| 摘要 |
The invention relates to a method for controlling the transmission performance of an optical transmission line (OL) with tuneable group velocity dispersion compensation means (C1, C2, C3) comprising at least one dispersion pre-compensation device (C1) and one further dispersion compensating device (C2,C3) within said line and/or at the lines end, wherein the dispersion compensation means (C1, C2, C3) are set to achieve a certain residual dispersion at the lines end for a minimisation of the effect of group velocity dispersion without considering the impact of non linear phase modulation along the line, the signal quality degradation effects due to a non-linear phase modulation along said line (OL) is calculated for said setting and further for at least one further alternative setting with the same residual dispersion, the results of said calculations are compared to find an optimum setting of said dispersion compensation means (C1, C2, C3), and an optical transmission system and a control facility therefore. <IMAGE>
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