Patent ID: 9621277
Date: 2017-04-11
CPC Classifications: H04B,H04J,H04L

Claim:
1. A method for pre-distorting an optical signal, intended to be transmitted over an optical transmission line having a configuration and comprising a plurality of frequency division multiplexed optical sub-carriers, said optical signal being obtained from optical conversion of an electrical signal comprising a plurality of frequency division multiplexed electrical sub-carriers, the method comprising: storing several sets of corrective factors in association with several possible optical transmission line configurations; recovering, from among the stored sets, a set of corrective factors for the respective electrical sub-carriers, which are associated with a configuration corresponding to the configuration of the optical transmission line, each of the corrective factors of the recovered set being a function of a first parameter that is dependent on the power of the respective sub-carrier; and applying the recovered set of corrective factors to amplitudes of the respective electrical sub-carriers, so as to equalize, at an output of said optical transmission line, values of the first parameter for the sub-carriers of the optical signal.