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Distributed Feedback Laser

An injection laser diode built with a Bragg reflection grating in the active region in order to avoid multiple longitudinal modes and enhance a single longitudinal mode.

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

It produces a finer range of wavelengths than a Fabry-Perot laser, which emits a lot of harmonics between 5 and 8 nm and cannot be used in WDM systems.