När olika datatyper överförs mellan två platser har, historiskt sett, detta skett på skildinfrastruktur; analoga signaler för sig, och digitala data för sig. Inom flygindustrin hanteras båda dessa datatyper än idag, då övergång från analoga röstsamtal till digitala röstsamtal tar tid. För att förenkla infrastrukturen är det önskvärt att skicka all data på samma medium. Time Division Multiplexing (TDM) möjliggör detta och har studerats med fokus på robusthet och prestanda. Studien har fokuserat på hur TDM-enheter ska konfigureras med avseende på Ethernet-frame-storlek för att till fullo utnyttja länkkapaciteten. Teoretiska resonemang har validerats av experimentella data som utförts på TDM-enheter sammankopplade med en fiberlänk. Antalet förlorade frames för systemet har mätts med varierande datatillförselshastighet. Detta upprepades för ett flertal Ethernet-frame-storlekar. Mindre frame-storlekar gav en högre möjlig överföringshastighet innan data förloras, och uppvisade koherens mellan teori och experiment. Stora frame-storlekar fyllde i snitt TDM-tidsluckorna sämre, och gjorde att databuffert på enheten fylldes snabbare än för mindre framstorlekar. Detta ledde till dataförluster i systemet. Andra faktorer, som overhead och payload, gjorde att framestorleken borde väljas efter applikation. Mindre datamängder som skickas ofta kan med fördel använda mindre frame-storlekar, medan stora datamängder som behöveröverföras snabbt effektivare överförs med större frame-storlekar. / When transferring different data types between two sites, they have historically been transferred on separate infrastructures; analog signals separately, and digital data separately. Within the aviation industry, both these data types are still handled today, as transition from analog voice data to digital voice data takes time. To simplify the infrastructure, it is desirable to send all data on the same medium. Time Division Multiplexing (TDM) makes this possible and has been studied with focus on robustness and performance. The study has focused on how TDM devices should be configured with respect to Ethernet frame size to fully utilize link capacity. Theoretical reasoning has been validated by experimental data performed on TDM devices coupled with a fiber link. The number of lost frames for the system has been measured while varying data rates. This was repeated for several Ethernet frame sizes. Smaller frame sizes showed a higher possible transfer rate before data loss was recorded. This shows coherence between theory and experiments. Larger frame sizes were less good at filling the TDM time slots, causing data buffer on the device to overflow faster than for smaller frame sizes. This created data loss in the system. Other factors, such as overhead and payload, implies that the frame size should be chosen by application. Smaller data volumes that are sent frequently have an advantage when using smaller frame sizes, while when handling largeramounts of data that need to be transmitted quickly, it is more efficient to use larger frame sizes

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

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by Eddie Ting Pong Kong. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1999. / Includes bibliographical references (leaves 61-68). / Abstracts in English and Chinese. / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Optical Network Architecture --- p.1 / Chapter 1.2 --- High-Speed All-Optical Tunable-Channel Multi-Access Networks --- p.3 / Chapter 1.3 --- Fault Surveillance of Optical Cross-Connects in Wavelength Routing Network --- p.3 / Chapter 1.4 --- Outline of the Thesis --- p.5 / Chapter 2 --- Optical Multi-Access Networks --- p.6 / Chapter 2.1 --- All-Optical Networks --- p.6 / Chapter 2.2 --- Optical Multi-Access Schemes --- p.8 / Chapter 2.2.1 --- Wavelength-Division Multi-Access (WDMA) --- p.9 / Chapter 2.2.2 --- Time-Division Multi-Access (TDMA) --- p.12 / Chapter 2.2.3 --- Subcarrier Multi-Access (SCMA) --- p.14 / Chapter 2.3 --- Design Considerations --- p.14 / Chapter 3 --- All-Optical Tunable-Channel Multi-Access Networks --- p.18 / Chapter 3.1 --- Tunable-Channel Multi-Access Networks --- p.19 / Chapter 3.2 --- Protocols for TCMA Networks --- p.20 / Chapter 3.3 --- Photonic Implementation of a Wavelength Division TCMA Network with Time- Slot Access --- p.23 / Chapter 3.3.1 --- Proposed Network Architecture --- p.25 / Chapter 3.3.2 --- Experimental Results --- p.30 / Chapter 3.3.3 --- Discussion --- p.34 / Chapter 3.3.4 --- Summary --- p.35 / Chapter 4 --- Fault Surveillance for Optical Cross-Connects in Wavelength Routing Networks --- p.36 / Chapter 4.1 --- Wavelength Routing Networks --- p.37 / Chapter 4.2 --- Options in Fault Surveillance --- p.39 / Chapter 4.3 --- Optical Path Surveillance of Optical Cross-Connects in Wavelength Routing Networks --- p.41 / Chapter 4.3.1 --- Scanning Amplified Spontaneous Emission Identification Surveillance Scheme --- p.43 / Chapter 4.3.2 --- Pilot-Tone Based Surveillance and Removal Scheme --- p.49 / Chapter 4.4 --- Summary --- p.55 / Chapter 5 --- Conclusion --- p.57 / Chapter 5.1 --- Summary of the Thesis --- p.57 / Chapter 5.2 --- Future Work --- p.60 / Bibliography --- p.61 / Publication List --- p.59

