TELLURITE GLASS, OPTICAL AMPLIFIER, AND 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) and a silica-based optical fiber (as a second fiber), optical axes of the first and second optical fibers are held at different angles ~ and ~2 (~1 ~ ~2) respectively from a vertical axis of a boundary surface between their spliced ends, and a relationship between the angles ~1 and ~2 satisfies Snell's law represented by an equation of sin ~1/ sin ~2 ~ 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.