分波多工技術已知可增加光通訊系統的總容量；然而，系統效能仍會明顯受到色散及非線性效應等所限制。本論文主要在探討非線性效應對於短程光通訊系統以及長程光通訊系統的影響。
短程光通訊系統主要應用於接取網路。被動光接取網路通常用以連接獨立用戶至地區中央局，且由於被動接取光網路之中央局外部並無設置任何主動元件，可大幅降低系統成本以及維護頻率。本論文提出一種長程被動光網路，其可進一步降低系統複雜度以及系統成本。我們發現在我們提出的長程被動光網路中，四波混合以及瑞立逆散射導致的串擾為影響系統效能的兩個主要原因。
長程光通訊系統主要應用於越洋網路。雖然差分相位移鍵調變技術已經被確認適合用於長程分波多工系統，我們發現在靠近系統零色散波長附近具有效能下降的情形。在本論文中，我們設計了各種實驗以確認觀測到的效能下降是何種非線性效應所造成，並總結自相位調變是造成效能下降的主要原因，而並非交互相位調變或非線性相位雜訊。

The wavelength-division multiplexing (WDM) is a well know technique capable of increasing the total capacity of a lightwave communication system; however, the system performance can be significantly limited by the dispersive and nonlinear effects, among others. This dissertation is mainly focused on the nonlinear effects upon the short-haul and long-haul lightwave systems.The short-haul lightwave system is mainly adopted in the access network. A passive optical access network is generally used to connect individual homes to a central office of a local area, and since there is no active component installed outside the central office of the passive optical access network, the system complexity and maintenance frequency can be significantly reduced. This dissertation provides a long-reach passive optical network (LR-PON) which can further reduce the system complexity and system cost. We found that four-wave mixing (FWM) and Rayleigh backscattering induced crosstalk were two main reasons to degrade the transmission performance in our proposed LR-PON.
The long-haul lightwave system is mainly adopted in the transoceanic application. Although differential phase-shit keying (DPSK) modulation format has been confirmed to be suitable for long-haul WDM system, we found that a performance dip can be observed near the system zero dispersion avelength. In this dissertation, we designed various experiments to confirm the nonlinear effect to cause the performance dip being observed, and concluded that self-phase modulation (SPM) was the dominant reason to cause the performance dip rather than cross-phase modulation (XPM) or nonlinear phase noise.

中文論文審定書 i
英文論文審定書 ii
中文摘要 iii
Abstract iv
Chapter 1 Introduction 1
1.1 Historical brief of lightwave systems 1
1.2 Motivation 3
1.3 Overview 5
Reference 6
Chapter 2 TDM over Long-reach WDM Hybrid PON 9
2.1 Optical network 9
2.2 Passive optical access network 10
2.2.1 Time-division multiplexing PON 11
2.2.2 Wavelength-division multiplexing PON 12
2.3 Long-reach PON 14
2.4 Proposed long-reach PON 15
2.4.1 Experimental setup 15
2.4.2 Experimental results and discussions 19
2.5 Summary 47
Reference 48
Chapter 3 Long-haul RZ-DPSK WDM Transmission System with a Block Type Dispersion Map 50
3.1 Digital data format 50
3.2 Modulation format 52
3.2.1 Amplitude-shift keying format 53
3.2.2 Phase-shift keying format 53
3.2.3 Frequency-shift keying format 53
3.2.4 Differential phase-shift keying format 53
3.3 Dispersion map 56
3.4 Nonlinear effects 58
3.4.1 Self phase modulation 59
3.4.2 Cross phase modulation 60
3.4.3 Nonlinear phase noise 61
3.5 Experimental setup 61
3.5.1 Transmitter end 62
3.5.2 Transmission line 63
3.5.3 Recirculating loop 64
3.5.4 Receiving end 66
3.6 Experimental results and discussions 67
3.6.1 Impact of the cross-phase modulation effect 67
3.6.2 Impact of the self-phase modulation effect 78
3.6.3 Impact of the nonlinear phase noise 86
3.7 Summary 95
Reference 97
Chapter 4 Conclusion 100
Publications 102
Acronyms 103

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