Hu, Hai. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2013. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.

Zhang Bo. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references (leaves 55-59). / Abstracts in English and Chinese. / Chapter Chapter 1 --- Introduction to Passive Optical Networks --- p.1 / Chapter 1.1 --- Passive Optical Network (PON) --- p.2 / Chapter 1.1.1 --- PON architecture --- p.3 / Chapter 1.1.2 --- PON benefits --- p.4 / Chapter 1.2 --- The History of PON --- p.4 / Chapter 1.3 --- WDM-PON --- p.5 / Chapter 1.4 --- Outline of This Thesis --- p.8 / Chapter Chapter 2 --- Previous Schemes for Colorless ONU Operation in WDM-PON --- p.9 / Chapter 2.1 --- Introduction --- p.10 / Chapter 2.2 --- Previous WDM-PON Architectures for Colorless ONU Operation --- p.10 / Chapter 2.2.1 --- Spectrum slicing BLS employed at the ONU --- p.11 / Chapter 2.2.2 --- Centralized broadband light source (BLS) for upstream optical carrier supply --- p.12 / Chapter 2.2.3 --- Reuse of the downstream carrier at the ONU --- p.17 / Chapter 2.3 --- Summary --- p.21 / Chapter Chapter 3 --- WDM-PON with a Centralized Supercontinuum Broadband Light Source for Colorless ONUs --- p.23 / Chapter 3.1 --- Introduction --- p.24 / Chapter 3.1.1 --- Introduction to Supercontinuum Generation --- p.24 / Chapter 3.1.2 --- Introduction to Photonic Crystal Fibers --- p.25 / Chapter 3.1.3 --- Supercontinuum Generation in a Photonic Crystal Fiber --- p.27 / Chapter 3.2 --- WDM-PON with Centralized Supercontinuum Broadband Light Source --- p.27 / Chapter 3.2.1 --- Motivation --- p.27 / Chapter 3.2.2 --- Proposed access network --- p.28 / Chapter 3.2.3 --- Experimental demonstration and results --- p.30 / Chapter 3.2.4 --- Discussions --- p.32 / Chapter 3.2.5 --- Conclusion --- p.34 / Chapter 3.3 --- Broadcast Signal Delivery over a WDM-PON based on Supercontinuum Generation --- p.34 / Chapter 3.3.1 --- Motivation --- p.34 / Chapter 3.3.2 --- Proposed network architecture --- p.35 / Chapter 3.3.3 --- Experiment results and discussions --- p.36 / Chapter 3.3.4 --- Conclusion --- p.38 / Chapter 3.4 --- Summary --- p.38 / Chapter Chapter 4 --- A Survivable WDM-PON with Colorless Optical Network Units --- p.39 / Chapter 4.1 --- Introduction --- p.40 / Chapter 4.2 --- Previous Protection Schemes --- p.40 / Chapter 4.3 --- A Survivable WDM-PON with Centralized BLS --- p.44 / Chapter 4.3.1 --- Network topology and wavelength assignment --- p.45 / Chapter 4.3.2 --- Protection operation principles --- p.46 / Chapter 4.3.3 --- Experimental results --- p.47 / Chapter 4.4 --- Summary --- p.48 / Chapter Chapter 5 --- Summary and Future Work --- p.50 / Chapter 5.1 --- Summary of the Thesis --- p.51 / Chapter 5.2 --- Future Work --- p.52 / LIST OF PUBLICATIONS --- p.54 / REFERENCES --- p.55

