All-optical signal processing. In current and future optical communication systems and networks, the data rate per wavelength has been approaching the speed limitation of electronics. Thus, all-optical signal processing techniques are highly desirable to support the necessary optical switching functionalities in future ultrahigh-speed optical packet-switching networks. To cope with the wide use of optical phase-modulated signals, in the thesis, an all-optical logic for DPSK or PSK input signals is developed, for the first time. Based on four-wave mixing in semiconductor optical amplifier, the structure of the logic gate is simple, compact, and capable of supporting ultrafast operation. In addition to the general logic processing, a simple label recognition scheme, as a specific signal processing function, is proposed for phase-modulated label signals. The proposed scheme can recognize any incoming label pattern according to the local pattern, and is potentially capable of handling variable-length label patterns. / In recent years, optical phase modulation has attracted much research attention in the field of fiber optic communications. Compared with the traditional optical intensity-modulated signal, one of the main merits of the optical phase-modulated signal is the better transmission performance. For optical phase modulation, in spite of the comprehensive study of its transmission performance, only a little research has been carried out in terms of its functions, applications and signal processing for future optical networks. / Optical access network with multicast overlay and centralized light sources. In the arena of optical access networks, wavelength division multiplexing passive optical network (WDM-PON) is a promising technology to deliver high-speed data traffic. However, most of proposed WDM-PONs only support conventional point-to-point service, and cannot meet the requirement of increasing demand on broadcast and multicast service. In this thesis, a simple network upgrade is proposed based on the traditional PON architecture to support both point-to-point and multicast service. In addition, the two service signals are modulated on the same lightwave carrier. The upstream signal is also remodulated on the same carrier at the optical network unit, which can significantly relax the requirement on wavelength management at the network unit. / Optical time-division multiplexing and demultiplexing. With the ever-increasing demand on communication bandwidth, optical time division multiplexing (OTDM) is an effective approach to upgrade the capacity of each wavelength channel in current optical systems. OTDM multiplexing can be simply realized, however, the demultiplexing requires relatively complicated signal processing and stringent timing control, and thus hinders its practicability. To tackle this problem, in this thesis a new OTDM scheme with hybrid DPSK and OOK signals is proposed. Experimental investigation shows this scheme can greatly enhance the demultiplexing timing misalignment and improve the demultiplexing performance, and thus make OTDM more practical and cost effective. / These issues are systematically investigated in this thesis. The research findings suggest that optical phase modulation and its signal processing can greatly facilitate flexible network functions and high bandwidth which can be enjoyed by end users. In the thesis, the most important physical-layer technology, signal processing and multiplexing, are investigated with optical phase-modulated signals. Novel and advantageous signal processing and multiplexing approaches are proposed and studied. Experimental investigations are also reported and discussed in the thesis. / Deng, Ning. / "August 2007." / Adviser: Calvin Chun-Kit Chan. / Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 1196. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (p. 119-127). / 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. / Abstract in English and Chinese. / School code: 1307.

