer (TOAD). In order to evaluate the noise and crosstalk performance of NOLM and TOAD demultiplexers, mathematical models are developed to simulate the transmission window for demultiplexing the target channel. The shape of the transmission window is dependent on the device parameters of the demultiplexers. Varying input parameters of the mathematical models can simulate the effects of changing device parameters on the transmission window. Nevertheless, it is onerous to calculate transmission windows for infinite combinations of device parameters. To simplify the noise and crosstalk analysis, device parameters of NOLM and TOAD demultiplexers are optimised for maximising the peak of the transmission windows. Noise and crosstalk models are also developed forNOLM and TOAD demultiplexers. The optimised device parameters of NOLM and TOAD demultiplexers are fed into the noise and crosstalk models for analysis. Simulation results show that a tradeoff between noise and crosstalk exists for the two types of demultiplexers. Device parameters can be optimised to minimise either noise or crosstalk, but not both. Finally, the noise and crosstalk models are connected to a receiver model, where the bit-error-rate (BER) performance of OTDM systems is evaluated. The BER performances of the NOLM and TOAD demultiplexing are compared using the optimised device parameters. It is found that TOAD has a slightly better BER performance compared with NOLM for lower baseband bit rate (i.e. a larger number of OTDM channels for an aggregate bit rate).

Thesis (M. Sc.)--University of Alberta, 2009. / Title from PDF file main screen (viewed on Feb. 19, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science, Department of Computing Science, University of Alberta. Includes bibliographical references.

Thesis (M.S.)--University of Missouri-Columbia, 2004. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (June 30, 2006) Vita. Includes bibliographical references.

No description available.

International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada / In order to reduce the measuring channels for the single-transient signals, the author propose the time division multiplex technique and introduce the method of SAW delay line in this paper. That used method of SAW tap-delay line in this system is different from previous methods consists in making traditional method, which is one-path signal input different delayed multi- path signals output, alter new method, which is simultaneous multi-path signal inputs that are respectively delayed and one-path signal serial output.

Zhao Jian. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2004. / Includes bibliographical references (leaves 61-68). / Abstracts in English and Chinese. / Chapter 1. --- INTRODUCTION --- p.1 / Chapter 1.1. --- Applications Background - wdm Transmission Systems --- p.1 / Chapter 1.1.1. --- Long-haul WDM Transmission Systems --- p.3 / Chapter 1.1.2. --- OTDM/WDM Transmission Systems --- p.4 / Chapter 1.2. --- Spectrum-slicing Multi-wavelength Sources --- p.6 / Chapter 1.3. --- Introduction of Super-continuum Generation --- p.9 / Chapter 1.4. --- Outline of this Thesis --- p.13 / Chapter 2. --- PRINCIPLES OF SUPER-CONTINUUM GENERATION --- p.15 / Chapter 2.1. --- Super-continuum in Anomalous Dispersive Fiber --- p.17 / Chapter 2.2. --- Super-continuum in Dispersion Decreasing Fiber --- p.21 / Chapter 2.3. --- super-continuum in normal dispersive fiber --- p.23 / Chapter 2.4. --- Super-continuum in Dispersion Flattened and Dispersion Decreasing Fiber --- p.25 / Chapter 2.5. --- Conclusions --- p.27 / Chapter 3. --- OPTIMAL ANALYSIS OF SUPER-CONTINUUM SOURCES OPERATING IN NORMAL DISPERSIVE FIBERS --- p.29 / Chapter 3.1. --- Numerical Model --- p.31 / Chapter 3.2. --- Broadened Spectrum Width --- p.33 / Chapter 3.2.1. --- Broadened Spectrum Width without High-order Dispersion and High-order Nonlinearities --- p.33 / Chapter 3.2.2. --- Influence of High-order Dispersion and High-order Nonlinearities --- p.37 / Chapter 3.3. --- Quality of the Pulses Sliced from SC Spectrum --- p.40 / Chapter 3.3.1. --- Principles --- p.40 / Chapter 3.3.2. --- Influence of Some Parameters on the System Performance of SC Sources --- p.49 / Chapter 3.3.2.1. --- Influence of N --- p.49 / Chapter 3.3.2.2. --- Influence of the Slicing Filter Width --- p.52 / Chapter 3.3.2.3. --- Influence of the Input Peak Power --- p.55 / Chapter 3.4. --- Conclusions --- p.57 / Chapter 4. --- SUMMARY AND FUTURE WORK --- p.59 / BIBLIOGRAPHY --- p.61 / APPENDIX-PUBLICATIONS --- p.68

