現今光纖傳輸系統要求高速率傳輸，高速率的傳輸則會使光纖中出現極化模色
散(Polarization Mode Dispersion, PMD)，而 PMD 會引起脈衝畸變,進而導致傳
輸品質下降。為了要滿足訊號在光纖中高速傳輸的需求，在本篇論文中提出了
一種使用最小均方法(Least Mean Square, LMS)均衡器來補償 PMD 的傳輸系
統，利用反饋機制與估計訊號品質的方法，進行調節原本存在的誤差使接收到
的訊號更接近原本傳輸的訊號。此系統比其他使用傳統 PMD 補償方法的系
統，有更好的傳輸品質，同時還可以降低系統的複雜度。本論文採用
OptiSystem 光纖通訊模擬程序，實現了一個在光纖通訊系統中利用 LMS 均衡
器補償 PMD 的體系結構，並對其加以深入分析，針對眼圖(eye diagram)和品質
因子(Q factor)以及 BER(bit error rate)去進行分析並與其他使用傳統方法補償
PMD 的系統進行比較，以驗證在系統中使用 LMS 均衡器補償 PMD 的性能
與優勢。

Optical fiber communication can meet the need of the increasing demand of high
data rate transmission. But the time and space varying birefringence in optical fibers
causes polarization mode dispersion (PMD) in optical fibers that can be a serious
problem that might lead to pulse distortion and transmission quality degradation in a
high data rate transmission. In this thesis, a PMD compensation method based using a
least mean square (LMS) equalizer is proposed to mitigate the pulse distortion and
quality degradation. The LMS equalizer uses a decision feedback mechanism to
estimate the transmitted signals, compensate for errors and restore the received signals
to the initial status. An optical fiber transmission system with the proposed LMS
equalizer can have better transmission quality and lower complexity. In this thesis, a
PMD compensation transmission system which uses a LMS equalizer is analyzed and
implemented by the OptiSystem simulation program. The system performance
factors, viz., the eye diagram, the Q factor and the BER are analyzed and compared
with different PMD-compensation techniques to validate the strength of the proposed
PMD compensation transmission system.

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