有著低雜訊與寬頻增益的背向泵激光纖拉曼放大器 (Backward-Pumped Fiber Raman Amplifier)，近年來被認定為一項可用於光纖通信系統中的技術。光纖拉曼放
大器主要被注目於它可彈性控制放大增益的頻寬與光增益的頻譜位置。

在多波長光網路中，非平坦寬頻光源所造成的通道波長功率變動會帶來些問題。在分波多工 (WDM) 系統中，通道波長功率變動會加強接收端光信號的嚴重下降並且使得在傳輸管理上更為困難。再頻域振幅編碼的光分碼多工 (SAC-OCDMA) 系統中，通道波長功率變動會造成接收端嚴重的多重存取干擾 (MAI) 問題。因此，動態增益等化器再多波長光網路中，扮演了一個重要的腳色，因為它有著能控制每個通道波長光功率頻譜的能力，因此能維持一個高的服務品質 (quality-of-service, QoS) 並且提供更具彈性的傳輸管理。

再本論文中，我們提出應用背向泵激光纖拉曼放大器於多波長光網路中作動態等化研究。從模擬結果得知我們提出的等化架構在多波長光網路中是簡單且有效的。

Backward-pumped fiber Raman amplifier (FRA) has recently been recognized as an enabling technology for optical fiber communication system with its low noise and broad gain bandwidth characteristics. The FRA has experienced increased attention for their flexible control of bandwidth and spectral position of optical gain.

In the multiwavelength optical networks, the power variance of wavelength channels caused by nonflattened broadband light source brings some problems. In the wavelength division multiplexing (WDM) system, the power variance of wavelength channels imposes a severe degradation on the optical signal at the receivers and makes difficulty in transmission management. In the spectral-amplitude coding optical code division multiple access (SAC-OCDMA) system, the power variance of wavelength channels causes severe multiple-access interference (MAI) problem at the receivers. Hence, dynamic gain equalizers play an important role in multiwavelength optical networks, because of their ability to control the power spectrum profile of the wavelength channels, therefore maintaining a high quality-of-service (QoS) and providing more flexibility in transmission management.

In this thesis, dynamic equalization in multiwavelength optical networks by using backward-pumped fiber Raman amplifiers is presented. The simulation result shows our proposed scheme is simple and effective in multiwavelength optical networks.

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