近來光纖中OH- 離子去除的技術突破，使得光纖之可使用頻寬從1.3 μm拓展至1.6μm，然而目前所常用的單一光纖放大器均無法涵蓋整個1.3 μm~1.6μm頻寬範圍。最近，摻鉻光纖已被證實擁有1.3 μm至1.6μm的寬頻螢光頻譜，其極具有發展成為超寬頻放大光源的潛力。
本研究以Cr:YAG作為纖芯(core)，採用管中棒(rod in tube, RIT) 的方法來製作預型體，再利用商用抽絲塔的製程加上預型體管內的壓力控制來製作摻鉻光纖。目前已成功抽出纖芯為16μm及26μm的光纖絲，其自發性輻射頻譜所展示出來的譜線，涵蓋了1.2到1.55μm的波段，輻射功率強度也已提升至在1w的激發能量下每nm長度平均有2.5nw的自發輻射。所研發摻鉻光纖展示的300nm之頻寬能完全覆蓋1.3到1.6μm的常用通訊波段，本研發製程的好處在於其光纖生長速度快、纖芯直徑均勻及真圓度好，極適合於商業化量產，因此研發摻鉻光纖擁有極大的潛力被應用於的超寬頻的光纖放大器上。

The breakthrough technology in dry fiber fabrication has opened the possibility for using fiber bandwidths all the way from 1.3 to 1.6μm. However, the fiber amplifier used in commercial product, such as erbium-doped fiber amplifier (EDFA), can not fully cover the whole fiber bandwidths from 1.3 to 1.6μm with a single fiber amplifier. Recently, the Cr4+-doped fiber has shown a broadband emission from 1.3 to 1.6μm. Therefore, it is interesting to develop a single fiber amplifier which can operate the wide bandwidth of the 1.3~1.6μm emission.

In this study, we have successfully fabricated and measured the Cr-doped fibers by using a commercial drawing-tower technique and a rod-in-tube method. The core diameters were 26 and 16μm. The Cr4+ fluorescence spectrum showed a broadband emission from 1.2 to 1.6μm. The radiation intensity was up to the order of nW. This indicates that the new Cr-doped fibers may be used as a broadband fiber amplifier. The advantages of using the drawing tower to fabricate the Cr-doped fibers are to have a better control of the core diameter, the fiber uniformity and circularity. Therefore, the Cr-doped fibers may have a potential for commercial production and application to lightwave communication systems.

中文摘要 I
Abstract II
致謝 III
內容目錄 IV
圖目錄 VI
表目錄 X
第一章 緒論 1
第二章 Cr4+:YAG晶體光纖的特性 10
2.1 Cr4+：YAG的晶體結構與特性 10
2.2 Cr4+：YAG的能階模型與吸收及放射頻譜 15
第三章 Cr4+：YAG晶體光纖之製作 19
3.1 文獻探討 19
3.2 抽絲塔製造Cr4+：YAG晶體光纖 22
3.2.1 商用抽絲塔介紹及抽絲過程 22
3.2.2 Cr4+：YAG預型體製造及其製程 31
第四章 Cr4+：YAG晶體光纖之量測 43
4.1 摻鉻光纖端面之研磨拋光 43
4.2 Cr4+：YAG晶體光纖之折射率量測 48
4.3 Cr4+：YAG晶體光纖之EPMA成分分析 51
4.4 Cr4+：YAG晶體光纖之自發輻射頻譜 54
4.5 Cr4+：YAG晶體光纖之遠場量測 60
第五章 結論與未來工作 62
5.1 結論 62
5.2 未來工作 63
參考文獻 65

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