tellurite - glass, an optical amplifier and the light source

摘要

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) (301) and a silica-based optical fiber (as a second fiber) (302), optical axes (301a, 302a) of the first and second optical fibers (301, 302) 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 (301, 302).