SYSTEM WITH FEEDBACK CONTROLLED OPTICAL AMPLIFIERS

摘要

The present invention relates to an optical system comprising, firstly an optical amplifier (11), comprising at least one input and at least one output, secondly a control circuit for controlling the output power of the amplifier (11) with the aid of an output process demand signal (PD) from a control means (15). The control circuit comprises control means (15), a detector block (14) and a means (13) for tapping off light from input or output of the amplifier (11) to the detector block (14). According to the invention, at least one check signal (A) is disposed to be sent in at least one check signal channel, which is disposed to pass through the amplifier (11). The detector block (14) is disposed to measure the amplitude of the control signal(s) (A).