Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Theory of optimal second-order PMD compensation

최적의 2차 편광모드분산 보상에 관한 이론적 고찰

  • Published : 2003.12.01
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Abstract

In this paper, the optimal performance of optical second-order polarization mode dispersion (PMD) compensation has been investigated theoretically in terms of minimization of the root-mean-square (RMS) pulse broadening. The optimal compensation vector in feedforward-type second-order PMD compensation has been derived, and the RMS pulse broadening factor after the optimal second-order PMD compensation has been analytically calculated. The calculated result has been compared with the previously reported simulation result where numerically optimized feedback scheme was adopted. They are in good agreement, which verifies the validity of the derivation. The investigation in this work will form the basis for the implementation of the feed-forward-type second-order PMD compensation.

본 논문에서는 피드포워드(feedforward) 방식의 2차 편광모드분산 보상에 있어서 보상 장치에서 발생시켜야 할 최적의 보상 벡터를 펄스 폭 증가율을 최소화함으로써 이론적으로 유도하였다. 최적의 2차 보상 벡터는 전송 선로의 편광모드분산 벡터의 단순한 Taylor전개식과는 달리, 편광모드분산 벡터와 출력 신호 편광의 주파수 평균들의 선형 조합으로 표현됨을 밝혔다. 최적의 2차 편광모드분산 보상에서의 펄스 폭 증가율을 해석적으로 계산하였으며, 계산 결과를 전산 모의 실험에 의한 결과와 비교하여 일치함을 확인하였다. 본 논문에서 유도한 최적의 2차 보상 벡터에 관한 공식은 피드포워드 방식의 2차 편광모드분산 보상에 반드시 필요한 정보를 제공한다.

Keywords

References

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