| 摘要 |
An optical waveguide having a cladding layer formed of high purity glass or a cladding layer formed of high purity isotope proportion modified glass and with a core of high purity isotope proportion modified glass with the index of refraction of the core glass greater than the index of refraction of the cladding glass said high purity isotope proportion modified core material having a Si 29 isotope proportion at most 4.447 % Si 29 (atom/atom) of all silicon atoms in said core or at least 4.90% of Si 29 (atom/atom) atoms in said core or having a Ge 73 isotope proportion of at most 7.2% Ge 73 (atom/atom) of all germanium atoms in said core or at least 8.18% of Ge 73 (atom/atom) of Germanium atoms in said core region. |
