Optical fiber for raman amplification

Details Optical fiber for raman amplification Optical fiber for raman amplification

H - Electricity

01

S

H01S 3/30 (2006.01) C03C 3/12 (2006.01) C03C 4/00 (2006.01) C03C 13/04 (2006.01) H01S 3/17 (2006.01) H01S 3/067 (2006.01)

Patent

CA 2493689

Raman amplifier comprising an optical fiber (2) which comprises a tellurite glass. The tellurite glass comprises at least two further metal oxides, the metals of said respective two oxides being selected from a first group consisting of Nb, W, Ti, Tl, Ta, and Mo and from a second group Nb, W, Ti, Pb, Sb, In, Bi, Tl, Ta, Mo, Zr, Hf, Cd, Gd, La, Ba. The so obtained fiber (2) have improved optical (Raman gain) and/or thermal (thermal stability index) properties. Alternatively, the tellurite based glass compositions of the fiber comprises at least one additional metal oxide, where the metal is selected among Nb, Ti, Tl, Ta, and Mo, said glass showing a particularly high Raman gain. The maximum Raman gain of these glasses is typically higher than 100 times of the maximum Raman gain of pure silica and the respective total cross- section of the Raman spectrum is typically greater than 100 times than the total cross-section of pure silica, in the frequency measurement range of from 200 cm-1 to 1080 cm-1.

La présente invention concerne un amplificateur Raman comprenant une fibre optique (2) en verre de tellurite. Ce verre de tellurite comprend au moins 2 autres oxydes de métaux choisis, l'un dans un 1?er¿ groupe constitué de Nb, W, Ti, Tl, Ta et Mo, l'autre dans un 2?ème¿ groupe constitué de Nb, W, Ti, Pb, Sb, In, Bi, Tl, Ta, Mo, Zr, Hf, Cd, Gd, La et Ba. La fibre ainsi obtenue (2) présente de meilleures propriétés optiques (gain Raman) et/ou thermique (indice de stabilité thermique). Selon un autre mode de réalisation les compositions du verre au tellurite de la fibre comprennent également au moins un oxyde de métal supplémentaire, choisi dans le groupe des Nb, Ti, Tl, Ta et Mo, le verre se distinguant alors par un gain Raman particulièrement élevé. En l'occurrence, le gain Raman maximum de ces verres est généralement supérieur de plus de 100 fois au gain Raman de la silice pure et la largeur totale du spectre Raman est généralement supérieure de plus de 100 fois à celle de la silice pure, pour des plages de mesures de 200 cm?-1¿ à 1080 cm?-1¿.

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