Chromatic dispersion (CD) is due to the fact that light with different frequencies travel at different speeds inside fiber. It causes pulse spreading and intersymbol interference (ISI) which would severely degrade the transmission performance. By feeding a signal into a fiber loop which consists of a high-birefringence (Hi-Bi) fiber, we experimentally show that the amount of experienced dispersion can be deduced from the RF power at a specific selected frequency which is determined by the length of the Hi-Bi fiber. Experimental results show that this technique can provide high monitoring resolution and dynamic range. / Polarization mode dispersion (PMD) splits an optical pulse into two orthogonally polarized pulses traveling along the fiber at different speeds, causing crosstalk and ISI. The third part of the thesis demonstrates two different PMD monitoring schemes. The first one is based on the analysis of frequency-resolved state-of-polarization (SOP) rotation, with signal spectrum broadened by self-phase modulation (SPM) effect. Experimental results show that the use of broadened signal spectrum induced by SPM not only relaxes the filter requirement and reduces the computational complexity, but also improves the estimation accuracy, and extends the monitoring range of the pulsewidth. The second one is based on the delay-tap asynchronous waveform sampling technique. By examining the statistical distribution of the measured scatter plot, unambiguous PMD measurement range up to 50% of signal bit-period is demonstrated. / The final part of the thesis focuses on the monitoring of alignment status between the pulse carver and data modulator in an optical system. We again employ the two-tap asynchronous sampling technique to perform such kind of monitoring in RZ-OOK transmission system. Experimental results show that both the misalignment direction and magnitude can be successfully determined. Besides, we propose and experimentally demonstrate the use of off-center optical filtering technique to capture the amount of spectrum broadening induced by the misalignment between the pulse-carver and the data modulator in RZ-DPSK transmission system. The same technique was also applied to monitor the synchronization between the old and the new data in synchronized phase re-modulation (SPRM) system. / The tremendous increase of data traffic in the worldwide Internet has driven the rapid development of optical networks to migrate from numerous point-to-point links towards meshed, transparent optical networks with dynamically routed light paths. This increases the need for appropriate network supervision methods. In view of this, optical performance monitoring (OPM) has emerged as an indispensable element for the quality assurance of an optical network. This thesis is devoted to the proposal of several new and accurate techniques to monitor different optical impairments so as to enhance proper network management. / When the optical signal is carried on fiber links with optical amplifiers, the accumulated amplified spontaneous emission (ASE) noise will result in erroneous detection of the received signals. The first part of the thesis presents a novel, simple, and robust in-band optical signal to noise ratio (OSNR) monitoring technique using phase modulator embedded fiber loop mirror (PM-FLM). This technique measures the in-band OSNR accurately by observing the output power of a fiber loop mirror filter, where the transmittance is adjusted by an embedded phase modulator driven by a low-frequency periodic signal. The robustness against polarization mode dispersion, chromatic dispersion, bit-rate, and partially polarized noise is experimentally demonstrated. / Ku, Yuen Ching. / "August 2007." / Adviser: Chan Chun-Kit. / Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 1208. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (p. 109-120). / 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. / Abstract in English and Chinese. / School code: 1307.

1. Gain modulation induced by the injected optical signals in Semiconductor Optical Amplifier (SOA) is the basis of the whole work in this thesis. For a good understanding of the gain dynamics in SOA, we studied the propagation of lightwave and the carrier density dynamics in SOAs. Detailed theory and simulation results about the gain modulation characteristics induced by the injected signals into the SOA are presented. The simulation results have a good guidance for the experiments in this thesis. / 2. The theory of the actively mode-locked ring laser is studied. Following the theoretical discussion about the actively mode-locked ring laser, the experimental study about a novel actively mode-locked ring laser based on cross-gain-modulation in a SOA, which is employed as both the gain medium and mode-locking element, is proposed and demonstrated. Stable uniform pulse trains with pulse-widths about 24ps at 5GHz repetition frequency are obtained. The wavelength of the mode-locked optical pulses can be continuously tuned from 1533nm to 1565nm. In the whole tuning range, the pulse-width and bandwidth of the output pulses are respectively within 22-26ps and 0.7-0.8nm. / 3. Generation and wavelength switching of picosecond pulses by optically modulating a SOA in a ring laser with eight cascaded fiber Bragg gratings playing the role of the wavelength selecting element is proposed and demonstrated. Stable amplitude equalized pulse trains with a pulsewidth about 43ps at 2.5GHz have been obtained by injecting optical control signals into the laser. When we change the modulation frequency of the injected optical signals from 2.5 GHz to 10 GHz, wavelength switchable optical pulses at 10 GHz have also been obtained through optimizing the experimental parameters such as the SOA driving current and the power of the injection optical