FIELD: optical transmitting systems.
SUBSTANCE: modulated optical signals S1, S2 being transmitted are synchronized with respect to one another or shaped so that phase difference for NRZ-modulated signals is at least about 0 deg. and for RZ-modulated ones, at least about 180 deg. They can be also shaped by means of various synchronizing devices.
EFFECT: reduced permanent degradation of polarization-multiplexed signal without limiting throughput transfer capacity.
15 cl, 8 dwg
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