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AssigneeNippon Telegraph and Telephone Corporation
InventorsYasutake Ohishi, Terutoshi Kanamori, Yoshiki Nishida, Atsushi Mori, Shoichi Sudo
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Fluoride glass-based optical fiber for an optical amplifier which contains rare earth metal ions in the core glass has a relative refractive index difference .DELTA..sub.n between the core and the cladding of 1.4% or more. The core glass contains PbF.sub.2 in a proportion of 25 mol % or less based on the total composition of the core glass . The fluoride glass is doped with rare earth metal ions, and part of the fluorine in the glass may be substituted by at least one halogen. Pr.sup.3+, Pr.sup.3+ --Yb.sup.3+, Pr.sup.3+ --Nd.sup.3+, or Pr.sup.3+ --Er.sup.3+ can be doped as the rare earth metal ions. Chlorine, bromine or iodine may be used as the halogen.
A fluoride glass optical fiber for an optical amplifier having a core and a cladding, and containing rare earth metal ions in a core glass, wherein the relative refractive index difference (.DELTA..sub.n) between the core and the cladding is at least 1.4%, and the core glass contains PbF.sub.2 in a proportion which is not greater than 25 mol % based on the total composition of the core glass.
A fluoride glass optical fiber for an optical amplifier, having a core and a cladding and containing rare earth metal ions in a core glass,
A fluoride glass optical fiber, for an optical amplifier having a core and a cladding and containing rare earth metal ions in a core glass,
A fluoride glass optical fiber for an optical amplifier, having a core and a cladding and containing rare earth metal ions in a core glass,
Dependencies are inferred from the claim text.