signals. Wavelength switching among eight wavelengths is achieved by merely tuning an intra-cavity optical delay line. The theoretical analysis of multi-wavelength operation using the proposed ring cavity has also been presented. / 4. In the actively mode-locked ring laser based on 1.55mum SOA, there exist changes of both gain and refractive index since the wavelengths of the control signal and the data signal are in the same gain spectral region. The gain change is sometimes unwanted because it may result in the amplitude fluctuations of the mode locked pulses and pattern effects. We proposed an all-optical FM actively mode-locked ring laser scheme based on a 1.3mum SOA as a gain-transparent phase modulation only element. The principle of the phase modulation in 1.3mum SOA has been discussed. / 5. Optical clock recovery, which extracts a continuous train of pulses or clock from the modulated data, is an essential technology to realize all optical signal processing such as all optical regeneration repeater and all optical de multiplexing. We experimentally studied all optical clock recovery at 10GHz with switchable wavelengths using the proposed mode-locked ring laser. Very stable clock signals corresponding to the bit rate of the injection data have been obtained by injecting 10Gbit/s 231-1 PRBS data signals into the laser cavity. The side-mode-suppression ratio of the recovery clock signals is better than 28dB. The clock recovery scheme can still function well when the wavelength, polarization state and the density of zeros of the injected data signals are changed. / 6. Finally, we discussed the noises in all optical networks and all optical methods of noise reduction. All optical noise reduction methods are reviewed. We also discussed the feasibility of all optical noise reduction method using the proposed ring laser scheme. / With the advances in Dense Wavelength Division Multiplexing (DWDM) and Optical Time Division Multiplexing (OTDM) technologies and their ever-widening applications, optical transport networks will eventually evolve into all optical networks based on DWDM and OTDM or their combination. However, the adoption of optical technologies has a significant impact on network transmission performance because there will be many optical amplifiers, wavelength division multiplexing devices and optical cross connects which may bring optical noises and time jitters to the all optical networks. Hence many key technologies including the generation of ultrashort optical pulses and all optical signal regeneration are needed in order to realize all optical transport networks. This dissertation mainly describes the generation of optical pulses and all optical clock recovery for all optical signal regeneration. Several theoretical and experimental research results have been obtained as follows. / He Jian. / "April 2006." / Adviser: K. T. Chan. / Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6610. / 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.

In the analysis of optically controlled microstrip interdigitated gaps, an equivalent circuit model for simple interdigitated gap is obtained. As far as we know, this is the first report of optically controlled microstrip interdigitated gap equivalent circuit model. The amplitude and phase changes of interdigitated gaps under different illumination powers are calculated with this equivalent circuit model, which basically agree with the experimental results. Meanwhile, the effect on the transmission characteristics from the gap dimensions is also discussed. Finally a novel gap structure is described for optically controlled phase shifter application, whose transmission characteristics have nearly zero amplitude change and no less than 27 degrees phase change under different illumination powers when the transmission signal frequency is about 1.8 to 2.5GHz. Some detailed experimental results of this gap are presented in Chapter 5. / In this dissertation, a systematic work has been done to analyze the transmission characteristics and applications of optically controlled microstrip single gap and interdigitated gap devices on high resistivity silicon (HRS) wafer. Detailed simulations, experiments and the relative equivalent circuit models for these gap structures are presented. / Microwave photonics is a multi-disciplinary area that studies the interactions between microwave signals and optical signals. As one of the key elements, direct optical control of microwave semiconductor devices has been an area of growing interest since 1980's. They can be widely used in picosecond photoconductive switch, phase shifter, attenuator, high-speed sampling, gain control of amplifier and so on. / Some future work is also suggested based on the study in this dissertation. / Specifically, optically controlled microstrip discontinuities devices fabricated on semiconductor substrates have wide-ranging applications due to their simple fabrication, easy integration with other passive and active microwave devices. / When illuminated on the surface of the microstrip single gaps, the S 12 amplitude of this gap increases linearly as the optical illumination increasing, which is a good potential application for digital controllable attenuator. The change of the S12 amplitude is mainly due to the imaginary permittivity change of the HRS substrates. The equivalent circuit model is established to explain the amplitude and phase changed. The equivalent resistors have been calculated according to the excess carrier concentration profile after illumination, which match well with the experimental results. / Li Huiping. / "March 2005." / Adviser: K. T. Chan. / Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6619. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2005. / 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.

