25 Gbaud/s PAM-4調變電路整合於光傳輸模組｜國立臺灣科技大學博碩士論文系統

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研究生：	羅科閔 Ke-Min Luo
論文名稱：	25 Gbaud/s PAM-4調變電路整合於光傳輸模組 Integration of 25Gbaud/s PAM-4 Modulation Circuits for Optical Transmitters
指導教授：	李三良 San-Liang Lee
口試委員:	李三良 San-Liang Lee 黃凡修 Fan-Hsiu Huang 周一鳴 YI-MING Chou 曾昭雄 Chao-Hsiung Tseng 楊淳良 Chun-liang Yang
學位類別：	碩士 Master
系所名稱：	電資學院 - 電子工程系 Department of Electronic and Computer Engineering
論文出版年：	2019
畢業學年度：	107
語文別：	中文
論文頁數：	78
中文關鍵詞：	調變電路、光傳輸模組
外文關鍵詞：	25Gbaud/s, Optical Transmitters
相關次數：	點閱：192 下載：2
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上一筆

因應高速傳輸通訊的需求，如何增加通道頻寬與資料量已成為研發技術的重點。相較於NRZ訊號，PAM-4訊號只需使用一半頻寬便能以相同的數據速率進行傳輸，且有較低的非均勻通道之相關損耗，因此使用PAM-4訊號進行傳輸無疑是一種更可行的解決方案。
本論文成功展示PAM-4調變驅動晶片，能產生良好的25 Gbaud/s PAM-4電訊號，並利用偏壓控制輸出眼圖的振幅準位，依據其模擬與量測結果，討論有無驅動電路及輸入訊號之速率、振幅、延遲時間變化的表現，從而判斷量測誤差的可能原因並給予改善方向。
最後，本論文探討將上述驅動IC與電致吸收調變雷射進行整合模擬，主要利用電致吸收調變雷射的等效電路模型，得以模擬完整的光傳輸模組傳輸訊號時的情況，並探討模組最佳化的方式，其結果將有利於後續實現400 Gb/s的光傳輸模組。

Increasing the channel bandwidth and data rates is the main focus of research and development in optical communication industry to meet the demands of high-speed optical transmission and interconnect. Compared to the NRZ signal, PAM4 signals require half the bandwidth to transmit at the same data rate and have lower channel-dependent loss, so they have become a feasible solution for transmission at high data rates.
This paper successfully demonstrates the PAM-4 modulation driver IC to provide 25 Gbaud/s PAM-4 signals. The driver IC allows to change the bias voltages to control the four level of the output eye diagram. Based on the simulation and measurement results, we discussed the performance for adjusting the operation parameters, including the baud rate of input signals, signal amplitude, and the delay time. The measurement with and without a buffer circuit is also compared. We then investigate the difference between the simulation and measurement for the future improvement of the modulation circuits.
This thesis also presents the co-simulation of an electroabsortion-modulated laser (EML) and its driving circuits by adopting an equivalent circuit for the EML. This allows to optimize and realize an EML-based optical transmitter. The results lay a foundation for the subsequent implementation of 400 Gb/s optical transceivers.

摘要    I
Abstract    II
致謝    III
目錄    V
圖目錄    VIII
表目錄    XII
第一章    導論    1
1 前言    1
2 研究動機    2
3 文獻探討    4
4 論文架構    10
第二章    調變訊號PAM-4介紹與模擬    11
1 前言    11
2 訊號調變方式    11
2.1 不歸零編碼訊號調變訊號    11
2.2 四階脈衝振幅調變訊號    13
2.3 PAM-4傳輸系統的挑戰    15
3 PAM-4 調變驅動IC介紹    17
3.1 PAM-4調變電路介紹    17
3.2 PAM-4調變電路模擬    18
3.3 PAM-4調變電路佈局與成品    21
第三章    PAM-4調變驅動IC量測與分析    24
1 前言    24
2 PAM-4調變驅動IC量測架構    25
3 PAM-4調變驅動IC量測結果    26
3.1 驅動電路(Buffer)之影響    26
3.2 不同速率下之量測結果    29
3.3 量測結果分析與優化方向    35
第四章    光傳輸模組驗證與優化    41
1 前言    41
2 光傳輸模組    42
2.1 傳輸線設計與偏壓電路    43
2.2 EML TOSA電路    45
2.3 光傳輸系統模擬與量測    49
3 EML內部回授影響    50
3.1 EML小訊號等效電路模型    50
3.2 經EML頻率響應之NRZ眼圖模擬    52
3.3 經EML頻率響應之PAM-4眼圖模擬    60
4 EML等效電路模組優化    65
4.1 EML之頻寬優化    65
4.2 EML之阻抗優化    68
4.3 光傳輸模組優化之挑戰    71
4.4 PAM-4調變電路結合光傳輸模組    74
第五章    結論    75
1 成果    75
2 未來研究方向    76
2.1 400Gb/s光傳輸模組    76
2.2 TOSA模組    76
參考文獻    77

                                

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