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A theoretical model of noise—amplified spontaneous emission and Rayleigh backscattering—in few-mode fiber Raman amplifiers is presented in this letter. Based on this model, the equalization of the signal modal gain determines the equalization of the noise modal gain. The model can also be used to predict the mode-dependent optical signal-noise ratio. The theoretical results of this model are consistent...
We present a theoretical model of amplified spontaneous emission noise in few-mode fiber Raman amplifiers. Under the undepleted-pump approximation, equalization of modal gain also ensures equalization of OSNR. This modal allows the prediction of mode-dependent OSNRs in the saturated-pump regime. The experimental results are in good agreement with theoretical estimations.
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