We have prepared a ridge waveguide distributed feedback (DFB) laser emitting at 1.5 μm. To gain maximum output power of the laser, we choose asymmetric cladding layer structure. By simulation, it is found that while the lower cladding is 450 nm, the laser has minimum inner loose coefficient, and first order mode (m=1) can has minimum limiting factor. The loose coefficient of prepared tube core is 9.78 cm-1, which matches well with the loose coefficient of simulation 9.3 cm-1. Under the direct current of 600 mA, the maximum power of prepared Fabry-Perot (F-P) cavity laser is greater than 114mW. Under the direct current of 225 mA, the prepared DFB laser with single-wavelength has side-mode suppression ratio of 45dB, output power of 40 mW and spectrum line width smaller than 400 kHz.