Major Difference Between DFB Laser And DBR Laser https://www.inphenix.com/en/dfb-laser-vs-dbr-laser/ A DFB laser is a type of diode laser that generates resonance and oscillation in the cavity using diffraction gratings rather than mirrors. The laser’s purpose is to sharpen the output of conventional Fabry-Perot lasers. #DBRlasers are among the earliest, if not the first, single frequency lasers ever built. These are tunable single mode diode lasers with a resonator made of a short piece of active fiber sandwiched between two Fiber Bragg Gratings. In comparison to the #DFBlaser, the DBR laser generates single frequency, phase coherent photons at a specific wavelength.