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標題: | 高速垂直共振腔面射型雷之光電特性探討與優化 Investigation and Optimization of the Opto-electrical Characteristics of High-Speed Vertical-Cavity Surface-Emitted Lasers |
作者: | Chun-Yen Peng 彭俊諺 |
指導教授: | 吳肇欣 |
關鍵字: | 垂直共振腔面射型雷射,等校電路模型,雜質誘發晶格失序面射型雷射,近場分析,遠場分析,面射型雷射光學特性,正交頻分多工,溫度補償面射型雷射, Vertical cavity surface emitting laser (VCSEL),Small-signal Model,impurity-induced disordered VCSEL,Near-field analysis,far-field analysis,Optical Characteristic of VCSEL,Orthogonal frequency division multiplexing,Temperature-compensated VCSELs, |
出版年 : | 2020 |
學位: | 博士 |
摘要: | 本論文探討短波長850奈米紅外光高速垂直共振腔面射型雷射元件特性與優化製程。透過數學理論、優化製程、光學特性與調變優化等方式,探討高速雷射改善方向與方法。文章共分成六章,包含了雷射發展歷史、訊號模型與萃取、製程優化改善、光學特性分析與優化高溫下調變格式等五個部分。
首先,第一章將簡單介紹面射型雷射的發展歷史與近代雷射的發展軌跡,並描繪現代雷射的發展進程與高速雷射發展方向。根據這個方向,我們在第二章重新檢視高速雷射在速率方程式與小訊號模型上的影響關鍵,並建立標準萃取流程。第三章,將透過雜質參雜誘發晶格失序的方式減低鏡面電阻並提高注入效率。實驗中,透過分析特徵溫度、理想因子與元件頻寬,描述通過製程改善前後的元件特性差異,並利用眼圖進行特性驗證。此外,考慮到耦合效率對於訊號品質的影響,第四章中將藉由光學場型與光學頻譜,探討面射型雷射發散角對於光學場型的分佈,並解析熱效應對元件的實際影響。 透過前面章節,我們注意到高溫對於雷射的影響非常嚴重,因此如何對抗溫度的影響是非常重要的議題。為了克服這個問題,本論文除了採用常見的溫度補償型雷射進行實驗,也在第五章中利用多頻正交分工的調變格式進行傳輸優化;透過多頻正交分工,我們成功達成高溫50 Gbps的傳輸結果,此外我們也首次描述多頻正交分工傳輸格式應用於溫度補償型面射型雷射的訊號變化。 經由本篇實驗,我們研究了高速雷射對於溫度效應的影響,並探討改善雷射的可能性。 The optimized process of infrared 850 nm vertical-cavity surface-emitting lasers (VCSEL) was investigated by numerical theory, optimal process, optical characteristic, and modulation format in the dissertation. The dissertation was divided into six chapters, which included the history of VCSEL, the optimized process, optical characteristics, and the optimal format of modulation. First, the development of history and the track of modern VCSEL were introduced in chapter one. The impact factors could be described by the small-signal model and the rate-equation of the semiconductor laser. Therefore, to properly illustrate the physical feature of VCSELs, the standard flow of extractions was constructed in chapter two. These analysis flows were applied to the impurity-induced disordering (IID) VCSEL, which could enhance the injection efficiency and reduce the mirror resistance through the optimal process. The characteristic temperature, the ideality factor, and the optical bandwidth were compared through the difference before and after the VCSEL through the IID process in chapter three. Additionally, considering the influence of coupling efficiency on the VCSEL, the characteristic of the divergence angle was another important issue of the high-speed transmission. Hence, in chapter four, the influences of the divergence angle were analyzed by the optical characteristic of VCSELs. Furthermore, the thermal impact of the far-field angle also was taken into account in this study. We noticed the thermal limitation on VCSELs is very severe via the previous chapter. Thus, to combat thermal limitation becomes a very important issue today. In chapter five, we tried to solve this problem by the temperature-compensated (TC) VCSEL and the modulation format of orthogonal frequency-division multiplexing (OFDM). Through cooperation between the TC VCSEL and OFDM modulation, 50 Gbps transmission was achieved at an 85 °C environment. Moreover, the temperature effect of the OFDM transmission was also investigated by the TC VCSEL in this dissertation. In summary, this dissertation studied the thermal effects of high-speed VCSELs and discussed the possibility of improvement. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/66795 |
DOI: | 10.6342/NTU202000285 |
全文授權: | 有償授權 |
顯示於系所單位: | 光電工程學研究所 |
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