The Dfb Laser applications are as following but not limited:

1 Gas detection Sensors:

1. C2H6 Sensing
2. O2 Sensing
3. CH4 Sensing

2 Fiber-optic telecommunications, Dfb Lasers tend to be much more stable than Fabry–Perot FP or DBR lasers. DFB lasers are used frequently when single-mode operation is needed, especially in high-speed fiber-optic telecommunications.