Studies on Dynamic Gain Equalization of WDM Signals in Erbium- Doped Fiber Amplifier

• Main Authors: Tsai, Tsung-Li, 蔡宗歷
• Other Authors: Huang Jen-Fa
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/43507598992009804294

碩士 === 國立成功大學 === 電機工程學系 === 86 === Recently, it is an optimal system configuration to improve the performance of optical transmission system by applying EDFA( Erbium-Doped Fiber Amplifier)and WDM(Wavelength Division Multiplexing) techniques. We can repeat the opticalpower directly by utilizing EDFA, and have not to make E/O conversion. WDM is atechnique that can use the wide band fully to upgrade the channel capacity. Butthere are several problems to overcome in such a system. One of them is the gainvariation of EDFA due to the change of optical channels. Besides, in long distance transmission, how to compensate the variation through a chain of EDFAis another problem. In this thesis, we design to solve the gain variation due to the change of the number of optical channel mainly. First, we review the concept of automatic gain control mentioned before and some methods to achieve the goal. After talking about the advantages and disadvantages of these methods, we introducea new approach and make some comparisons. This new method has higher compensation performance. We design several control loops to present ourcompensation methods. In long distance transmission system, we also apply thismethod to stabilize the gain variation.