Share Email Print

Optical Engineering

Optimization of fiber Raman amplifier in a gain saturation regime
Author(s): Adish Bindal; Surinder Singh
Format Member Price Non-Member Price
PDF $20.00 $25.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

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 (fr) on gain saturation is also illustrated. We have demonstrated that at high fr (<0.18), gain saturation conditions worsen. This suggests that higher saturation input powers can be achieved by selecting an fr 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.

Paper Details

Date Published: 7 February 2012
PDF: 7 pages
Opt. Eng. 51(1) 015005 doi: 10.1117/1.OE.51.1.015005
Published in: Optical Engineering Volume 51, Issue 1
Show Author Affiliations
Adish Bindal, K. C. Government Polytechnic for Women (India)
Surinder Singh, Sant Longowal Institute of Engineering and Technology (India)

© SPIE. Terms of Use
Back to Top