Jorden Yeong-Tswen, Tse. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 76-76). / Abstracts in English and Chinese. / ACKNOWLEDGEMENTS --- p.2 / ABSTRACT --- p.3 / 摘要 --- p.4 / CONTENTS --- p.5 / Chapter CHAPTER 1: --- INTRODUCTION --- p.8 / Chapter 1.1. --- First Mile Evolution --- p.8 / Chapter 1.2. --- Access： Passive Optical Network (PON) --- p.10 / Chapter 1.2.1. --- ATM-PON (APON) --- p.13 / Chapter 1.2.2. --- Ethernet PON (EPON) --- p.14 / Chapter 1.3. --- Problem Definition and Possible Solutions --- p.16 / Chapter 1.3.1. --- Wavelength Division Multiplexing (WDM) --- p.17 / Chapter 1.3.2. --- Time Division Multiplexing (TDM) --- p.18 / Chapter 1.3.3. --- Sub-carrier Multiplexing (SCM) & Frequency Division Multiplexing (FDM) --- p.20 / Chapter 1.3.4. --- Code Division Multi Access (CDMA) --- p.20 / Chapter 1.4. --- Thesis Organization --- p.20 / Chapter CHAPTER 2: --- BACKGROUND --- p.22 / Chapter 2.1. --- EPON Solution：- MPCP --- p.22 / Chapter 2.2. --- CSMA/CD on PON --- p.26 / Chapter 2.3. --- Motivation --- p.28 / Chapter CHAPTER 3: --- CSMA/CA PROTOCOL USING PILOT TONE ON PON --- p.29 / Chapter 3.1. --- Basic Protocol Description --- p.29 / Chapter 3.1.1. --- With No Contention --- p.31 / Chapter 3.1.2. --- With Contention --- p.32 / Chapter 3.1.3. --- With Contention and Winner --- p.33 / Chapter 3.2. --- Simulation --- p.35 / Chapter 3.2.1. --- Effect of Loading on Network Utilization --- p.37 / Chapter 3.2.2. --- Effect of Network Size on Utilization --- p.39 / Chapter 3.2.3. --- Delay Performance --- p.41 / Chapter 3.2.4. --- Effect of Distance from Remote Node --- p.44 / Chapter 3.2.5. --- Effect of Maximum Packet Duration on Utilization and Delay --- p.45 / Chapter 3.3. --- Conclusions --- p.47 / Chapter CHAPTER 4: --- PROTOCOL ENHANCEMENT ON VARIOUS ASPECTS --- p.48 / Chapter 4.1. --- Utilization Enhancement --- p.48 / Chapter 4.1.1. --- Improvement on Network Utilization --- p.50 / Chapter 4.1.2. --- Network Delay Performance --- p.52 / Chapter 4.1.3. --- Conclusions --- p.53 / Chapter 4.2. --- Capture Effect --- p.53 / Chapter 4.2.1. --- Solution by Varying Ts --- p.54 / Chapter 4.2.2. --- Simulations --- p.55 / Chapter 4.2.3. --- Conclusions --- p.58 / Chapter 4.3. --- Introducing Cos to existing network --- p.59 / Chapter 4.3.1. --- Principle --- p.59 / Chapter 4.3.2. --- Simulation Model --- p.60 / Chapter 4.3.3. --- Utilization Performance --- p.61 / Chapter 4.3.4. --- Delay Performance --- p.64 / Chapter 4.3.5. --- Conclusions --- p.68 / Chapter CHAPTER 5: --- CONCLUSIONS --- p.69 / Chapter 5.1. --- Thesis Summary --- p.69 / Chapter 5.2. --- Future Work --- p.71 / REFERENCES --- p.73

by Chan Tsan Jim. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2003. / Includes bibliographical references (leaves 68-71). / Abstracts in English and Chinese. / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Introduction --- p.1 / Chapter 1.2 --- Background --- p.2 / Chapter 1.2.1 --- Introduction --- p.2 / Chapter 1.2.2 --- Wavelength Division Multiplexing --- p.3 / Chapter 1.2.3 --- Arrayed Waveguide Grating --- p.5 / Chapter 1.2.4 --- Passive Optical Networks --- p.7 / Chapter 1.3 --- Outline of the thesis --- p.10 / Chapter Chapter 2 --- Review of Protection and Restoration Schemes --- p.12 / Chapter 2.1 --- Introduction --- p.12 / Chapter 2.2 --- Protection Schemes --- p.14 / Chapter 2.2.1 --- Path Protection --- p.14 / Chapter 2.2.2 --- Link Protection --- p.16 / Chapter 2.3 --- Restoration Schemes --- p.17 / Chapter 2.3.1 --- Path Restoration --- p.17 / Chapter 2.3.2 --- Link Restoration --- p.18 / Chapter 2.4 --- Protection and Restoration Schemes in PON --- p.18 / Chapter 2.4.1 --- Protection Schemes in G.983.1 --- p.18 / Chapter 2.4.2 --- Other Proposed Schemes --- p.21 / Chapter Chapter 3 --- Design of WDM PON Network Architecture --- p.26 / Chapter 3.1 --- Introduction --- p.26 / Chapter 3.2 --- The Group Protection Architecture (GPA) --- p.27 / Chapter 3.2.1 --- Network Design --- p.27 / Chapter 3.2.2 --- Protection Mechanism --- p.28 / Chapter 3.2.3 --- Wavelength Assignments --- p.30 / Chapter 3.2.4 --- Power Budget Calculation --- p.32 / Chapter 3.2.5 --- Crosstalk Analysis --- p.33 / Chapter 3.2.6 --- Discussion --- p.35 / Chapter 3.3 --- The Enhanced Group Protection Architecture (EGPA) --- p.36 / Chapter 3.3.1 --- Introduction --- p.36 / Chapter 3.3.2 --- Network Design --- p.37 / Chapter 3.3.3 --- Protection Mechanism --- p.38 / Chapter 3.3.4 --- Wavelength Assignments --- p.39 / Chapter 3.3.5 --- Power Budget Calculation --- p.40 / Chapter 3.3.6 --- Crosstalk Analysis --- p.41 / Chapter 3.3.7 --- Discussion --- p.42 / Chapter 3.4 --- The Hybrid Ring Architecture (HR) --- p.42 / Chapter 3.4.1 --- Introduction --- p.42 / Chapter 3.4.2 --- Network Design --- p.43 / Chapter 3.4.3 --- Protection Mechanism --- p.44 / Chapter 3.4.4 --- Wavelength Assignments --- p.45 / Chapter 3.4.5 --- Power Budget Calculation --- p.46 / Chapter 3.4.6 --- Crosstalk Analysis --- p.47 / Chapter 3.4.7 --- Discussion --- p.47 / Chapter 3.5 --- Comparison of the three schemes --- p.48 / Chapter 3.6 --- Summary of the three schemes --- p.50 / Chapter Chapter 4 --- Experimental Evaluation --- p.51 / Chapter 4.1 --- Introduction --- p.51 / Chapter 4.2 --- Experimental Setup --- p.51 / Chapter 4.2.1 --- The GPA Scheme --- p.51 / Chapter 4.2.2 --- The EGPA Scheme --- p.53 / Chapter 4.2.3 --- The HR Scheme --- p.54 / Chapter 4.3 --- Experimental Result --- p.55 / Chapter 4.3.1 --- Optical Spectrum --- p.55 / Chapter 4.3.2 --- Transmission Performance --- p.58 / Chapter 4.3.3 --- Switching/Restoration Time --- p.61 / Chapter 4.3.4 --- Crosstalk Penalty --- p.63 / Chapter 4.4 --- Conclusion --- p.64 / Chapter Chapter 5 --- Conclusion and Future Works --- p.65 / Chapter 5.1 --- Introduction --- p.65 / Chapter 5.2 --- Conclusion --- p.65 / Chapter 5.3 --- Future Works --- p.66 / References --- p.67

Zhang, Yin. / Thesis submitted in: December 2008. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (leaves 56-60). / Abstracts in English and Chinese. / Chapter Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Telecommunications network hierarchy --- p.2 / Chapter 1.2 --- PON architectures for access networks --- p.4 / Chapter 1.2.1 --- TDM-PON --- p.5 / Chapter 1.2.2 --- WDM-PON --- p.7 / Chapter 1.3 --- Data delivery mode in WDM-PON --- p.8 / Chapter 1.3.1 --- Point-to-point --- p.8 / Chapter 1.3.2 --- Broadcast --- p.9 / Chapter 1.3.3 --- Multicast --- p.10 / Chapter 1.4 --- Motivation of this thesis --- p.10 / Chapter 1.5 --- Outline of this thesis --- p.13 / Chapter Chapter 2 --- Previous Multicast Architectures in WDM-PON --- p.14 / Chapter 2.1 --- Introduction --- p.15 / Chapter 2.2 --- Previous WDM-PON architectures with multicast capability --- p.15 / Chapter 2.2.1 --- Subcarrier multiplexing --- p.16 / Chapter 2.2.2 --- All-optical based multicast enabled architecture --- p.18 / Chapter 2.3 --- Summary --- p.21 / Chapter Chapter 3 --- A Multicast enabled