在光纖通訊網路系統中，對於更為快速的速度需求急遽地增長，使得更為有效率的利用頻寬在光纖通訊系統中，像是在有效的頻寬內提升更高頻寬效率是必須實行的。
在光分波多工(WDM) 系統中，為了提升頻寬效率，其中一個方法是減少每一個頻道之間的距離。以前利用奈奎斯特濾波器來限制頻寬以達到奈奎斯特頻寬。但是設計一個非常精準且頻寬極窄的奈奎斯特濾波器是一個困難的技術也是一個挑戰。
本論文擬將利用時域 SINC波去調變隨機訊號(PRBS)，把訊息限制在奈奎斯特頻寬中並且在頻域轉換成方波。這表示我們可以不使用任何奈奎斯特濾波器來限制頻寬就可以在頻域上達成奈奎斯特頻寬。

The steadily growing huge demand for capacity in optical fiber communication networks makes a more efficient utilization of the available bandwidth in optical fibers such that increased spectral efficiency is necessary.
In order to increase the spectral efficiency in wavelength division multiplexed (WDM) systems, one approach is to reduce the channel spacing between the individual WDM channels.
Nyquist WDM systems required to realize the Nyquist bandwidth by using the filter to limit the bandwidth. However, implementing such kind of high precision and narrow Nyquist filters are the challenge and complex technologies.
This master thesis intends to utilize the SINC waveform in time domain which is modulated with pseudo random binary sequence (PRBS) to pack the information in the Nyquist bandwidth, and realizes the rectangular spectrum in the frequency domain. It means that it can realize the rectangular spectrum without using any filter to shape the spectrum in the frequency domain.

英文論文審定書 i
中文論文審定書 ii
致謝 iii
中文摘要 iv
Abstract v
Contents vi
圖次 viii
Chapter 1 Introduction 1
1.1 Nyquist WDM System 1
1.2 Motivation 2
1.3 Structure of this Thesis 3
References 5
Chapter 2 Technologies of the Nyquist WDM System 6
2.1 Introduction 6
2.2 Nyquist WDM Definition 7
2.3 SINC-based Waveform in Time domain 9
2.3.1 Fundamental Concept 9
2.3.2 Time domain signal based on SINC 11
2.4 Calculation Results 16
2.5 Intensity Modulation 20
Attachment of Chapter 2 22
References 25
Chapter 3 Experimental Investigation of Nyquist WDM System Based on SINC Waveform 27
3.1 Introduction 27
3.2 Experimental Setup 28
3.2.1 NRZ/RZ SINC Signal for Experiment 28
3.2.2 Experimental Setup 31
3.2.3 Performance Measurement Setup 34
3.3 Results and Discussions 36
Attachments of Chapter 3 42
References 49
Chapter 4 Summary 50
List of Abbreviations 51

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