Multi-core circle sector peripheral multi-sector core fiber and its production method

Multi-core circle sector peripheral multi-sector core fiber and its production method, which belongs to broadband high-power fiber lasers, fiber specialty fields. To overcome the single multi-rare earth-doped double-clad fiber plasma optical power to withstand a limited, finite block clad fiber core diameter. First to N sectors of rare earth ions doped optical index zone, and the radius of curvature are equal, to form a complete circular core; 3≤N≤9 integer; and evenly distributed around the circular core with the same radius of curvature inner cladding α of the first to M core sectors; N≤M≤32 of integer; π / 2M≤α≤2π / M; first through M core fan apex of the circular outer core is equal to the distance, circular core and the first through the M core sector of rare earth ions doped type sets are equal. The Production Methods: circular core thin rods, thin rod core sector, organized into the optical fiber. The fiber yield, and single-mode fiber splice loss is small; to achieve a large-mode-area single-mode operation.