Raman gain properties of optical fibers with a high Ge-doped silica core and standard optical fibers

Raman gain characteristics are measured for single-mode optical fibers with a high content of germanium and for commercially available optical fibers with shifted dispersion and a large effective core area. Optical fibers of these types were studied as active media for Raman fiber amplifiers at the wavelengths of 1.5 and 1.3 mum. The maximum Raman gain was achieved for a f iber with a high content of germanium and was equal to 23.3 dB/(km W). 1.40 7- and 1.229 mum Raman lasers based on phosphosilicate fibers were employed as pump sources for Raman amplifiers.