Sun Xiaofeng. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references (leaves 61-64). / Abstracts in English and Chinese. / Chapter CHAPTER 1 --- INTRODUCTION --- p.1 / Chapter 1.1 --- Optical network evolution --- p.2 / Chapter 1.1.1 --- Submarine and terrestrial long-haul fibre systems --- p.2 / Chapter 1.1.2 --- Metropolitan networks --- p.3 / Chapter 1.1.3 --- Access networks --- p.4 / Chapter 1.2 --- Motivation of this thesis --- p.6 / Chapter 1.3 --- Outline of this thesis --- p.7 / Chapter CHAPTER 2 --- PREVIOUS SELF-HEALING NETWORK ARCHITECTURES --- p.9 / Chapter 2.1 --- Introduction --- p.10 / Chapter 2.1.1 --- Previous protection architectures for access networks --- p.10 / Chapter 2.1.2 --- Previous protection architectures for metro access networks --- p.13 / Chapter 2.3 --- Previous protection architectures for metro backbone networks --- p.15 / Chapter 2.3.1 --- Unidirectional path-switched rings (UPSR) --- p.15 / Chapter 2.3.2 --- Bidirectional line-switched rings (BLSR) --- p.16 / Chapter 2.3.3 --- Ring interconnection and dual homing --- p.17 / Chapter 2.4 --- Summary --- p.19 / Chapter CHAPTER 3 --- SELF-HEALING NETWORK ARCHITECTURE FOR WDM OPTICAL ACCESS NETWORKS --- p.20 / Chapter 3.1 --- Introduction --- p.21 / Chapter 3.2 --- Star-Ring Protection Architecture (SRPA) --- p.21 / Chapter 3.2.1 --- Motivation --- p.21 / Chapter 3.2.2 --- Network topology of SRPA --- p.22 / Chapter 3.2.3 --- Wavelength assignment of SRPA --- p.22 / Chapter 3.2.4 --- Structure of ONU --- p.23 / Chapter 3.2.5 --- Protection mechanism --- p.25 / Chapter 3.2.6 --- Experimental demonstration --- p.26 / Chapter 3.2.7 --- Power budget --- p.28 / Chapter 3.2.8 --- Summary --- p.28 / Chapter 3.3 --- Duplicated-Tree Protection Architecture (DTPA) --- p.28 / Chapter 3.3.1 --- Motivation --- p.28 / Chapter 3.3.2 --- Network topology and wavelength assignment --- p.29 / Chapter 3.3.3 --- Structure of OLT --- p.30 / Chapter 3.3.4 --- Protection mechanism --- p.31 / Chapter 3.3.5 --- Experimental demonstration --- p.33 / Chapter 1.1.1 --- Summary --- p.34 / Chapter 1.4 --- Summary --- p.35 / Chapter CHAPTER 4 --- SINGLE-FIBER SELF-HEALING WDM RING NETWORK ARCHITECTURE FOR METRO ACCESS NETWORKS --- p.36 / Chapter 4.1 --- Introduction --- p.37 / Chapter 4.2 --- Network architecture and wavelength assignment --- p.37 / Chapter 4.3 --- Structure of access node --- p.39 / Chapter 4.4 --- Structure of hub node --- p.40 / Chapter 4.5 --- Protection mechanism --- p.42 / Chapter 4.6 --- Experimental demonstration --- p.43 / Chapter 4.7 --- Optimization of access node --- p.47 / Chapter 4.8 --- Scalability --- p.48 / Chapter 4.9 --- Summary --- p.49 / Chapter CHAPTER 5 --- SELF-HEALING WDM MESH NETWORK ARCHITECTURE FOR METRO BACKBONE NETWORKS… --- p.50 / Chapter 5.1 --- Introduction --- p.51 / Chapter 5.2 --- Network architecture and node structure --- p.51 / Chapter 5.3 --- Protection mechanism --- p.53 / Chapter 5.4 --- Experimental demonstration --- p.55 / Chapter 5.5 --- Summary --- p.57 / Chapter CHAPTER 6 --- SUMMARYAND FUTURE WORKS --- p.58 / Chapter 6.1 --- Summary of the Thesis --- p.59 / Chapter 6.2 --- Future Works --- p.59 / LIST OF PUBLICATIONS --- p.61 / REFERENCES --- p.62

by Mak Wing-keung. / "August 2000." / Thesis (Ph.D.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references. / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web. / Abstracts in English and Chinese.