In order to efficiently use the available optical bandwidth efforts are under way to achieve spectral efficiencies of at least 0.8 bits/s/Hz. For such spectrally efficient systems (considering co-polarized WDM-channels) the importance of filtering for different modulation formats, different channel bitrates from 10 - 160 Gbit/s and different dispersion map designs will be discussed. It turns out that the optimisation strategy for spectrally efficient WDM systems shows considerable differences to single channel systems. The specific modulation format and the chosen channel bitrate turn out to be of minor importance, thus enabling simple analytic expressions for the achievable system performance.
In this paper we investigate the transmission performance of 16Nx10 Gb/s, 4Nx40 Gb/s and Nx160 Gb/s DWDM systems with equal spectral efficiency (0.8 bit/s/Hz). For a comparison between different systems optimized filter, fiber settings as well as optimized dispersion compensation scheme have been used. It is shown that if the considered amount of photons per bit is constant all investigated systems show similar transmission characteristics.
In this paper the results of the numerical investigations for different modulation formats in 40 Gb/s based WDM transmission systems over standard single mode fiber (SSMF) are present. The aim of our works was a precise investigation of the transmission behavior of 40 Gb/s WDM systems considering different modulation formats in linear and nonlinear transmission regime. Thereby the maximum achievable spectral efficiency for each modulation format has been analysed.
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