The double-cladding Ytterbium doped fiber of YOEC can output high power laser in 1μm band. Therefore, it is mainly suitable for Ytterbium doped fiber lasers and amplifiers, and widely used in military, industrial, medical and scientific research fields due to its high output beam quality and good stability. By adjusting the fiber parameters, YOEC can provide Ytterbium doped fibers of different sizes and shapes to meet various application requirements.