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High concentration yb3+-doped double-clad microstructure fiber with large mode area is considered as the most popular gain medium for the high power optical fiber laser.Nowadays,the conventional fabrication method of yb3+-doped microstructure fiber is the modified chemical vapor deposition and solution doping techniques.However,the method has some defectives,such as low doping concentration,high fluctuation of refractive index distribution and difficulty in fabricating large core.