808 nm wavelength 25-stripe laser diode arrays (LDAs) have been fabricated with 200 μm-wide emitters whose center-to-center space is 400 μm. 40 W continuous wave (CW) output power is achieved with Cu-microchannel cooler packaged devices. Step-mirror method is adopted to shape the output beam symmetrically and a square beam pattern is obtained. The focused output beam is coupled into a multi-mode fiber. 30 W output power is obtained from the fiber with core diameter of 600 μm and numerical operture of 0.22, the total coupling efficiency of about 75% is achieved.