新型光纖雷射之研製及其在有線電視與分碼多工系統中之應用

Study of Novel Fiber Lasers and Their Applications for CATV and CDMA Communication Systems

邱先成(Shien-Cheng Chiou)

指導教授 ： 曹士林

元智大學/工程學院/電機工程學系/碩士(2001年)

摘要

本文提出兩種利用寬頻光源所組成之新型光纖雷射及一種新型波長可調光纖雷射，其寬頻光源是由摻鐠光纖放大器與半導體光放大器串接而成：第一種為結合兩組2´2光電調變器組合而成的主動光纖耦合環與一寬頻光源所形成之新型雙埠光纖雷射，其中主動光纖耦合環是當作雷射共振腔反射端面而寬頻光源是當作增益介質之用；第二種則是利用一窄線寬之光纖光柵代替第一種光纖雷射中一組2´2光電調變器所形成之光纖雷射其目的可增大輸出雷射功率；此外若將第二種光纖雷射中之光纖光柵置換成波長可調光濾波器則可形成一種光纖波長可調雷射。
接著，我們將新型光纖雷射應用於有線電視系統與一種混合型光纖通訊網路中，考慮不同雜訊項對系統的影響進而分析整體之訊噪比，並進行系統效能評估，其中，此種混合型光纖通訊系統是由類比有線電視系統與數位分碼多工系統組合而成。藉由數值分析結果，我們可以得知如何改善系統效能的方向，並且此架構的可行性也將獲得證實。

關鍵字

光纖雷射 ； 摻鐠光纖放大器 ； 半導體光放大器 ； 光電調變器 ； 波長可調光濾波器 ； 有線電視 ； 分碼多工系統

並列摘要

In this thesis, 1.3mm broadband optical light source(BOLS) is implemented. This BOLS is achieved by cascading a Praseodymium Fluoride fiber amplifier (PDFA) and a semiconductor optical amplifier(SOA). Then, we study a continue wave (CW) fiber laser using two symmetric active fiber loop mirrors. The optimal laser output conditions can be search by adjusting the driving voltage of the active fiber loop mirrors. The theoretical model we built show good coincidence with the experimental results. Besides, a novel fiber laser with a non-symmetric resonant cavity that includes an active fiber loop mirror and a narrow bandwidth fiber grating mirror. The lasing characteristics of the fiber laser are experimentally studied with analyzing the DC driving voltage of the active fiber loop. Furthermore, a wavelength tunable fiber laser with non-symmetric cavity is implemented. The wavelength can be tuned and the modulation bandwidth can reach 1.4 GHz. Moreover, we apply the fiber laser with two symmetric active fiber loop mirrors in the CATV system. We will simulated the carrier to noise ratio by way of the numerical analysis. Then, we apply the same fiber laser to a new fiber communication system that includes the CATV and CDMA. And then the CATV analog signal and CDMA digital signal are transmitted together in our fiber laser. Finally, with the numerical curves, the various applications of our systems can be analyzed and the feasibility of these new architectures can be also verified.

並列關鍵字

Fiber laser ； PDFA ； SOA ； E/O modulator ； Tunable optical filter ； CATV ； CDMA

參考文獻

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