| 摘要 |
<p>An optical fibre (2) is fixed against a first face (4) of a prism (5). A coherent beam of optical radiation (7) is directed at the prism (5) such that a portion B propagates directly to the first face (4) while a second portion (A) propagates via total internal reflection at a second face (8). The interference of the two portions creates a refractive index grating in the fibre (2) at a wavelength longer than that of the radiation (7). The method provides a stable and simple method of sidewriting of waveguide gratings.</p> |
