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研究生:林晁磊
研究生(外文):Chao-lei Lin
論文名稱:低成本法布里-比洛雷射二極體光注入自動鎖模監控系統研究
論文名稱(外文):study of Low-cost Automatic Injection-Locked control System for Fébry-Perot Laser Diode
指導教授:劉政光劉政光引用關係徐世祥
指導教授(外文):Cheng-kuang LiuShih-hsiang Hsu
口試委員:劉政光徐世祥
口試日期:2012-07-20
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:光電工程研究所
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:2012
畢業學年度:100
語文別:中文
論文頁數:77
中文關鍵詞:垂直共振腔面射型雷射注入鎖模法布里-比洛雷射自動注入鎖模模態鎖定數位電視地面廣波訊號
外文關鍵詞:VCSELinjection lockingFP-LDautomatic injection lockingmode lockingDVB-T signal
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本論文探討低成本的法布里-比洛雷射二極體鎖模監控系統,以一直接調變數位電視訊號的垂直共振腔面射型雷射為注入鎖模光源,以此光源注入鎖模法布里-比洛雷射二極體,並再直接調變1.25Gbps數據資料進行上行傳輸。考慮到若法布里-比洛雷射二極體注入鎖模波長發生變動時,法布里-比洛雷射如何以低成本的方式來進行鎖模監控的技術。
第一部分使用可調式雷射光源注入隨機選取的兩顆相同的法布里-比洛雷射二極體,將可調式雷射光源波長注入法布里-比洛雷射二極體,於24.4oC時分別對準11個相對模態作注入,發現當旁模抑制比超過36dB時,其模態光功率也來到最高點。此外,每改變0.01nm及測量其輸出光譜的旁模抑制比與模態光功率,發現注入光於鎖模後,往長波長與短波長兩方向的移動,其旁模抑制比與模態光功率的變動趨勢是不一樣的,其中光功率隨波長移動的變化率相差約50dBm/nm。
第二部分改採用垂直共振腔面射型雷射注入法布里-比洛雷射二極體,進行兩種不同的測量,一為改變垂直共振腔面射型雷射的溫度,從22.8 oC開始,每0.1oC量測一次旁模抑制比與模態光功率;二為固定垂直共振腔面射型雷射的溫度於25oC,以溫度控制器改變法布里-比洛雷射二極體的溫度。實驗發現,注入光於法布里-比洛雷射二極體輸出光譜中的相對模態長波長與短波長處,鎖模後旁模抑制比與模態光功率的變動趨勢不一樣的特性。
最後,藉由上述鎖模的特性,探討以做為自動控制技術來監控注入鎖模的狀況,以及在發現波長漂移時,送出溫度修正信號來控制法布里-比洛雷射二極體的熱電冷卻器,調節其溫度,以自動追隨鎖模的機制,來達到低成本鎖模監控系統的目標。
In this thesis, a low-cost automatic injection-locking control system is presented. A vertical cavity surface-emitting laser(VSCEL),which is directly modulated with DVB-T signals, is adopted as an injection source. Using this injection source, a Fébry-Perot laser diode (FP-LD) is injection-locked and is directly modulated with 1.25Gbps NRZ data for upstream transmission. Considering the variation of the injection-locked wavelength of FP-LD, we study an injection-locking control system in a more cost efficient way. In part A , we randomly pick two FP-LDs at the same time, and use a tunable laser as an injection source. Firstly, we focus on the injections on the eleven relative modes of FP-LD at 24.4oC. It is found that when the side mode suppression ratio(SMSR) is above 36dB, the mode power reach the highest value. Secondly, as the injection wavelength changes by 0.01nm, we measure the SMSR and mode optical power of the optical spectrum. From our study of the injection factures, it found that the features of the variations of SMSR and mode power are different as the wavelength increased or decreased. In part B, similar study are made of replacing the tunable laser by a VCSEL. Two kinds of experiments were performed. The first one was performed at several temperatures, staring from 22.8oC to 24.8oC with an increment of 0.1oC. We measure the SMSR and mode power. The second experiment is at a fixed temperature of 25oC for the VCSEL. We change the temperature of FP-LD by a temperature controller. In the experiment, similar conclusion is reached. The injection locking features are different as the wavelength increased or decreased. Finally, using the above mode-locking characteristics, we design a low-cost automatic injection-locking system. As the wavelength of the injection source drift, the control system responds by sensing the output light power of the FP-LD. Then, a correction signal was send to the temperature controlling circuit to vary the wavelength of the FP-LD,until the mode-locking condition are achieved.
論文摘要 I
Abstract III
誌謝 V
目錄 VI
圖索引 X
表索引 XIII
第一章 緒論 1
1.1前言 ........... 1
1.2研究動機 .... 3
1.3論文架構 ... 5
第二章 相關組件技術介紹……………………………………………..6
2.1垂直共振腔面射型雷射(Vertical Cavity Surface-Emitting Laser; VCSEL) ………………………………………………………………….6
2.2法布里-比洛雷射二極體(Fabry-Perot Laser;FP Laser) 7
2.3數位通訊量測參數 9
2.3.1訊雜比 9
2.3.2明滅比 10
2.3.3眼形圖 10
2.4光注入鎖模技術介紹 11
第三章 低成本FP雷射二極體光注入組件特性分析 16
3.1簡介…………………………………………………………………16
3.2法布里-比洛雷射二極體特性分析 16
3.2.1溫度對法布里-比洛雷射二極體之影響 16
3.2.2直調法布里-比洛雷射二極體傳輸特性 18
3.3可調式雷射光源注入各模態鎖模過程之光譜特性分析 20
3.3.1可調式雷射光源注入鎖模實驗架構 20
3.3.2可調式雷射光源注入法布里-比洛雷射二極體(編號為
FP-1)各相對模態鎖模光譜特性分析 22
3.3.3可調式雷射光源注入法布里-比洛雷射二極體(編號為
FP-2)各相對模態鎖模光譜特性分析 32
3.4光注入鎖模過程之調變訊號特性分析 36
3.5 討論與結論 ......................................................................................42
第四章 低成本FP雷射二極體光注入鎖模追蹤監控系統設計 43
4.1 架構簡介 …………………………………………………………43
4.2垂直共振腔面射型雷射注入法布里-比洛雷射之特性量測 44
4.2.1垂直共振腔面射型雷射之特性量測..............................................44
4.2.2光注入鎖模過程之光譜特性分析..................................................47
4.2.3光注入鎖模過程之調變訊號特性分析..........................................51
4.2.4法布里-比洛雷射二極體溫度影響................................................55
4.3.1數位電視廣播傳輸方式………………………………………….57
4.3.2地面廣播技術簡介……………………………………………….57
4.3.3數位機上盒………………………………………………………58
4.4實驗架構………………………………………………………………………………………59
4.5自動鎖模控制設計 62
4.5.1 自動鎖模控制簡介.........................................................66
4.5.2比例(P)控制 66
4.5.3積分(I)控制 66
4.5.4微分(D)控制 69
第五章 結論............................................... 73
5.1成果與討論..............................................73
5.2未來研究方向 74
參考文獻 75
作者簡介 77
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