| 摘要 |
An optical device comprises a substrate having at least one light-guiding core; a core-modifying element disposed at least partly within the light-guiding core, the core-modifying element being formed of a material different to the substrate material so that the refractive index difference between the material of the core-modifying element and the light-guiding core is dependent upon the temperature of the core-modifying element; and a heating and/or cooling arrangement for altering the temperature of the core-modifying element. |
