System with optical amplifier

摘要

The present invention relates to an optical system comprising firstly an optical amplifier (11), which comprises at least one input and at least one output, secondly a control circuit for regulating the output power of the amplifier (11) with the aid of a feed-forward process demand signal (PF), said control circuit comprising a feed-forward block (14) and a first means (13) for tapping light from the input of the amplifier (11 ) to the feed-forward block (14). According to the invention, the feed-forward block (14) is arranged to measure the total optical input power.