| 摘要 |
<p>In a glass optical waveguide having a core containing at least one oxide selected from the group of glass-constituting oxides consisting of Bi 2 O 3 , Sb 2 O 3 , PbO, SnO 2 and TeO 2 , large transmission loss of light which occurs when the cross-sectional shape of the core is rectangle, is reduced. A glass optical waveguide which contains at least total 35% in mass% of at least one type of the above glass-constituting oxides, wherein the cross-sectional shape of the core is trapezoidal, among two parallel sides of the trapezoid, a long side is in a substrate side and among four sides constituting the trapezoid, angles of two oblique sides to the long side are each within a range of from 60 to 80°.</p> |