Lee, King Ho. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2008. / Includes bibliographical references (leaves 69-72). / Abstracts in English and Chinese. / Abstract --- p.i / Acknowledgement --- p.iii / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Introduction to Wireless Technologies --- p.1 / Chapter 1.2 --- Wireless Systems --- p.2 / Chapter 1.3 --- Wireless Networks --- p.3 / Chapter 1.4 --- Multiple Access --- p.5 / Chapter 1.5 --- Objectives and Outlines of the Thesis --- p.8 / Chapter 2 --- Background Studies --- p.9 / Chapter 2.1 --- Introduction of Scheduling Models of Wireless Networks (Graph-based and Interference-based) --- p.10 / Chapter 2.2 --- Power Assignment in Interference-based Schedul- ing Model --- p.12 / Chapter 2.3 --- Motivation and Contribution --- p.14 / Chapter 3 --- Model --- p.16 / Chapter 4 --- Nonlinear Power Assignment Scheduling Algorithm --- p.22 / Chapter 4.1 --- Nonlinear Power Control Scheduling Algorithms --- p.22 / Chapter 4.2 --- Low-Disturbance Scheduling Protocol --- p.26 / Chapter 4.3 --- Fundamental Limitation of LDS --- p.28 / Chapter 4.4 --- Chapter Conclusion --- p.31 / Chapter 5 --- Step-Establishing Algorithm --- p.33 / Chapter 5.1 --- Step-Establishing Algorithm --- p.33 / Chapter 6 --- "Performances of LDS, SRA, and SEA" --- p.45 / Chapter 6.1 --- Simulation --- p.45 / Chapter 6.2 --- Exponential Chain Topology --- p.46 / Chapter 6.3 --- Fixed-Transmission-Length Random Network --- p.47 / Chapter 6.4 --- Cluster Chain Topology --- p.50 / Chapter 6.5 --- General Random Network --- p.53 / Chapter 6.6 --- Running Time Complexity --- p.55 / Chapter 7 --- Conclusion --- p.60 / Chapter A --- Step-Removal Algorithm --- p.62 / Chapter A.1 --- Step-Removal Algorithm[1] --- p.62 / Chapter A.2 --- Illustration of the efficiency of SRA --- p.63 / Chapter B --- Low-Disturbance Scheduling Algorithm --- p.65 / Chapter B.1 --- Low-Disturbance Scheduling Algorithm --- p.65

