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An Approach to Flatten the Gain of Fiber Raman Amplifiers with Multi-Pumping
The effects of the pumping wavelength and their power on the gain flattening of a fiber Raman amplifier (FRA) are investigated. The multi-wavelength pumping scheme is utilized to achieve gain flatness in FRA. It is proposed that gain flatness becomes better with increase in number of pumping wavelengths applied. We have achieved flat gain with 0.27 dB fluctuation in a spectral range of 1475-1600 nm for a Raman fiber length of 10 km by using six pumps with wavelengths with in the 1385-1495 nm interval. The effect of multi-wavelength pumping scheme on gain saturation in FRA is also studied. It is proposed that gain saturation condition gets improved by using this scheme and this scheme is more useful for higher spans of Raman fiber length.
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[1] Y. Cao, J. Schenk and M. A. Fiddy, “Third order nonlinear effect near a degenerate band edge”, Optics and Photonics Letters, Vol 1, pp. 1-7, 2008.
[2] Lovkesh , S. S. Gill, “Ultrahigh-speed optical signal processing based on single SOA at 60 Gb/s,” OPTIK-International Journal of Light & Optics, Vol. 122, Issue 11, pp. 978-985, June 2011
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[12] Victor E.Perlin, and Herbert G. Winful, “Optimal design of flat-gain wide band fiber Raman amplifiers”, IEEE Journal of Lightwave Technology, Vol.20, No.2, pp.250-254, 2002.
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[19] Adish Bindal & Surinder Singh, “Optimization of fiber Raman amplifier in a gain saturation regime” International Journal of Optical Engineering, Vol. 51, Issue 1, pp. 015005-1-6, Jan. 2012.
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