Optical fibre transmission system with Raman amplification

摘要

The system has a pumping source (12) comprising two sources (14, 16) generating pumping lights at different wavelengths. A modulator (18) applies amplitude modulation to the sources (14, 16). The sources (14, 16) present a temporal decorrelation between envelopes of the lights. The sources are adapted to vary the temporal decorrelation between the envelopes during propagation of an optical signal in an optical fiber. The pumping light generated by the source (14) is adapted to pump the optical signal by Raman effect. The pumping light generated by the source (16) is adapted to pump the pumping light generated by the source (14), by Raman effect. An independent claim is also included for a method of Raman amplification of an optical signal in a dispersive propagation medium.