Shen, Yuxiu. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (leaves 61-64). / Abstracts in Chinese and English. / 摘要........Error! Bookmark not defined / Abstract --- p.iii / Acknowledgement --- p.v / Content --- p.viii / List of Figures --- p.xi / List of Tables --- p.xii / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Background Overview --- p.1 / Chapter 1.2 --- Motivation and Related Work --- p.2 / Chapter 1.3 --- Our Contribution --- p.3 / Chapter 1.4 --- Organization of the Thesis --- p.5 / Chapter Chapter 2 --- Preliminaries --- p.6 / Chapter 2.1 --- TDMA Technology --- p.6 / Chapter 2.1.1 --- Features of TDMA --- p.8 / Chapter 2.2 --- Previous Study on TDMA Link Scheduling --- p.8 / Chapter 2.3 --- Typical Network and Interference Models --- p.10 / Chapter Chapter 3 --- System Model --- p.14 / Chapter 3.1 --- Physical Layer Interference Model --- p.14 / Chapter 3.2 --- Objective of the Problem --- p.15 / Chapter 3.3 --- Rate Matrices for Transmission Sets --- p.17 / Chapter 3.4 --- Airtime Allocation --- p.19 / Chapter Chapter 4 --- Problem Formulation and Its Solution --- p.20 / Chapter 4.1 --- LP Formulation of Optimal TDMA Link Scheduling --- p.21 / Chapter 4.2 --- Solution to the Optimal Air Time Allocation Problem --- p.22 / Chapter 4.3 --- n-length Chain Network --- p.24 / Chapter 4.3.1 --- Adaptive Rate Transmission --- p.25 / Chapter 4.3.2 --- Fixed Rate Transmission --- p.27 / Chapter Chapter 5 --- Bad Transmission Set Removal Algorithm (BTSR) --- p.30 / Chapter 5.1 --- A 7-node Chain Example --- p.30 / Chapter 5.2 --- BTSR Algorithm --- p.32 / Chapter Chapter 6 --- Randomized Decentralized Scheduling Algorithm (RDSA) --- p.35 / Chapter 6.1 --- RDSA Algorithm --- p.35 / Chapter 6.2 --- Pseudo Code of RDSA --- p.37 / Chapter 6.3 --- The Flow Chart of RDSA --- p.39 / Chapter Chapter 7 --- Performance Evaluation --- p.41 / Chapter 7.1 --- Performance of Cross-layer TDMA Link Scheduling --- p.41 / Chapter 7.2 --- Complexity Analysis and Comparisons for BTSR+LP and LP --- p.46 / Chapter 7.2.1 --- Complexity of LP Problem --- p.47 / Chapter 7.2.2 --- Problem Size Reduced by BTSR --- p.48 / Chapter 7.2.3 --- Revised BTSR Algorithm --- p.49 / Chapter 7.2.4 --- The Complexity Issues --- p.51 / Chapter 7.3 --- Performance and Complexity Issues for RDSA --- p.52 / Chapter Chapter 8 --- Conclusion and Future Work --- p.57 / Chapter 8.1 --- Conclusions --- p.57 / Chapter 8.2 --- Future Work --- p.58 / Bibliography

Photonic crystals (PCs) are nano-structured materials in which a periodic variation of the dielectric constant of the material results in a photonic band gap. By introducing defects into PCs, it is possible to build waveguides that can channel light along certain paths. It is also possible to construct micro-cavities that can localize photons in extremely small volumes. In this dissertation, to begin with, we computed the photonic crystals dispersion relations and found the photonic band gap (PBG) by the plane wave expansion method (PWE) in the frequency domain. Then, the finite difference time domain method (FDTD) along with the perfectly matched layer boundary conditions was adopted to solve Maxwell¡¦s equations, equivalent to simulate the movement behavior of the Photonic crystals. By properly varying the size of the defect on the PCs, it could really drop the particular wavelengths and guide them to output channels by PCs waveguides. We proposed the structures that would function as Wavelength-Division-Multiplexer (WDM). Secondly, coupled cavity waveguide of PC was used to control group velocity that achieved the slow light property. By calculating dispersion curve with PWE, we obtained group velocity characteristics in PCs waveguide. Meanwhile, we designed a novel Time-Division-Multiplexer (TDM) system by controlling the group velocity characteristics. Finally, we designed cascade ring resonators and expected to obtain an extendable delay line. Conventional delay line devices are propagating in a long waveguide to obtain the delay line property. An excellent delay line and ultra-small size properties are expected in the proposed structure. Because nano-technology has been making great progress steadily, it surely can be used to demonstrate a practical breakthrough in which the devices based on the PC integrated circuits are realized. These devices will be a potential key component in the applications of ultra-high-speed and ultra-high-capacity optical communications and optical data processing systems.