distributed Bragg reflector (laser) (DBR)

DBR lasers, Distributed Bragg Reflector, are tunable lasers used in optical radio relay(FSO), spectroscopy, high-precision length measurement technology and laser-based displays.

The development of the DBR laser was largely driven by the Ferdinand Braun Institute. DBR lasers consist of different sections such as the gain section, phase section, cavity section, absorber section and DBR section. Different sections are implemented depending on the application. While the amplifier section generates the laser beam, the phase section supports modem-free tuning and modulation of the light signal. The DBR section is based on a Bragg grating that works as a reflector and can be used to select waves.

DBR lasers generate laser beams with wavelengths of 920 nm, 1,060 nm and 1,083 nm, whose wavelengths can be varied by +/- 5 nm. The high spectral purity is about 1 MHz, and the tuning range is 50 GHz. The times of the optical pulses with which the laser beam can be pulsed are between 2 picoseconds (ps) and 100 microseconds (µs). The output powers of DBR lasers are several hundred milliwatts.