隨著社會影音訊息化，人們對訊息的需求日愈據增，此一需求直接的推動以通訊網主要傳輸方式的光纖傳輸朝向高資料傳輸速率、大容量以及長距離傳輸的方向迅速發展。由於光纖放大器的出現，光纖損耗已不再是限制光纖傳輸距離的主要因素，色散逐漸引起人們的重視。色散引起數位光脈衝訊號在傳輸過程當中展寬，導致符元干擾(ISI)，故傳輸系統誤碼率(Bit Error rate)提升，進而限制了通信容量和通信距離進一步增長。尤其在單波道速率為40Gbit/s以及40Gbit/s以上之高密度多波分工(DWDM)系統，對每個波道進行精確的動態色散補償非常的重要。光纖色散監測作為動態及時色散補償之基礎，故發展此一方面研究更是刻不容緩之議題。於此論文所提出之利用既有訊號產生器時脈的光纖色散監測方式，並進行詳細的理論推導以及實際量測。本論文的研究工作對提高系統傳輸容量，增加光纖傳輸之容量，最終實現高效能低成本的色散管理光纖網路有著重要理論與實踐之意義。
為了區分正和負的色散數值，典型的方法是通過兩個部分具有相反的色散元件的總色散做分析。於此提出一個簡單的方法並說明，目前此方式只能實現小色散元件如+85 ps / nm或-85 ps / nm的色散測量，利用當光分路器連接一色散量並與原來的色散量各別做監控。並利用量測所獲得的兩曲線相減之差值曲線以判別色散正負數值。

The current need for the information society is requiring the high speed, large capacity and long transmission distance in fiber optical communications. Because of the significant improvement in the optical fiber amplifier, the attenuation is not the main factor inhibiting the optic fiber communication system for long transmission. Instead, the chromatic dispersion (CD) will cause the inter symbol interference, deteriorate the bit error rate, and limit the communication capacity and transmission distance. Particularly, in the dense wavelength division multiplexing system with the channel bit rate over 40 Gbit/s, it’s very important to dynamically monitor the CD and compensate it in an effective manner.
In this paper, the clock from original pattern generator was utilized for CD monitoring in theory analysis and experimental characterization. The research work included the improvement in the optic fiber communication system capacity and transmission distance with high performance CD management. In order to achieve low dispersion besides the real-time monitoring, the accumulated CD value was compensated by the laboratory-made CMOS compatible all-pass optical ring resonator.
In order to distinguish the positive and negative dispersions, a typical way was to use the functions of splitting and transmission through two sections with opposite dispersive elements for total dispersion reading. A simple approach was proposed and illustrated to only implement a small dispersive element, such as 85 ps/nm, on to the additional optical CD monitor, which was connected with the original dispersive monitoring by the optical splitter. For the CD monitoring, the 850 ps/nm was presented and the positive dispersion was simultaneously demonstrated.

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