臺灣博碩士論文加值系統

自由空間光通訊(FSO)是一種光通訊技術。利用光在自由空間中進行無線通訊傳輸，可用於互聯網、電信通訊和電腦網路。自由空間光通訊被發展來創造一個高速率、高安全性與便利性的高頻寬光訊號，能取代RF射頻訊號。
隨著寬頻互聯網、電信通訊和電腦網路的普及，數據中心的傳輸負載也持續地增加。FSO 有著許多具有吸引力的特點，像是可以提供靈活且易於安裝與高實用的通訊技術，基於它們對電磁波干擾的免疫力以及免授權費的操作。
在本論文中展示了高密度分波多工/空間分割多工自由空間光通訊，利用16個波長，將每一個波長載入了25 Gbps的數據流。使其有著400 Gbps的傳輸速率，在自由空間中傳輸100公尺。據我們所知，這是第一個採用高密度分波多工/空間分割多工技術，所建構之400 Gbps自由空間光通訊系統，同時傳輸距離達到100 公尺。

The free-space optical (FSO) link is an optical communication technology that uses light propagating in free space to transmit data wirelessly for the internet, telecommunications, and computer networking. An FSO link is developed to create a high-speed, high-security, and friendly link with a highbandwidth light signal instead of a radio frequency signal.
FSO links have many attractive characteristics, as they can provide flexible, easy-to-install, and practical links due to their intrinsic immunity to electromagnetic interference and their license-free operation. As the popularity of broadband internet, telecommunications, and computer networking services increases, so does the transmission loading of data centers.
Due to the omnipresent use of third/fourth generation mobile communications, smartphone users are increasing, and there is heavy transmission loading in data centers. A suitable data transmission approach should be deployed to overcome heavy transmission loading for cloud server connections.
This study demonstrates a DWDM/SDM FSO link by using a 16-wavelength system, with each wavelength carrying a data stream of 25 Gbps. A DWDM/SDM FSO link with a total transmission rate of 400 Gbps (25 Gbps/λ × 16λ = 400 Gbps) over a 100 m free-space link is established. To the best of our knowledge, this is the first time that a 400 Gbps/100 m DWDM/SDM FSO link with a doublet lens scheme has been constructed successfully.

摘 要 i
ABSTRACT ii
誌 謝 iv
目 錄 v
圖目錄 vii
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機與目的 2
1.3 論文架構 2
第二章 系統元件介紹 3
2.1 雷射介紹 3
2.1.1 分佈式回饋雷射 3
2.1.2 垂直共振腔面射型雷射 4
2.1.3 自發性輻射放大寬頻光源 5
2.2 馬赫-曾德調變器 5
2.3 摻鉺光纖放大器 7
2.4 光纖準直器 8
2.5 可調式光衰減器 9
2.6 光檢測器 9
2.6.1 P-I-N 光電二極體 10
2.6.2 雪崩光電二極體 12
2.7 光交織器 13
2.8 低雜訊放大器 13
2.9 時脈資料回復器 14
第三章 系統原理與系統參數介紹 15
3.1 自由空間光通訊原理 15
3.2 分波多工系統原理 16
3.3 高密度分波多工原理 17
3.4 空間分割多工原理 18
3.5 雙合透鏡系統 20
3.6 調變原理 21
3.6.1 調變原理及種類介紹 21
3.6.2 直接調變 23
3.6.3 外部調變 24
3.7 訊號品質分析 25
3.7.1 誤碼率 25
3.7.2 眼圖 26
第四章 400 Gbps/100 m 自由空間光通訊傳輸系統 32
4.1 文獻回顧與實驗簡介 32
4.2 實驗架構 36
4.3 實驗結果分析 38
4.4 結語 48
第五章 結論與未來展望 50
參考文獻 51
Publication List 58
縮寫名詞對照表 60

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