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Raman amplification was demonstrated in the early 1970s, but the invention of erbium-doped fiber amplifiers (EDFA) overshadowed the interest in it. Today, Raman scattering has again become a competitive approach for optical amplification because it is only restricted by the pump wavelength and Raman active modes of the gain medium. Pure-silica and germanium-doped silica fibres, currently utilized as Raman gain media in telecommunications, have quite low Raman gain coefficients and a limited usable spectral bandwidth of approx. 5 THz. Therefore, the investigation of materials possessing both large Raman gain coefficients and broader spectral bandwidth than fused silica is becoming necessary to satisfy the increasing telecommunications demands.
Optical Society of America
Publication date: 
14 Jun 2009

L Sirleto, MG Donato, G Messina, S Santangelo, AA Lipovskii, DK Tagantsev, S Pelli, GC Righini

Biblio References: 
Pages: CD_P29
The European Conference on Lasers and Electro-Optics