使用光纖環形共振器之窄線寬單縱模光纖環形雷射之研究

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研究生：	張庭瑒 Chang, Ting-Yang
論文名稱：	使用光纖環形共振器之窄線寬單縱模光纖環形雷射之研究 Study of Narrow-Linewidth Single-Longitudinal-Mode Fiber Ring Laser Incorporated with Fiber Ring Resonators
指導教授：	王立康 Wang, Li-Karn
口試委員:	黃承彬 Huang, Chen-Bin 劉文豐 Liu, Wen-Feng
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 光電工程研究所 Institute of Photonics Technologies
論文出版年：	2023
畢業學年度：	111
語文別：	中文
論文頁數：	55
中文關鍵詞：	單縱模、光纖雷射、窄線寬
外文關鍵詞：	Single-Longitudinal Mode, Fiber Laser, Narrow linewidth
相關次數：	點閱：4 下載：0
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本論文利用光纖環形共振器製作出窄線寬且穩定的單縱模摻鉺光纖環形雷射。雷射主要由光纖耦合器製成的單耦合光纖環形共振器(SCFR)和雙耦合光纖環形共振器(DCFR)組成。SCFR與DCFR分別為寬頻的模態濾波器和窄頻寬的通帶帶寬的模態濾波器，兩者藉由游標尺效應，能夠有效抑制多縱模。因此我們得到1.8 kHz的窄線寬雷射，72.9 kHz的頻率跳動幅度與訊雜比達22 dB的單縱模雷射。再藉由改變DCFR的長度與反射率，可得到不同的結果。實驗結果顯示增加DCFR的長度能夠使雷射線寬變窄至1.3 kHz，而降低DCFR的反射率能夠使雷射輸出功率變大1.5倍且頻率跳動幅度降低為原本的38%。最後我們在雷射線寬與頻率跳動幅度稍微變差的情況下，透過自製腔外放大系統放大5.3倍的光功率。以上雷射架構皆由常見的元件製成，降低實驗成本，並且以帶通濾波器(BPF)取代布拉格光纖光柵(FBG)，使雷射不受環境溫度以及噪音影響。由於本論文製作出窄且穩定的單縱模雷射，因此可以用來當作相敏光時域反射儀(Phase-Sensitive OTDR)的光源。

In this investigation, we present a narrow-linewidth and stable single-longitudinal-mode (SLM) erbium-doped fiber laser with fiber ring resonators. It consists of a single-coupler fiber ring resonator (SCFR) and a double-coupler fiber ring resonator (DCFR) which are formed by fiber couplers. The SCFR possesses a wide pass-band bandwidth and the DCFR possesses a narrow pass-band bandwidth. The combination of SCFR and DCFR is employed as a high-quality mode filter to eliminate unnecessary longitudinal modes, due to the vernier effect. By using a fiber ring structure incorporated with an SCFR and DCFR, we obtained a single-longitudinal-mode fiber laser. A linewidth of 1.8 kHz with the optical signal to noise ratio of 22 dB and the one-hour frequency drift of 72.9 kHz was achieved.

摘要    i
ABSTRACT    ii
致謝    iii
目錄    iv
圖目錄    v
第一章 序論    1
1. 1 研究背景    1
1. 2 研究動機與目的    2
1. 3 文獻回顧    3
1. 4 論文架構    13
第二章 實驗原理    14
2. 1 單耦合光纖環形共振器(Single-Coupler Fiber Ring Resonator)    14
2. 2 環形共振腔的參數    16
2. 3 雙耦合光纖環形共振器(Double-Coupler Fiber Ring Resonator)    17
第三章 實驗配置    20
3. 1 雷射架構    20
3. 2 量測系統    22
第四章 實驗結果與討論    26
4. 1 光纖環形雷射    26
4. 2 改變DCFR共振腔的長度    33
4. 3 改變DCFR共振腔內的反射率    39
4. 4 光纖環形雷射與自製腔外放大系統    45
第五章 結論    51
參考文獻    53





                                

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