A monolithic integrated chip with DFB lasers in serial is presented, which provides two selectable wavelengths for coarse wave divide multiplexing (CWDM) channel at suitable working condition. Non-uniform multiple quantum wells is designed and grown to widen active material gain spectrum. Weak gain coupled is added into pure refractive index grating of each DFB laser to promote dynamic single mode. The monolithic chip is fabricated with common process of DFB laser, which has the features of simple process, low cost and high repetition. Test results show that the chip can output at two wavelengths of 1.51 μm and 1.53 μm. Output powers are both higher than 6 mW and single mode suppression ratios both achieve 40 dB.