Investigations on the wavelength dependence of optically induced long-period Bragg gratings

We numerically analyze the conversion of transverse modes with optically induced long-period Bragg gratings. These gratings are generated by a recently developed technique which uses a writing beam guided within the fiber to introduce a transient grating via the optical Kerr effect. We demonstrate several settings for conversion between different transverse modes, including conversion over a broad spectral range of up to 60 nm. The tunability of the grating parameters could promote novel applications.