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Amplified spontaneous Raman scattering and gain in fiber Raman amplifiers

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2 Author(s)
Dakss, Mark L. ; GTE Laboratories, Inc., Waltham, MA, USA ; Melman, Paul

The spectrum of amplified spontaneous Raman scattering and gain in a fiber Raman amplifer has been calculated analytically as a function of distance and pump power. The model used makes no assumptions on the magnitude of the gain and considers the pump nondepletion region. From the results, the on/off ratio has been calculated and is found to have a variation with length that depends on frequency detuning. An enhancement in on/off ratio is also found for small fiber lengths but at limited gain. The use of a narrow-bandpass optical fiber leads to quite different behavior of the on/off ratio than for the unfiltered case.

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Lightwave Technology, Journal of  (Volume:3 ,  Issue: 4 )