The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Analysis and Compensation of I/Q Amplitude Imbalance In Coherent PON Systems

코히어런트 PON시스템의 I/Q 진폭불균형 분석 및 보상

  • Kim, Nayeong (Electronics Engineering Department, Kookmin University) ;
  • Lee, Seungwoo (Electronics Engineering Department, Kookmin University) ;
  • Park, Youngil (Electronics Engineering Department, Kookmin University)
  • Received : 2015.07.12
  • Accepted : 2015.10.13
  • Published : 2015.10.31
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Abstract

An optical coherent system is considered for the next-generation optical access networks in enhancing the data rate and transmission distance. In this system, however, I/Q amplitude imbalance may occur at several parts of the system, leading to serious performance degradation. Asymmetric structure of a coherent receiver at the location of subscriber is one of the sources of I/Q imbalance. Therefore, this imbalance parameters must be removed or compensated to secure the transmission performance. In this paper, the source of I/Q amplitude imbalance is analyzed, and then the way to compensate for the imbalance at the receiver side is suggested. Performance after the compensation is estimated using simulation.

차세대 광가입자망시스템에서는 전송속도 및 전송거리 향상을 위해 코히어런트 광전송 시스템이 검토되고 있다. 그런데 이 전송방식의 경우 I/Q 불균형 요인에 의해 전송 성능 저하를 일으킬 수 있으며, 가입자 수신부 내부 구조의 비대칭성은 I/Q 진폭불균형의 주 요인이 될 수 있다. 따라서 안정적인 전송 성능 보장을 위해서는 이런 불균형 성분을 제거하거나 보상해주어야 한다. 본 논문에서는 I/Q 진폭불균형의 원인 및 전송 성능에 미치는 영향을 분석하고, 수신부에서 발생하는 I/Q 진폭불균형 요인을 보상하는 방식을 제시하였다. 또한 시뮬레이션을 통해 제안한 방식의 성능을 보인다.

Keywords

References

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