Analysis of distributed Raman amplification in the S-band over a 100 km fiber span

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Journal of Microwaves and Optoelectronics
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Fiuza J.
Mizutani F.
Martinez M.A.G.
Pontes M.J.
Rocco Giraldi M.T.M.
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The S-band is the next generation transmission window for dense wavelength division multiplexed systems. Distributed Raman amplification in the S band is specially challenging in optical communication systems deploying standard optical fibers. The pump wavelengths are located around the water peak wavelength for Raman amplification in the S-band region. The strong absorption around this wavelength region requires a higher pump power value to attain a given amount of on-off gain. Additionally, the effective noise figure of the distributed Raman amplifiers increases with pump absorption. The feasibility of a 70nm optical bandwidth Raman distributed amplification over 100km is numerically demonstrated using a True Wave Reach Low Water Peak optical fiber in the S-band. The reliability of the analysis lies in experimental Raman gain data, specially measured for S-band operation, used as input parameter in the numerical simulations. Additionally, the separation of the different processes to spectral gain shape in the analysis, such as pump-signal and pump-pump interactions, allows a straightforward determination of pump wavelengths and powers levels to cover the entire S band with minimum gain ripple. The analysis indicates the feasibility of a 15dB on/off gain with a gain ripple smaller than 2dB over 100km fiber span throughout the S band with the use of four pump lasers with power levels ranging from tenths to hundreds of miliwatts. © 2007 SBMO.
Assuntos Scopus
Distributed Raman amplification , Low water peak fibers , Next generation transmission window