INTENSITY AND FREQUENCY NOISE TRANSMISSION ALONG SINGLEMODE FIBER AT ZERO-DISPERSION WAVELENGTH

A rigorous small-signal theory for linear and dispersive singlemode fi bre communication systems operating at the zero-dispersion wavelength is presented. From this theory, the intensity and frequency noise tran smission along the singlemode fibre is assessed. The new theory shows excel:lent consistency with accurate numerical simulations of intensit y and frequency noise spectra after singlemode fibre transmission. The oretical and simulation results show that fibre transmission at zero-d ispersion wavelength leads to intensity and frequency noise spectra at fibre output, similar to intensity and frequency noise spectra, respe ctively, at the input to the fibre. Accordingly, at zero-dispersion wa velength, second-order dispersion effects on the intensity and frequen cy noise are irrelevant even for ultra-high bit rates and long-haul fi bre links.