Journal of the Institute of Electronics Engineers of Korea SD (대한전자공학회논문지SD)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Analysis of Intermodulation Distortion for Wavelength-Dependence Transmission Experiment of a Feedforward Analog Optical Transmitter with External Light Injection Method in WDM/SCM RoF Systems

WDM/SCM RoF 시스템에서 광 주입 기술을 적용한 피드포워드 아날로그 광송신기의 파장차이에 따른 상호변조 왜곡성분의 특성 분석

  • Moon, Yon-Tae (School of Electrical and Electronic Engineering, Chung-Ang University) ;
  • Choi, Young-Wan (School of Electrical and Electronic Engineering, Chung-Ang University)
  • 문연태 (중앙대학교 전기전자공학부) ;
  • 최영완 (중앙대학교 전기전자공학부)
  • Published : 2008.05.25
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Abstract

We have experimentally demonstrated the transmission performance of a feedforward optical transmitter using an external light injection technique. The feedforward compensation method shows 31 dB intermodulation distortion suppression and 2.2 dB noise reduction. A high side-mode suppression ratio exceeding 35 dB of the wavelength of the locked Fabry-Perot laser diode was obtained over 12 nm ranges. The suppression characteristics of the intermodulation distortion for various wavelength differences and transmission lengths were measured and analyzed as the evaluation criteria for the system performance in WDM/SCM based radio-over-fiber systems.

레이저 다이오드의 비선형성으로 인해 발생하는 왜곡성분들을 제거하기 위해 피드포워드 선형화 기법을 적용한 광송신기를 제작하였다. 레이저 다이오드의 파장차이에 따른 광전송 실험을 위해 광 주입 기술을 피드포워드 기법에 적용하여 3차 상호변조 왜곡성분(IMD3)의 크기변화를 측정하였다. 광 전송길이 및 레이저 다이오드의 파장차이로 인해 생기는 위상 부정합 현상을 분석하고 이에 따른 IMD3의 크기변화를 시뮬레이션 및 측정 하였다. 그리고 IMD3의 억제량의 변화를 극복하기 위해 정량적인 위상 가변량을 계산하였으며, 시스템 설계시 고려해야 할 가이드라인을 제시한다.

Keywords

References

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