The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Investigation of Performance Limitations of SCM/WDM Systems Using Optical DSB Modulation and 16 QAM Signals

광 이중 측파대 변조 방식과 16 QAM 신호를 이용한 부반송파/파장 분할 다중화 시스템의 성능 분석에 대한 연구

  • Kim, Kyoung-Soo (Department of Computer and Radio Communications Engineering, Korea University) ;
  • Lee, Jae-Hoon (Department of Computer and Radio Communications Engineering, Korea University) ;
  • Jeong, Ji-Chai (Department of Computer and Radio Communications Engineering, Korea University)
  • 김경수 (고려대학교 컴퓨터.전파통신공학과) ;
  • 이재훈 (고려대학교 컴퓨터.전파통신공학과) ;
  • 정지채 (고려대학교 컴퓨터.전파통신공학과)
  • Published : 2009.01.31
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Abstract

In this paper, we investigate the performance limitations of SubCarrier Multiplexed(SCM) WDM systems using optical Double-Side Band(DSB) modulated 16 QAM signals. The Bit-Error Rate(BER) performance is evaluated under various optical transmission links including the effects of the dispersion and fiber nonlinearities such as SPM(Self-Phase Modulation) and XPM(cross-phase modulation). After simulation of SCM-WDM systems, the dominant factors determining the entire system performance are appeared to be the nonlinearity of MZ(Mach-Zehnder) modulator and the SCM channel spacing. The BER performance of subcarrier channels in the higher frequencies was degraded with the large dispersion effect only, however, the performance was improved a little with a combined effect of fiber dispersion and nonlinear effect when the hish fiber launching power was applied.

본 논문에서는 광 이중 측파대역 변조 방식과 16 QAM(Quadrature Amplitude Modulation) 신호를 이용한 부반송파/파장 분할 다중화 시스템의 성능을 부반송파 채널 간격, 누화 전력 량(crosstalk power), BER(Bit-Error Rate) 특성을 통해 연구하고 있다. 광 전송 링크에서 분산 특성과 자기 위상 변조, 상호 위상 변조와 같은 비선형 현상을 고려하였을 때 BER특성을 살펴보았다. 컴퓨터 시뮬레이션 결과, 부반송파/파장 분할 다중화 시스템의 성능을 결정짓는 주도적인 인자는 마흐-젠더 변조기의 비선형 특성과 부반송파 채널 간격으로 관찰되었다. 광섬유의 분산에 의한 영향만 고려했을 때는 전송거리가 증가함에 따라 높은 주파수에 있는 부반송파 채널의 BER 성능이 나빠졌으나, 분산과 비선형 효과를 함께 고려되었을 경우 광섬유에 입사하는 전력이 클 때 높은 주파수에 있는 부반송파 채널에서 약간의 BER 성능 향상을 확인할 수 있었다.

Keywords

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