Two 1.3 μm GaInAsP/InP DFB lasers with low threshold currents (28 and 29 mA) were successfully integrated. Both DFB lasers operated continuously at temperatures of up to 68°C. The 12 Å separation in wavelength between the two lasers was produced by a 2 Å difference of the grating periods. A thermal interaction between the two lasers was estimated from the shift in their wavelengths.