Patent ID: 6188508
Filing Date: 2001-02-13
Classification: H04B

Abstract:
A control signal superimposer for superimposing a control signal on a signal light, comprising:a pumping light source for generating a pumping light with intensity fluctuations in accordance with the control signal;a Raman amplification medium pumped by the pumping light from the pumping light source for Raman-amplifying the signal light, said Raman amplification medium having output light comprising a light signal component and a pumping light component;a combiner for combining the pumping light from the pumping light source and the signal light to be Raman-amplified and supplying such combined light to the Raman amplification medium; andan optical filter for extracting the signal light component from the output light of the Raman amplification medium and terminating the pumping light component.