Dispersion Limit Improvement Of FM/TM Signals By Self-phase Modulation

Simulations of unrepeatered transmission of 10 Gbit/s signals generated by frequency to intensity modulation conversion show an improvement of the dispersion limit on standard fiber due to self-phase modulation by up to a factor of 2.5. This indicates a 1 dB limit of above 100 km for optimum modulation index of 0.5. For this index, simulations indicate the existence of a maximum allowable input power around +18 dBm, above which the channel breaks down. This also applies for dispersion shijied fiber, even at a lower power of around +14 dBm.