| 摘要 |
<p>A tunable optical filter has a large diameter cane waveguide (10) with 'side-holes' (18) in the cane cross-section that reduce the force required to compress the large diameter optical waveguide without overly compromising the buckling strength thereof. The large diameter optical waveguide (10) has a cross-section of at least about 0.3 millimeters, including at least one inner core, a Bragg (14) grating arranged therein, a cladding surrounding the inner core, and a structural configuration for providing a reduced bulk modulus of compressibility and maintaining the anti-buckling strength of the large diameter optical waveguide. The structural configuration reduces the cross-sectional area of the large diameter optical waveguide. These side holes reduce the amount of glass that needs to be compressed, but retains the large diameter.</p> |
