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A distributed-feedback laser (DFB) is a type of laser diode, quantum-cascade laser or optical-fiber laser where the active region of the device contains a periodically structured element or diffraction grating. The structure builds a one-dimensional interference grating (Bragg scattering), and the grating provides optical feedback for the laser.
Photomicrographs of a DBR laser. A distributed Bragg reflector laser (DBR) is a type of single frequency laser diode. Other practical types of single frequency laser diodes include DFB lasers and external cavity diode lasers. A fourth type, the cleaved-coupled-cavity laser has not proven to be commercially viable.
A distributed feedback (DFB) quantum cascade laser [25] is similar to a Fabry–Pérot laser, except for a distributed Bragg reflector (DBR) built on top of the waveguide to prevent it from emitting at other than the desired wavelength. This forces single mode operation of the laser, even at higher operating currents.
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The first in-fiber Bragg grating was demonstrated by Ken Hill in 1978. [2] Initially, the gratings were fabricated using a visible laser propagating along the fiber core. In 1989, Gerald Meltz and colleagues demonstrated the much more flexible transverse holographic inscription technique where the laser illumination came from the side of the fiber.
Finally, their studies were complemented by a crucial experiment in a magnetic field: [8] an unambiguous verification of the emission-mode's matter component in the polaritonic laser regime was given, yielding a first-time experimental demonstration of an electrically pumped polariton laser by C. Schneider, A. Rahimi-Iman and co-authors in the ...
A distributed-feedback laser (DFB) is a type of single-frequency laser diode. [11] DFBs are the most common transmitter type in DWDM systems. To stabilize the lasing wavelength, a diffraction grating is etched close to the p–n junction of the diode. This grating acts like an optical filter, causing a single wavelength to be fed back to the ...
- Grating stabilized (FDB, DBR, ECDL) For biophotonic applications, the most commonly used laser diodes are edge emitting/ridge waveguide diodes, which are single transverse mode and can be optimized to an almost perfect TEM00 beam quality. Due to the small size of the resonator, digital modulation can be very fast (up to 500 MHz).