| 摘要 |
<p>The present document relates to optical transmission systems. In particular, the present document relates to a method and apparatus for the estimation of the carrier phase and for the estimation of the degree of non-linear distortions incurred in an optical transmission channel. The method comprises providing a plurality of signal samples at succeeding time instances; wherein the plurality of signal samples is associated with a modulation scheme and a carrier phase; wherein the plurality of signal samples has been transmitted over the optical transmission channel; wherein the plurality of signal samples comprises a plurality of signal phases, respectively; wherein the plurality of signal phases comprises a plurality of data phases and a plurality of residual phases, respectively; wherein the plurality of residual phases is associated with the carrier phase. The method comprises further canceling (401) the plurality of data phases from the plurality of signal phases by taking into account the modulation scheme; thereby yielding the plurality of residual phases; and determining (301) a set of autocorrelation values of the plurality of residual phases for a set of lag values, respectively; thereby yielding-a measure for the non-linearity of the optical transmission channel.</p> |
