# control

## Tuning a DFB laser diode with temperature

Distributed Feedback (DFB) lasers are commonly used as tunable lasers over a range of a few nanometers. This is generally achieved by adjusting the temperature of the chip, thanks to a driver that can also monitor the current flowing through the DFB. This is a straightforward way of obtaining a tunable laser for a narrow range, typically one or two nanometers. However, temperature tuning can lead to unexpected behaviors which can be critical in many applications. A distributed feedback (DFB)…