研究生: |
王儷娟 Li-chann Wang |
---|---|
論文名稱: |
交叉極化調變為主之波長轉換器 Wavelength Converters Based on Cross-Polarization Modulation |
指導教授: |
李三良
San-Liang Lee |
口試委員: |
廖顯奎
Shien-Kuei Liaw 吳靜雄 Jing-shown Wu 李揚漢 Yang-Han Lee 楊淳良 Chun-Liang Yang |
學位類別: |
碩士 Master |
系所名稱: |
電資學院 - 電子工程系 Department of Electronic and Computer Engineering |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 84 |
中文關鍵詞: | 交叉極化調變 、波長轉換器 、功率動態範圍 、啁啾 |
外文關鍵詞: | cross polarization modulation, wavelength converter, power dynamics, chirp |
相關次數: | 點閱:158 下載:2 |
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波長轉換器為全光網路中的關鍵元件,能將原始信號轉換至其他波長上,可有效提升網路效能、解決波長阻塞問題及增加網路中波長使用的彈性。
本論文主要探討半導體光放大器中的交叉極化調變機制,利用此一物理機制製作波長轉換器並找出波長轉換器的最佳工作條件及功率動態範圍。以一對一交叉極化調變波長轉換器而言,以誤碼率10-9下的功率償付値小於1 dB的基準來看,輸入信號光功率的動態範圍約6 dB;而一對二的情況則有5 dB的動態範圍。此外我們也與交叉增益調變機制之波長轉換器做比較,發現交叉極化調變的波長轉換器對功率變化並不會特別敏感。
在10 Gb/s傳輸特性方面,交叉極化調變機制之轉換信號,在功率償付値小於1 dB的基準下,可傳輸距離達40 km的距離;但交叉增益調變機制轉換之信號,並無法進行長距離的傳輸,這主要是因為啁啾效應為正的特性,加強了傳輸中的色散效應,導致波形嚴重失真所致。在此我們提出以交叉極化調變機制改變交叉增益調變轉換信號在啁啾效應之極性,促使轉換信號在傳輸30 km後仍可維持清晰的眼形圖。在適當的信號光功率控制下,也可提升交叉增益調變轉換信號之明滅比,使得該轉換機制在傳輸應用上更具可行性。
The wavelength converter is a key component in all optical networks. The function of a wavelength converter is to convert the original signal from one wavelength to another wavelength. It can reduce the wavelength blocking problems and provide flexible services for optical networks. In this thesis, we utilize the cross-polarization modulation (CPM) mecha-nism in a semiconductor optical amplifier (SOA) to realize high-perfor-mance wavelength converters.
We first investigate the operation conditions and power dynamics for CPM wavelength converters. A CPM wavelength converter can have about 6-dB and 5-dB dynamic ranges for 1:1 and 1:2 wavelength conver-sion, respectively. The performance of XGM wavelength converters is also investigated for comparison with CPM wavelength converters.
From the transmission experiments, we obtain the clear eye patterns with less than 1-dB power penalty when the signal is CPM-converted and transmitted over 40-km distance. On the other hand, the signal converted by the XGM mechanism can only transmit for a short distance due to the positive chirp that enhances the dispersion effect via a SMF. In order to improve the performance of a XGM converter, we insert a CPM con-verter after the XGM converter in order to use the negative chirp to com-pensate the XGM converted signal. With this scheme, the XGM con-verted signal can be transmitted over 30-km transmission.
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