Abstract:

In order to obtain the critical condition of fibre Raman am plifier,an equation describing the threshold power of the am plifier is deduced when considering the energy transfering from pumping-light to signal-light.The maximum fibre loss and the minimum fibre length in critical condition are also calculated.All these above-men tioned results are then compared with the results in literature and the results obtained by recent experiments.indi-caring that the proposed threshold equation is more rigorous.Finally,the optimal pumping power and fibre length are obtained,which can be used for the design of fibre Raman amplifier.

Key words: optical communication technology, Raman threshold, stimulated Raman scattering, fibre Raman am-plifier