波長轉換器是全光網路中最關鍵的核心技術之一，利用非線性效應所製作的波長轉換器具有高的透明性及多通道的頻域轉換，因此有助於疏通高容量的網路訊號，比傳統光電-電光轉換的傳輸模式具有更大的優勢。

本論文利用鈮酸鋰晶體光纖製作波長轉換元件，利用LHPG法外加電場，在不需製作光罩電極的情形下，製作出週期性極化反轉之鈮酸鋰晶體光纖，針對不同的應用，設計C band通訊波段波長轉換元件之QPM週期為18.9 μm，以及利用串接效應所產生的可調藍/綠光元件之QPM週期為15.45 μm，製作過程中藉由微擺動擺幅比的控制，增加極化反轉的形成，晶體生長長度可達180 mm。針對藍綠光元件所設計之週期性鈮酸鋰晶體光纖，藉由串接倍頻與和頻的效應，經中研院實驗量測，倍頻的轉換效率可達10%，且有40 nm的可調藍/綠光輸出。經由漸變週期之模擬設計，在1530-1630 nm的幫浦波長入射至晶體時，可有3 dB頻寬33 nm的藍/綠光輸出。

在未來除了持續改進區域反轉週期的均勻度外，可藉由模擬程式去設計更寬頻的可調藍/綠光元件的結構，並且進行製作。另一方面製作具波導效果之鈮酸鋰晶體光纖，以實現高效能的準相位匹配之全光波長轉換器。

All-optical wavelength conversion will be one of the most key technologies in all-optical network. Wavelngth converter using nonlinear effect can resolve wavelength contentions with its high transparency and subcarrier-multiplexed channels in a complex all-optical network model which is more beneficial than O/E/O method.

Periodically poled LiNbO3 crystal fiber for wavelength conversion is successfully grown by LHPG method with high-electric-field bias. It does not require conducting the metallic electrode to define domain period. The pitch depends on the frequency of applied external electric field and the growth speed. Domain period of 18.9 μm for C-band wavelength converter and domain period of 15.45 μm for tunable blue/green laser are demonstrated in this thesis. Micro-swing during growth is managed to assist poling process. More than 40 nm wavelength range of blue/green laser was generated and 10% internal SHG conversion efficiency was achieved. A simulation shows that maximum tuning range using a graded-period qusai-phase-matching structure can be as large as 33 nm.

With the improvement of uniformity, broadband design for cascaded processes, and waveguide structure, superior performance of periodically poled LiNbO3 crystal fiber can be achieved.

中文摘要
英文摘要
目錄
圖目錄
表目錄
第一章 緒論

第二章 相位匹配原理與區域反轉機制

2.1雙折射相位匹配
2.2準相位匹配
2.3 鈮酸鋰晶體結構與特性
2.4 區域反轉結構製作方法

第三章 準相位匹配元件之研製

3.1 生長方式與架構
3.1.1 雷射加熱提拉長晶法
3.1.2 長晶電極與外加電場
3.2 電場導致的微擺動
3.2.1 極化反轉與微擺動機制關係
3.2.2 微擺動的控制
3.3 元件製作流程

第四章 數值模擬與準相位匹配元件特性

4.1 C-band 波長轉換元件設計與量測
4.1.1 C-band 波長轉換元件設計
4.1.2 量測結果與討論
4.2 可調藍/綠光元件設計與模擬
4.2.1 可調藍/綠光元件機制
4.2.2 可調藍/綠光元件頻寬拓寬設計模擬
4.2.3量測結果與討論

第五章 結論

5.1 總結
5.2 未來展望

參考文獻
中英對照表
附錄：模擬程式

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