Reduction of amplified spontaneous emission noise impact on optically amplified systems in normal dispersion region of fibre

It is analytically shown that in a propagation regime with a low average normal dispersion, the interplay between the Kerr effect and chromatic dispersion can reduce the degradation due to ASE noise in NRZ optical systems. Such behaviour is confirmed by simulations in links with a chromatic dispersion, having both a constant and a sawtooth distribution.