臺灣博碩士論文加值系統

在波長多工光纖通訊系統中，於零色散波長附近的波道處，都受到小相對群速度及低色值，造成嚴重的交互相位調變與四波混合，導致傳輸品質變差的結果。本論文針對這個問題，做理論上的研究及改善的方法。適當的使用信號預先瞬時頻率調變將脈衝變寬，利用零色散波長變動增加相對群速度及與相位不匹配，以及去除零色散波長附近的波道，減少四波混合，這些都可以改善系統的性能。以本論文的參數為例，假如依循下列幾個條件，每一10-Gb/s信號波道在傳送1,500-km後，每個波道的傳輸品質Q因子皆有6以上的表現:適當的信號預先瞬時頻率調變，零色散波長變動範圍±15-nm，與去除最靠近零色散波長的三個波道。

In a WDM fiber communication system, the signal channels near zero-dispersion wavelength experience small relative group velocity and low dispersion. These result in worse signal quality that is due to serious cross-phase modulation (XPM) and four-wave mixing (FWM). This thesis theoretically studied these effects and proposed the performance improvement methods. By properly utilizing signal pre-chirping for pulse broadening, variation of zero-dispersion wavelength for increasing relative group velocity and phase mismatching, and removing signal channels near zero-dispersion wavelength for reducing FWM, we can significantly improve the system performance. With the numerical parameters used in this thesis, the Q factor of every 10-Gb/s signal channel can be above 6 after 1,500-km transmission if the following strategies are used: proper signal pre-chirping, ±15-nm zero-dispersion wavelength variation, and the remove of the three signal channels that are most close to nominal zero-dispersion wavelength.

中文摘要……………………………………………………………..….…i
英文摘要…………………………………………………………..……….ii
致謝…………………………………………………………………..….…iii
目錄……………………………………………………….………..………iv
圖目錄………………………………………………………………………vi
第一章 緒論…………………………………………………….…….……1
第二章 理論背景
2-1 光纖傳輸波動方程式…………………………………………..….2
2-2 信號的瞬時頻率……………………….…………………..….……..2
2-3 光纖色散造成的瞬時頻率…………………….…………….……..3
2-3-1 線性效應…..……………………………….……………….….…4
2-3-2 非線性效應…………………………………….………….……...5
2-4 光纖傳輸系統品質的評估…………………………………….…...5
第三章 傳輸系統架構………………………..….…………………….8
3-1 輸入信號…………………………………………………………......8
3-2 傳輸光纖………………………………………………………...…...8
3-3 色散補償光纖……………………………………………………..…9
3-4 摻鉺光纖放大器………………….……………………………….…10
第四章 如何在零色散波長處有效的使用波道及提高傳輸品質………....11
4-1 考慮實際傳輸光纖零色散波長的變動……………………………...11
4-2在傳輸光纖色散值較高的情形.……………………………………..12
4-3 去除零色散波長附近波道提高傳輸品質…………………………...13
第五章 結論………………………………………………………………..15
參考文獻…………………………………………………………………....16

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