METHOD AND ARRANGEMENT FOR DETERMINING SIGNAL DEGRADATIONS IN THE PRESENCE OF SIGNAL DISTORTIONS

摘要

The invention relates to a method and several arrangements for determining signal degradations of an optical signal transmitted in a transmission signa l in the presence of signal distortions, wherein at least one part of the optical signal is fed to an adaptive optical or electric filter at a place o f measurement in the transmission system and is subsequently measured accordin g to one or several quality parameters. A first measurement of the quality parameter is carried out by transparent adjustment of the adaptive filter an d other measurements of the quality parameters are carried out with predefined transparency properties of the adaptive optical filter which respectively ha ve an influence upon signal distortions. As a result it is possible to analyze or to separate signal-influencing effects or groups of effects. In another embodiment of the invention, the filter parameters of an optical/electric equalizer or filter structure, which are adjusted by said analysis, are described according to optimization of the signal quality.