Abstract
Recently, ultra-wideband (UWB) wavelength-division multiplexing (WDM) technique has been introduced to increase the data transmission capacity of optical system using the same infrastructure fibers. This capacity increase will raise the effect of fiber nonlinearity and stimulated Raman scattering (SRS) due to the increase of total launch power and operating wavelength band, respectively. This paper presents comprehensive investigation of UWB spectral characteristics of the fiber nonlinear interference (NLI) in dual-polarization (DP)− 16QAM S+C+L system. The investigation is based on enhanced Gaussian noise (EGN) model and takes into account the wavelength dependence of various fiber parameters. The results are used as a guide line to assess the transmission performance of the system under different values of symbol rate Rs (50–80 GBaud). The results reveal that a maximum transmission reach of 13 100 km-spans is achieved for Rs= 50 GBaud and 75 GHz channel spacing.
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