近年來,隨著互聯(lián)網(wǎng)產(chǎn)業(yè)的快速發(fā)展,移動物聯(lián)網(wǎng)、大數(shù)據(jù)和云計算等數(shù)據(jù)業(yè)務的爆炸式增長使得傳輸容量面臨不斷擴容的壓力。日益增長的光網(wǎng)絡(luò)互聯(lián)應用需求使得提高光網(wǎng)絡(luò)的容量和頻譜效率(SE)成為一項艱巨的任務。用先進的調(diào)制格式和相干技術(shù)取代現(xiàn)有的諸如強度和開關(guān)鍵控(OOK)調(diào)制格式等通信系統(tǒng)技術(shù),已成為一種發(fā)展趨勢。本文提出了一種利用高階QAM的高光譜效率光通信系統(tǒng)及相干檢測方案。該方案為高階QAM和脈沖整形技術(shù)的相干光通信系統(tǒng),采用了偏振復用(Pol-Mux)和光檢測器靈敏度提高的相干零差接收機。此外,一種新的均衡補償方法的數(shù)字信號處理單元被用于光譜高效光通信系統(tǒng)中。本文的工作總結(jié)如下:1)首先,研究了一種梯形脈沖整形的高階QAM信號生成方案。討論了具有梯形脈沖整形的128-QAM和256-QAM等高階QAM及其仿真結(jié)果和優(yōu)點。信號經(jīng)過了梯形脈沖整形和偏振多路復用后,在長度超過80km的光纖中傳輸仿真。對于采用了梯形光學濾波的脈沖整形128 QAM的情況,信號在超過80 km光纖單通道上傳輸帶寬280 Gbit/s,結(jié)果顯示該方案的功耗最小、誤碼率最低。2)其次,在接收端設(shè)計了采用InGaAs...

【文章頁數(shù)】：74 頁

【學位級別】：碩士

【文章目錄】：
abstract
摘要
DEDICATION
List of Abbreviations
Chapter 1: Introduction
    1.1 Background of Research & Significance
    1.2 Research Status
    1.3 Challenges and Goals
    1.4 Research Work
    1.5 Report Layout
Chapter 2: Theoretical Fundamentals
    2.1 Brief History of Fiber-Optic Communications
    2.2 Motivations for Advanced Modulation Formats
        2.2.1 Differential Phase Shift Keying (DPSK)
        2.2.2 Differential Quadrature Phase Shift Keying(DQPSK)
        2.2.3 Polarization Multiplexing (Pol-MUX)
        2.2.4 WDM and OTDM
    2.3 Study of Higher Order QAM
    2.4 Study of Polarization Multiplexing
    2.5 Principles of Coherent Optical Communication
        2.5.1 Homodyne Detection (HMD-D)
        2.5.2 Heterodyne detection (HMD-D)
    2.6 DSP Based Coherent Transceivers
    2.7 Summary
Chapter 3: The Scheme for Higher Order QAM Signal Generation and Pulse Shaping
    3.1 The Scheme of Higher Order QAM Signal Generation and Pulse Shaping
        3.1.1 Simulation Setup of The Model
        3.1.2 Trapezoidal Pulse Shaping of the QAM Signal
        3.1.3 Modulation and Multiplexing of QAM Signal
    3.2 Simulation Results of The Scheme
        3.2.1 Simulation Results and Analysis of 128-QAM with Pulse Shaping
        3.2.2 Simulation Results and Analysis of 256-QAM with Pulse Shaping
    3.3 Summary
Chapter 4: Coherent Detection and Processing of Signal in DSP
    4.1 The Scheme for Coherent Detection with InGaAs Waveguide
    4.2 Theoretical Analysis of The Coherent Detection Scheme
    4.3 Performance Analysis of QAM Based Homodyne Detection
    4.4 Simulation Results and Analysis
    4.5 Summary
Chapter 5: Conclusion and Future Directions
    5.1 Conclusion
    5.2 Future Directions
Chapter 6: References
ACKNOWLEDGEMENT



本文編號：3753021