WDM-PON Architecture Using ASK-DPSK Orthogonal Modulation --- p.23 / Chapter 3.1 --- Introduction --- p.24 / Chapter 3.2 --- System architecture --- p.25 / Chapter 3.3 --- Experimental Demonstration --- p.27 / Chapter 3.4 --- Discussion --- p.31 / Chapter 3.5 --- Summary --- p.36 / Chapter Chapter 4 --- A WG filtering and its suppression in quaternary ASK-DPSK based multicast enabled WDM-PON --- p.37 / Chapter 4.1 --- Introduction --- p.38 / Chapter 4.2 --- Principle of narrowband filtering --- p.38 / Chapter 4.3 --- Simulation model --- p.40 / Chapter 4.4 --- Simulation results and discussion --- p.42 / Chapter 4.4.1 --- Different extinction ratios --- p.43 / Chapter 4.4.2 --- Different AWG filter shape and bandwidth --- p.47 / Chapter 4.5 --- Summary --- p.50 / Chapter Chapter 5 --- Summary and Future Works --- p.51 / Chapter 5.1 --- Summary of the thesis --- p.52 / Chapter 5.2 --- Future works --- p.53 / List of Publications --- p.55 / BIBLIOGRAPHY --- p.56

Long distance repeaterless optical fiber communications systems are currently used to transmit most internet and telephone information worldwide. The growth of photonic telecommunications technology has produced systems with very high bit-rate per fiber, but this still falls short of its potential capacity. Currently systems that are able to transmit even higher bit-rates are being developed utilizing dense wavelength-division-multiplexing (WDM) to maximally utilize the bandwidth potential of optical fibers. One of the most important factors that limits the bit-rate achievable in a such a WDM optical communications system is the cross-talk between channels caused by pulse collisions. In this thesis a consistent mathematical theory is used to analyze the frequency and timing shifts caused collisions between two WDM channels. This theory is applied to the systems currently most promising for next-generation photonic telecommunications; the dispersion managed (DM) soliton and 'quasi-linear' systems. Self-contained formulae are obtained which accurately predict the timing shifts suffered in these systems with a wide range of parameters. These formulae require an order of magnitude less computational time that direct numerical simulations. Several mathematical techniques are introduced to obtain computationally efficient formulae for complete and incomplete collisions in both systems. For complete collisions we use the Poisson sum transform to change the calculation to a sum in the Fourier domain. For incomplete collisions we use asymptotic integration to obtain approximate formulae. For quasi-linear systems we simplify the Laplace method even further to obtain elementary formulae. We show that using a combination of these methods the timing shift for incomplete and complete collisions in a wide range of system configurations can be obtained in comparatively small computational times. We find that for systems with small DM map strength the timing shift from widely separated channels is significant. For quasi-linear systems with large DM map strength this is negligable and the timing shift decreases with the square of the channel frequency separation. We also find the timing shift from closely spaced channels is higher for quasi-linear systems than for DM soliton systems operating at the same average dispersion.

Thesis (Ph. D.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.

Thesis (Ph. D.)--University of Hong Kong, 2007. / Title from title frame. Also available in printed format.