Studies on repeaterless WDM transmission system considering increase in the number of wavelength up to twelve

Abstract

A repeaterless WDM transmission system having twelve 10Gbits/s-signal wavelengths, four wavelengths in 1.53μm band and eight wavelengths in 1.55μm band, is proposed. Using two wavelength bands lead to advantages of the utilizability of the wide wavelength range to avoid the nonlinear interaction between neighboring channel, and ease of demuxing by wavelength selective couplers. BER's for the transmission experiment through a 100-km dispersion shifted fiber show well balanced characteristics among wavelengths and additional optical power margin of 9dB. The same constitution as the 12-WDM system is applied to the cases of 4-WDM and 8-WDM transmission. The BER properties of these cases are similar to those for 12-WDM case. This confirms that the present WDM system structure is useful for increasing transmission capacity without changing the system construction.