复用器/解复用器滤波特性研究

Study on Filter Performance of MUX/DEMUX

研究了复用器 解复用器 (MUX DEMUX)滤波特性对光网络系统的影响。考虑了滤波器的带通特性 ,在噪声为高斯分布的前提下 ,分析了光网络节点对传输速率为 10Gbit s的光信号的影响。结果表明 ,光网络节点传输函数中央平坦区域的微小抖动 (0 .2dB～ 0 .5dB) ,引起系统性能的严重恶化 ,最坏情况下功率代价增加 2dB～ 6dB ;并且中央区域凹陷个数不同 ,对系统性能的影响也不同 ,引起功率代价的差别达到 1dB～ 5dB。

Multiplexer/demultiplexer′s impact on optical network system is studied. 10 Gbit/s optical system′s degradation caused by optical nodes is identified. Noise distribution is assumed as a Gauss one. The transmission function of optical node is considered as a band pass function. The central region of this band pass function is always not as flat as the ideal function. It causes the degradation of system performance severely. The system penalty is 2 dB～6 dB on the condition of 0.2 dB～0.5 dB variation. Also the difference of the flaw makes discrimination of penalty. The discrimination is 1 dB～5 dB considering the amplitude and rank of variation.