Practical case- Tunable DFB laser diode - header

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)…

Multimode VCSEL unstability

VCSEL are now used as singlemode and multimode laser sources in many application fields. Many users are not laser expert and may discover VCSEL unstability late in a development …VCSEL Unstability can be related to two mains parameters : drive current and temperature. The following videos can help feeling how sensitive VCSEL unstability can be for a specific application. Here is a video of the spectrum of VCSEL when changing its current from 90 mA to 140 mA. From a…