Oguchi, "Wide wavelength band (1535-1560 nm and 1574-1600 nm), 28 x 10Gbit/s WDM transmission over 320 km dispersion shifted fiber
," Electronics Letters, Vol.
An important observation which can be made from Figure 4, Figure 10, Figure 15 and Figure 20 is that although the trends of ASE noise and FWM noise are opposite, still the total optical noise has followed the trend of FWM emphasizing that FWM is the major contributor of noise in WDM fiber optic system with inline optic amplifiers and non-zero dispersion shifted fiber
in the anomalous regime (NZDSF+) operating at 1.
As an example, by using an adjustable external cavity laser as soliton source, a soliton transmission was implemented over 8000 km of dispersion shifted fiber
through a recirculating amplified loop.