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Nonlinear Performances of Photoinduced Fiber Grating Mode Converter and Their Application

The optical Kerr effect involved in a fiber grating type LP 01 ↔ LP 02 mode converter is investigated by using the coupled-mode theory. Tunable characteristics of the conversion efficiency is shown when the input peak power is varied, which exhibits an optical switching property. The switching power can be reduced by using a weak index perturbation of the fiber grating or using a fiber with large core-cladding refractive-index difference and a small fiber core radius. In additions, a preliminary schematic structure of a novel passive mode-locked fiber laser using a nonlinear mode converter is proposed for the application.