Glass composition for glass substrates containing optical waveguides

A method of making a glass article, comprising:

• forming a waveguide in a glass substrate;
• wherein the glass substrate comprises glass having a composition, in terms of mol % on a representative oxide basis, comprising silica (SiO2), at least 3 mol % soda (Na2O), and no more than 8 mol % rubidium oxide (Rb2O),
• wherein the glass substrate has a silver ion diffusivity of at least 5×10−17 m2/s at a temperature of 350° C.;
• wherein the substrate further comprises a first major surface and a second major surface opposite to the first major surface;
• wherein the waveguide comprises silver disposed in the glass substate between the first major surface and the second major surface, and closer to the first major surface than the second major surface;
• and
• wherein the waveguide comprises a refractive index greater than glass of the glass substrate surrounding the waveguide such that the waveguide exhibits a change in refractive index of at least 0.015 at 1310 nm relative to the glass surrounding the waveguide.

A method of making a glass article, comprising:

• forming a waveguide in a glass substrate;
• wherein the glass substrate comprises glass having a composition, in terms of mol % on a representative oxide basis, comprising:
• silica (SiO2) in an amount in a range from 53 mol % to 84 mol %;
• boria (B2O3) in an amount in a range from 0 mol % to 20 mol %;
• soda (Na2O) in an amount in a range of 3 mol % to 16 mol %;
• potash (K2O) in an amount in a range from 0 mol % to 8 mol %;
• and
• rubidium oxide (Rb2O) in an amount in a range from 0 mol % to 8 mol %;
• wherein the substrate further comprises a first major surface and a second major surface opposite to the first major surface;
• wherein the waveguide comprises silver disposed in the glass substate between the first major surface and the second major surface, and closer to the first major surface than the second major surface;
• wherein the waveguide comprises a refractive index greater than glass of the glass substrate surrounding the waveguide such that the waveguide exhibits a change in refractive index of at least 0.015 at 1310 nm relative to the glass surrounding the waveguide;
• and
• wherein the waveguide has a propagation loss of 0.1 dB/cm or less at 1310 nm.