這篇論文是針對面射型半導體雷射（Vertical-Cavity Surface -Emitting Laser ,VCSEL）的偏振切換現象作一連串的研究，我們由理論模擬和實驗兩方面著手，進行改變回饋光的種類與強度的研究，藉以觀察VCSEL偏振切換的變化情形，實驗中挑選了一顆具有明顯的偏振切換遲滯現象的VCSEL，探討光回饋和偏振切換現象的交互作用。實驗結果與理論預測相當的吻合，這些結果還可以利用線性增益模型（Linear Gain Model ,LGM）的圖示分析得到很好的詮釋。在偏振切換的遲滯迴路之研究方面，實驗發現VCSEL在遲滯迴路中的固定電流之下，也會發生偏振切換，而且光回饋會影響偏振切換的延遲時間，隨著回饋光量的增加而延遲時間縮短，得到了切換延遲時間與回饋光強度呈指數遞減的關係。在小範圍電流調變連續偏振切換的研究中，實驗得到光回饋可以改善電流驅動偏振切換（Current Driven Polarization Switching ,CDPS）成功率，明顯地提高CDPS的頻寬。在大範圍電流變化的方面，實驗發現隨著頻率增加，電流增加時的切換電流(Iu)和電流下降時的切換電流(Id)相比，Iu往高電流延遲切換的情況比較明顯，Id的變化比較小。這些研究讓我們對VCSEL的偏振切換現象有更進一步的了解。

This research accomplished a series of investigations on the polarization switching of Vertical-Cavity Surface-Emitting Lasers (VCSEL). The research was preceded experimentally and theoretically to observe the variation of the VCSEL’s polarization switching under various polarization optical feedback and various feedback ratios. A VCSEL with significant polarization-switching hysteresis loop was employed in the experiments to study the interaction between the optical feedback and polarization switching. The experimental results matched the theoretical simulations very well. These results could be interpreted with the graphic analysis of the linear gain model of the VCSEL. In the investigation of the polarization-switching hysteresis loop, experiments found that, inside the loop and at some constant current, the polarization switching would be conducted with a switching delay time. The switching delay time was shortened under stronger optical feedback, revealing an exponential dependence between the switching delay time and optical feedback ratio. In the experiments of small current modulation to continuously switch the laser’s polarization, optical feedback could improve the success of the current-driven polarization switching, significantly enhancing its bandwidth. For a large-range tuning of the laser’s current, as the current modulation frequency increased, the polarization-switching current in the increasing-current process would significantly shift toward the high current end, while the polarization-switching current in the decreasing-current process was affected less. These results greatly contribute to the understanding of the VCSEL’s polarization switching.

中文摘要
英文摘要
致謝辭
目錄
圖表目錄

第一節 簡介.............................................1
第二節 雷射簡介與速率方程................ 6
第三節 VCSEL的偏振研究 ...................19
第四節 實驗架設與實驗方法 ................37
第五節 實驗結果與討論 ........................45
第六節 模擬結果討論.............................63
第七節 結論.............................................75
參考資料..................................................77
附錄 分光鏡使用說明.............................78

1. Cheng, Da-Long, Tsu-Chiang Yen, Wei Chang, Wang-Chuang Kuo, Kuo-Sheng Kao and Chuan-Pi Hsu “Polarization mode-hopping suppression and performance enhancement by optical feedback in a current-driven polarization switching VCSEL”, IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 19, NO. 24, DECEMBER 15, 2007

2. Danckaert ,J., B. Nagler, J. Albert, K. Panajotov, I. Veretennicoffa, T. Erneux,” Minimal rate equations describing polarization switching in vertical-cavity surface-emitting lasers” Optics Communications 201 (2002) 129–137

3. Hong, Y., Rui Ju, Paul S. Spencer, and K. Alan Shore” Investigation of Polarization Bistability in Vertical-Cavity Surface-Emitting Lasers Subjected to Optical Feedback” IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 41, NO. 5, 619-624,MAY 2005

4. Hong, Y., Jon Paul, Paul S. Spencer, and K. Alan Shore, Senior Member, IEEE,” Influence of Low-Frequency Modulation on Polarization Switching of VCSELs Subject to Optical Feedback”, IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 44, NO. 1, JANUARY 2008

5. Lang, R. and Kohroh Kobayashi, “External Optical Feedback Effects on Semiconductor Injection Laser Properties” IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. QE-16, NO. ,3 MARCH 1980

6. Panajotov K., Boris Ryvkin, Jan Danckaert, Michael Peeters, Hugo Thienpont, and Irina Veretennicoff,” Polarization Switching in VCSEL’s Due to Thermal Lensing”, IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 10, NO. 1, JANUARY 1998

7. Yen ,Tsu-Chiang,Wang-Chuang Kuo , Da-Long Cheng , Jin-Ing Tsai and Chuan-Pi Shu “Optical feedback assistant current-driven polarization switching of VCSELs”, Proc. SPIE, Vol. 7135, 71350O



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