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Abstract
Mode coupling, bend distortion and bend loss are important considerations in large mode area (LMA) fiber laser. Both mode coupling and mode distortion were studied in the step-index fiber in theory. The dependence of mode power on propagation distance, effective bend radius was calculated with the bend radius changing suddenly and gradually. Taking mode coupling into account, we designed a new cone-shaped coiling device for beam quality improvement. These results and design are of benefit to the applications of coiling fiber to improve beam quality for LMA fiber laser.