雙邊多頻帶直接檢測光學正交分頻多工系統｜國立清華大學博碩士論文庫

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研究生：	張原瑋 Chang, Yuan-Wei
論文名稱：	雙邊多頻帶直接檢測光學正交分頻多工系統 Double-sided Multiband Direct-Detected Optical OFDM System
指導教授：	馮開明 Feng, Kai-Ming
口試委員:	陳智弘 Chen, Jye-Hong 黃元豪 Huang, Yuan-Hao
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 通訊工程研究所 Communications Engineering
論文出版年：	2012
畢業學年度：	100
語文別：	中文
論文頁數：	76
中文關鍵詞：	光學正交分頻多工、直接檢測、多頻帶
外文關鍵詞：	O-OFDM, Direct-detection, Multiband
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Optical OFDM系統近年來已成為熱門的研究領域，OFDM系統由於其正交的特性，使子載波可以互相重疊，因此頻譜使用效益比傳統OOK(on-off keying)調變方式大幅上升。在過去的光纖通訊領域中，通常都以光學的方式來做通道補償，但光學補償的方式成本需求高、系統複雜，隨著九零年代積體電路的發展，近年來數位訊號處理已演變成主要的通道補償方式，其原因為使用不同的演算法解決通道所帶來的影響，最後再利用積體電路整合起來，其成本將遠小於光學的通道補償。然而，使用數位訊號處理必須使用DAC與ADC來產生訊號與接收訊號，因此，DAC/ADC的硬體頻寬能否應付光纖通訊系統的大頻寬、大通訊容量將是關鍵。本篇論文提出double-sided多頻帶直接偵測OFDM系統的接收方式來降低系統對於DAC/ADC的需求。
在本篇論文中，首先將會介紹光學OFDM的基本調變原理與接收方式，接著提到本篇論文數位訊號處理詳細的流程，再來將介紹多頻帶的OFDM系統調變模式，最後，我們將提出double-sided多頻帶OFDM系統實驗架構與詳細實驗流程，在接收端使用OBPF分別解調各個band的方法，解決SSBI的干擾。最後，我們驗證了傳輸速率達75 Gb/s 、頻寬效益達2.1 b/s/Hz的4-band系統與傳輸速率達172 Gb/s 、頻寬效益達2.7 b/s/Hz的6-band系統，並以VPI模擬結果相似，其結果達到錯誤更正碼的極限(BER < 10-3)。而在直接接收系統裡，需要考慮的CSPR參數，我們經由測量不同CSPR時的系統表現，並以VPI模擬實驗系統，確定了系統的最佳CSPR。

目        錄

摘要................................................................................................................................I
致謝...............................................................................................................................II
目錄..............................................................................................................................III
圖列表...........................................................................................................................V
表列表.......................................................................................................................VIII
第一章    緒論................................................................................................................1                                                   
1-1    前言................................................................................................................1
1-2    研究目的與動機............................................................................................3
1-3    論文架構........................................................................................................5
第二章    光學正交分頻多工系統................................................................................6
    2-1    OFDM系統調變與解調原理.......................................................................6
    2-2    光學調變器....................................................................................................8
        2-2-1    Mach-Zehnder Modulator...............................................................8
        2-2-2    IQ Optical Modulator...................................................................10
    2-3    光學OFDM系統.........................................................................................11
        2-3-1    直接檢測......................................................................................11
        2-3-2    同調檢測......................................................................................13
        2-3-3    直接檢測與同調檢測的差異......................................................14


第三章    數位訊號處理在正交分頻多工系統..........................................................16
3-1    用DSP實現OFDM訊號的調變與解調.....................................................16
    3-2    循環字首(Cyclic Prefix)..............................................................................18
    3-3    同步(Synchronization).................................................................................21
    3-4    等化器(Equalizer)........................................................................................22
    3-5    Decision-Directed Phase Noise Compensator..............................................24
    3-6    Error vector magnitude.................................................................................26
第四章    Double-sided多頻帶直接偵測OFDM系統..............................................27
    4-1    多頻帶OFDM系統.....................................................................................27
    4-2    光學多頻帶OFDM系統傳送端.................................................................28
    4-3    光學多頻帶OFDM系統接收端.................................................................30
第五章    Double-sided多頻帶直接偵測光學OFDM系統實驗..............................33
        5-1    傳輸端架構..........................................................................................33
            5-1-1    75Gb/s (4-band)系統............................................................34
            5-1-2    Digital to Analog Converter比較........................................38
            5-1-3    172 Gb/s (6-band)系統.........................................................40
        5-2    接收端架構..........................................................................................44
        5-3    75Gb/s系統實驗流程與結果.............................................................45
            5-3-1    實驗流程..............................................................................45
            5-3-2    實驗結果..............................................................................49
        5-4    172 Gb/s系統實驗流程與結果...........................................................56
            5-4-1    實驗流程..............................................................................56
            5-4-2    實驗結果..............................................................................60
第六章    結論..............................................................................................................72
參考文獻......................................................................................................................74

                                

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