Optimization of fiber Raman amplifier in a gain saturation regime

Bindal, Adish; Singh, Surinder

doi:doi:10.1117/1.OE.51.1.015005

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Optical Engineering / Volume 51 / Issue 1 / Fiber Optics and Optical Communication

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Optimization of fiber Raman amplifier in a gain saturation regime

Opt. Eng. 51, 015005 (Feb 07, 2012); http://dx.doi.org/10.1117/1.OE.51.1.015005

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Abstract

References (14)

Citing Articles (5)

Adish Bindal

K. C. Government Polytechnic for Women, Department of ECE, Ambala City, Harayana, India

Surinder Singh

Sant Longowal Institute of Engineering and Technology, Department of Electronics and Communication Engineering, Longowal, Sangrur, Punjab, India

We investigated Raman gain spectrum and its dependence on Stoke’s shift for fiber Raman amplifiers (FRAs). We determined that the Raman gain spectrum is fairly broad with a gain variation of less than 1 dB from the pump wavelength of 1440 to 1460 nm with maximum gain at 1451.2 nm, which corresponds to a Stoke’s shift of 13.4 THz for the input signal source at 1550 nm. Also, the effect of both a co-propagating and counter-propagating scheme on FRAs was studied without using any booster before the Raman fiber, and it was determined that a small signal gain in the case of the counter-propagating scheme is much higher than that of the co-propagating scheme. The impact of the Raman constant (f_r) on gain saturation is also illustrated. We have demonstrated that at high f_r (>0.18), gain saturation conditions worsen. This suggests that higher saturation input powers can be achieved by selecting an f_r value of 0.18 for small-signal gains of 20 dB and an input power of −20 dBm. We have numerically simulated the gain of a FRA for different Raman fiber lengths using varying pump powers. Gain saturation was observed when the input powers exceeded 5 dBm in an amplifier with a small signal gain of 20 dB, pump power of 1.2 W, and Raman fiber length of 8 km.

History

Received Sep 12, 2011
Accepted Nov 29, 2011
Revised Nov 16, 2011
Published online Feb 07, 2012

Digital Object Identifier

http://dx.doi.org/10.1117/1.OE.51.1.015005

Citation

Adish Bindal and Surinder Singh, "Optimization of fiber Raman amplifier in a gain saturation regime", Opt. Eng. 51, 015005 (Feb 07, 2012); http://dx.doi.org/10.1117/1.OE.51.1.015005