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研究生:藍健凱
研究生(外文):Chien-Kai Lan
論文名稱:直接調變雷射為基礎之強度調變直接偵測系統建模與分析及其應用在正交分頻多工傳輸優化中
論文名稱(外文):Modeling and Analysis of DML-based IM/DD Systems and Its Application in the Optimization of OFDM Transmission
指導教授:魏嘉建
指導教授(外文):Chia-Chien Wei
學位類別:碩士
校院名稱:國立中山大學
系所名稱:光電工程學系研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2020
畢業學年度:109
語文別:中文
論文頁數:61
中文關鍵詞:頻率間隙優化系統的頻率響應子載波間干涉理論模型相關係數迴歸係數正交分頻多工
外文關鍵詞:SSII theory modeloptimize frequency response of the systemcorrelation coefficientorthogonal frequency-division multiplexing (OFDM)regression coefficientsfrequency gap
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在強度調變直接偵測 (Intensity Modulation/ Direct Detection, IM/DD)系統中,對於短距離傳輸來說,我們 在 傳送端偏好使用簡單且成本低的直接調變 DFB雷射 (Direct Modulated DFB Lasers, DMLs)。 而 本 篇 論文 討論在基於直接調變 DFB雷射的正交分頻多工傳輸系統中, 傳輸長距離所 產生 的色散 (Dispersion)與絕熱啁啾 (Adiabatic Chirp)的 相互作用 ,進而 導致 嚴重的非線性失真影響。在實驗研究中,我 們改變不同的光纖傳輸距離 (0-300公里 ),以及雷射的驅動電流 (60-100毫安培 ),導致不同的色散程度與不同的絕熱啁啾大小。由於絕熱啁啾可以用來調節因為色散引起的功率衰減,甚至可以提供功率增益,當使用特定的頻率間隙 (Frequency Gap)減輕非線性失真時, 絕熱啁啾是有益於傳輸表現。
本篇 論文主要 的 研究分為 兩部分,第一部分, 我們利用直接調變雷射為基礎之強度調變直接偵測系統的實驗數據進行建立理論模型與分析,並在正交分頻多工傳輸優化中。在考慮絕熱啁啾的影響下,直接調變雷射為基礎之正交分頻多工系統所造成的非線性失真可以表示子載波間干涉 (Subcarriers to Subcarriers Intermixing Interference, SSII)理論模型。我們結合子載波間干涉與實驗量測結果,利用子載波間干涉和接收的總雜訊之間的迴歸係數 (Regression Coefficients) 和相關係數 (Correlation Coefficient),此方法可以有效消除子載波間干涉估算出實驗系統接收端的加性高斯白雜訊,並且利用迴歸係數基於線性最小平方凝合 (Linear Least Squares Fitting)優化傳送端頻率響應。最後,我將所有的理論模型 參數 以訊 號對雜訊比表示,進而比較理論模型與實驗量測結果之訊雜比相差 (difference SNR, dSNR)可在-2 dB~+2 dB之間。第二部分, 我們先前提出在光載波和信號頻帶之間引入頻率間隙來減少基於直接調變雷射正交分頻多工系統傳輸中頻寬內非線性失真 應用於理論模型與實驗傳輸, 在傳輸距離250 公里,理論模型與實驗量測的結果大部分相差 -2 dB~+2 dB之間,而在300公里大部分相差-2 dB~+3 dB之間。在所有距離,最大傳輸資料量大部分差距為2 Gbps (10%差距量)以內。在傳輸距離275公里80 mA實驗結果有與沒有頻率間隙傳輸資料量提升約10 Gbps (95.7%提升量),而理論模型傳輸資料量提升約10.6 Gbps (130.5%提升量)。
We prefer to use a simple and low-cost direct modulation DFB laser (Direct Modulated DFB Lasers, DMLs) for short-distance in the intensity modulation (IM) and direct detection (DD). This paper discusses descriptions of the interaction between dispersion and adiabatic chirp which leads to severe nonlinear distortion for long-distance transmission in an orthogonal frequency-division multiplexing (OFDM) transmission system based on a directly modulated DML. In experimental research, we explore several amounts of dispersion and adiabatic chirp, respectively, changing the distance of the fiber (0–300 km) and the bias current (60-100mA) of the laser. Since adiabatic chirp can be used to adjust dispersion-induced power fading and even give a power gain. This characteristic of adiabatic chirp be beneficial to transmission performance when reduce nonlinear distortion by appropriate frequency gap.
This thesis research is divided into two sections. First section, we use the experimental data of the DML-based IM/DD system to establish the theoretical model and analysis, and its application in the optimization of OFDM transmission.
We consider the adiabatic chirp in a DML-based OFDM system, and the dispersion-induced distortion is modeled as subcarrier-to-subcarrier intermixing interference (SSII). We combined SSII theoretical model and experimental measurement result to estimate magnitude the of SSII cancellation, such as regression coefficients and correlation coefficients between the SSII data base and the total received noises, this method can be effective eliminate SSII, and estimate the AWGN at the receiver of the experimental system. We can optimize the frequency response of the transmitter, use regression coefficients based on linear least squares fitting. Finally, the theoretical model of the simulation is expressed as Signal-to-Noise Ratio (SNR), and the difference SNR (dSNR) between the theoretical model and the experimental measurement results can be -2 dB~+2 dB. Second sections, we previously proposed to reducing in-band nonlinear distortion in DML-based OFDM transmission by introducing a frequency gap between the optical carrier and signal band, and applied to theoretical models and experimental transmission, which the dSNR can mostly between -2 dB~+2 dB and -2 dB~+3dB after 250 km and 300 km transmission, respectively. The maximum transmission data rate theoretical model and the experimental results of are within 2 Gbps (10% increase of difference) after all transmission distance (0-300 km), and the experiment and theory model can increase the data rate by up to 10 Gbps (95.7% increase) and 10.6 Gbps (130.5% increase) in transmission distance of 275 kilometers and driving current of 80 mA.
論文審定書 i
致謝 ii
中文摘要 iii
Abstract v
目錄 vii
圖目錄 ix
第一章 緒論 1
1-1 前言 1
1-2 研究動機 2
第二章 直接調變強度偵測系統 4
2-1 正交分頻多工技術 4
2-1-1 正交分頻多工之簡介 4
2-1-2 正交分頻多工之原理 4
2-1-3 正交分頻多工之優缺點 5
2-2 強度調變直接偵測 9
2-2-1 強度調變直接偵測簡介 9
2-2-2 直接調變DFB雷射 10
2-2-3 光二極體 11
2-3 光纖通訊網路系統 13
2-3-1 光纖通訊技術 13
2-3-2 色散 13
2-3-3 啁啾 14
2-3-4 功率衰減 14
第三章 直接調變雷射為基礎之強度調變直接偵測系統建模 16
3-1 理論模型之建模方法 16
3-1-1 子載波間干涉 16
3-1-2 優化系統的傳送端響應 18
3-1-3 估算系統的加性高斯白雜訊 20
3-2 減少非線性失真影響 21
3-2-1 頻率間隙 21
第四章 實驗結果與討論 23
4-1 實驗架構 23
4-2 實驗結果與討論 25
4-2-1 優化系統的頻率響應與分析 25
4-2-2 藉由頻率間隙以分段方式傳送估算實驗系統的加性高斯白雜訊 30
4-2-3 比較實驗系統與理論模型之訊雜比 33
4-2-4 當使用頻率間隙比較實驗系統與理論模型之訊雜比與最大資料傳輸量 36
結論 47
參考文獻 48
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