Abstract
An efficient numerical model is proposed to generate cylindrical vector
(CV) beams by use of a few-mode fiber Bragg grating (FM-FBG) written directly
in an ytterbium-doped fiber (YDF). Based on multilayer method, we analysis
the transverse modes competition between LP<sub>01</sub> and LP<sub>11</sub> modes under various conditions.
We propose that a pure CV beam can be generated by completely depressing LP<sub>01</sub> mode
through a doughnut doping few-mode fiber or using a wavelength filter.
© 2012 IEEE
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