dition is satisfied when the guard band is integer m times of subcarrier spacing . Here, we show a generalized study of the influence of guard band to the system performance. We first verify through experiment the validity of the orthogonality condition that minimizes the inter-band interference (IBI).РThe experiment setup is the same as Fig. 3. Due to the IBI the subcarriers at the two edges of each band bear the largest inter-band penalty. Fig. 10(a) and (b) shows the SNR sensitivity performance of the “edge subcarriers”(the first and the last subcarrier of the band) as a function of the guard band normalized to the subcarrier spacing, at the back-to-back and 1000-km transmission with 1 dBm launch power. For simplicity, only one polarization is presented. The system signal-to-noise ratio
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