Channel power pre-equalization method in heterogeneous multi-band transmission networks [Invited]

To reduce the effect of inter-channel stimulated Raman scattering in multi-band transmission, we propose a method to pre-equalize the input power to a transmission line solely on the basis of basic optical fiber parameters and the number of accommodated wavelengths in multi-band transmission using two wavelength bands. This proposed method was applied to an optical fiber transmission line installed in a field environment. After four spans of transmission using a cutoff shifted fiber (G.654.E), the signal quality (Q value) was 1.9 dB higher than when the method was not applied.