Telefonaktiebolaget Lm Ericsson (publ)

Bo Lagerstr&ouml;m

Bengt Johansson

Gunnar S Forsberg

Dag Bonnedal

Magnus &Ouml;berg

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

System with optical amplifier

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

Growing community of inventors

Skärholmen, Sweden

Bo Lagerström

Growing community of inventors

Skärholmen, Sweden

Bo Lagerstr&ouml;m

Bo Lagerström