| 摘要 |
<p>Disclosed is an article that comprises an optical waveguide mode converter for converting light of wavelength lambda in a few-moded optical waveguide from a given guided mode (e.g., LP01.f) to another guided mode (e.g., LP02.b). The converter comprises a tilted refractive index grating in the core of the waveguide. Appropriate choice of the refractive index profile n(r), photosensitivity p(r) and tilt angle&thetas; makes possible substantial nulling of the coupling between some guided modes (e.g., LP01.f to LP01.b, and LP01.f to LP11.b), and substantial maximization of the coupling between other guided modes (e.g., LP01.f to LP02.b). Mode converters according to the invention can be advantageously used in optical fiber communication systems in add/drop multiplexers. <IMAGE> <IMAGE></p> |
