Distributed feedback laser



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A distributed feedback laser (DFB) is a type of Bragg scattering from the structure.

Since the grating provides feedback, DFB lasers do not use discrete mirrors to form the laser designs). The grating is constructed so as to reflect only a narrow band of wavelengths, and thus produce a narrow linewidth of laser output.

Altering the K change in temperature. Altering of the modulation rate of the current powering the laser will also tune the device.

DFB lasers are often used in optical communication applications such as DWDM where a tunable laser signal is desired.

 
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