| 摘要 |
<p>A material such as an optical fibre is subjected to hydrogen loading. Substantially all the unreacted hydrogen is then allowed to diffuse out of the material. This procedure enhances the photosensitivity of the material, and the hydrogen loading is performed at a temperature and duration which avoids formation of hydroxyl species in the material (eg, 80 degrees Celsius for 14 days for a phosphosilicate fibre). An optical structure such as a Bragg grating (14) may subsequently be written in the material, via UV irradiation.</p> |
