Abstract
A vector mode conversion approach based on tilted asymmetric fiber Bragg grating (TAFBG) written in vortex fiber is investigated. The mode coupling properties of TAFBG are numerically analyzed. In contrast to step index fiber, the large mode separation in vortex fiber is advantageous to extracting the desired vector mode at specific wavelength. Under the constraint of phase matching, the vector modes could be achieved at separated wavelengths for TAFBG in vortex fiber. The high order vector mode conversion could be realized effectively in two methods by adjusting tilt angle and attenuation coefficient of index change distribution. In addition, the coupling coefficients have an important guiding significance to vector mode conversion. The TAFBG has the advantages of simple structure, multiple flexible operation for vector mode conversion, and it has great potential for optical fiber communication system and fiber lasers with vortex beams output.
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