Distributed Bragg reflector laser

[1] The DBR laser structure is fabricated with surface features that define a monolithic, single mode ridge waveguide that runs the entire length of the device.

Within the cavity is a gain ridge portion, where current is injected to produce a single spatial lasing mode.

When operated with a low noise power supply at constant temperature, edge emitting DBR lasers have a linewidth of less than 10 MHz.

Increasing current in the gain region causes a red shift in laser output due to heating.

The blue shift ensures that the wavelength characteristic will repeat itself with increasing temperature or current, and no gaps will occur in the tuning.