The propagation of intensity-modulated signal in an cascaded optical amplifier conventional simple mode fiber system is numerically analyzed
taking self-phase modulation (SPM)
group-velocity dispersion (GVD)
amplifier spontaneous emission (ASE) into account. The effect of GVD and SPM are reduced by dispersion compensation fibers (DCF’s). The simulation show if dispersion is well-compensated and amplifier spacing is decreased to 50 km