Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Performance Analysis of Asynchronous 2.5 Gbps / 622Mbps Optical Subscriber Network with Manchester coded Downstream and NRZ upstream re-modulation

맨체스터 부호로 코딩된 하향신호의 재변조를 이용한 비동기 2.5 Gbps / 622 Mbps 광가입자 망의 성능 분석

  • 박상조 (서원대학교 정보통신공학과) ;
  • 김봉규 (한국전자통신연구원 바이오센서팀)
  • Published : 2009.06.25
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Abstract

We propose an asymmetrical 2.5 Gbps / 622 Mbps bidirectional optical subscriber network with Manchester coded downstream and NRZ (Non-Return-to-Zero) upstream remodulation. The proposed system has important characteristics in the optical network unit (ONU): it does not require a light source or the usual control circuits such as wavelength control and output power control, and it is possible to use a synchronization scheme between upstream and downstream data. We theoretically analyze BER(Bit Error Rate) performance of upstream data remodulated with Manchester coded downstream according to the types of NRZ downstream data and perform simulations with MATLAB. The BER performance and the receiver sensitivity have been improved by 3 dB by adjusting threshold levels compared to the conventional receiver. The results have shown the remodulation scheme with Manchester coded downstream could be a useful technology for asynchronous and asymmetric optical subscriber networks with low cost and simple structures.

맨체스터 부호로 코딩된 하향신호의 재변조를 이용하여 가입자내에 광원을 필요로 하지 않고 파장 및 전력제어회로를 제거할 수 있어 가입자 장치를 단순화시킬 수 있고, 상하향 데이터간의 비동기가 가능한 비대칭 2.5 Gbps / 622 Mbps의 광가입자 망을 제안한다. 하향 데이터의 형태에 따른 재변조한 상향신호의 평균오차율을 이론적으로 분석하고, 매트랩을 이용한 시뮬레이션에 의해 그 효용성을 분석한다. 제안시스템에서 SNR의 변화에 따라 임계치를 최적치로 설정할 경우 고정된 종래의 광수신기에 비하여 평균오차율이 향상되고, 수신감도도 3 dB 향상된다. 따라서 하향신호의 재변조를 이용한 제안 시스템을 경제적이고 단순구조를 가지는 광가입자 장치에서 비동기 및 비대칭 쌍방향 데이터 전송에 유용한 방식임을 알 수 있다.

Keywords

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