METHOD AND ARRANGEMENT FOR REDUCING THE SIGNAL DEGRADATION IN AN OPTICAL POLARISATION-MULTIPLEX SIGNAL

摘要

Method for reducing signal degradation in an optical polarisation-multiplex system. The modulated optical signals (S1, S2) to be transmitted are synchronised or generated such that the phase difference for NRZ-modulated signals (S1, S2) is at least approximately 0~ and the phase difference for R Z- modulated signals is at least approximately 180~. They can also be achieved by means of different synchronising devices.