AMPLIFIED OPTICAL RING TRANSMISSION SYSTEM

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A ringed optical transmission system (10) comprises along the ring (11) rare earth doped fiber amplifiers (12). The system has a gain peak with a λASE wavelength outside the λ1-λn band of the channels transmitted along the ring and said wavelength corresponds to an ASE emission peak of the amplifiers in the ring. In this manner a lasing peak forming a gain stabilization signal is produced.