| 摘要 |
This invention is predicated upon applicants' discovery that the performance of thermally adjustable fiber grating devices is enhanced by disposing them within a vessel (12) for thermal isolation. The vessel (12) is sufficiently larger than the fiber (10) to avoid contact with the grating yet sufficiently small to isolate the grating from substantial air currents. Conveniently, the vessel is a cylindrical tube having elastomeric end seals (13,14). Advantageously microcapillary tubes (15,16) passing through the elastomeric seals provide openings for the fiber to pass through the tube. <IMAGE> |
