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AssigneeNippon Telegraph and Telephone Corporation
InventorsYasutake Ohishi, Atsushi Mori, Makoto Yamada, Hirotaka Ono, Terutoshi Kanamori, Toshiyuki Shimada
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A tellurite glass as a glass material of optical fiber and optical waveguide has a composition of 0<Bi2O3≦20 (mole %), 0≦Na2O≦35 (mole %), 0≦ZnO≦35 (mole %), and 55≦TeO2≦90 (mole %). The tellurite glass allows an optical amplifier and a laser device that have broadband and low-noise characteristics. In a splicing structure of non silica-based optical fiber (as a first fiber) and a silica-based optical fiber (as a second fiber), optical axes of the first and second optical fibers are held at different angles θ1 and θ2 (θ1≠θ2) respectively from a vertical axis of a boundary surface between their spliced ends, and a relationship between the angles θ1 and θ2 satisfies Snell's law represented by an equation of sin θ1/sin θ2=n2/n1 (where n1 is a refractive index of the first optical fiber and n2 is a refractive index of the second optical fiber) at the time of splicing the first and second optical fibers.
An optical fiber splicing structure for contacting a splicing end surface of a first housing in which an end of a first optical fiber is held and a splicing end surface of a second housing in which an end of a second optical fiber is held in a state of co-axial centering on an optical axis of the first optical fiber and an optical axis of the second optical fiber, wherein at least one of the first optical fiber and the second optical fiber is a non-silica-based optical fiber, wherein optical axes of the first and second optical fibers are held in the first and second housings, respectively, at angles θ1 and θ2 (θ1≠θ2) from a vertical axis of a boundary surface between the splicing end surfaces, and a relationship between the angles θ1 and θ2 satisfies Snell's law represented by an equation (4) at the time of splicing the first and second optical fibers:
Dependencies are inferred from the claim text.