Journal of the Korean Institute of Telematics and Electronics S (전자공학회논문지S)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Analysis of Transmission Characteristics for Cascaded WDM Optical Add / Drop Multiplexers with Crosstalk , ASE Noise , and Extinction Ratio

WDM 광 분기 / 결합 시스템에서의 누화 , ASE 잡음 , 소광비가 전송특성에 미치는 영향분석

  • Lee, Sang-Rok (Electronics and Telecommunications Research Institute) ;
  • Seo, Wan-Seok (Electronics and Telecommunications Research Institute) ;
  • Lee, Sung-Un (Electronics and Telecommunications Research Institute)
  • Published : 1999.02.01
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Abstract

We analyze the transmission performance of WDM system based on cascaded optical add/drop multiplexers. The considered factors degrading the performance in this paper include the intra-channel corosstalk caused from space switches and demultiplexers/multiplexers, the amplified spontaneous emission noise, and the extinction ratio. To ensure the power penalty within 1dB, the extinction ration more than 13dB, the switch corosstalk less than 39dB, and the demultiplexer/multiplexer crosstalk less than 20dB are required. Under the assumption of switch corosstalk less than 30dB, performance degradation due to the ASE noise is dominant compared to the crosstalk. With the fixed decision threshold in an optical receiver, the maximum number of cascaded nodes reduces to a half compared to the case of the optimum decision threshold.

OADM이 다단 연결된 WDM 망에서 전송성능을 분석하였다. 주된 전송선능 열화요소는 광스위치와 광역다중화기/다중화기의 누화, ASE 잡음, 그리고 소광비 등이 있다. IdB power penalty를 허용할 경우 소광비는 13dB 이상, 광스위치 누화는 -30dB 이하, 광 역다중화기/다중화기 누화는 -20dB 이하로 유지해야한다. 광스위치 누화가 보다 지배적이다. 광수신기의 판정 임계치가 고정값인 경우에는 전송 가능한 최대 노드수가 최적값이 경우보다 약 50% 이상 감소한다.

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