The laser intensity distribution in the optical fiber is one of the key parts in the research of laser illumination.In this paper

light transmission at the optical beam radius of 15μm

30μm

50μm in single-mode

dual-mode and multi-mode optical fiber in the two-uniform structure are investigated through simulation by optical software OptiBPM.The fiber core diameter size is set at 100μm

120μm

150μm

180μm

respectively.The simulation results show that for the multi-mode of highpower semiconductor laser

the most uniform of light intensity at the exit end of the optical fiber is achieved when the width of the laser beam is equal to fiber core diameter.