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Driving circuit examples of laser diodes. May. 21, 2020 Optical module Business Unit Photonics Div. Product Development Dept. 1. Two way of driving LDs; ACC & APC. Graph 1. injection current vs optical output power. Graph 2. optical output power vs monitor current. 0.25.
A laser diode generates some heat at the junction points with a long time of electric current like general semiconductors. As a result, the temperature of the element increases.
It is particularly attractive to use electronic integrated circuits for driving the laser diode. If integrated circuits based on Si are used, a high speed and a sufficiently high current swing may be obtained with emitter-coupled bipolar transistor circuits, allowing for bit rates up to about 2.5 Gbit/s [6, II].
Figure 3 shows a energy band diagram for a simple edge-emitting laser. In the simplest case it's a p-i-n diode (where i is for intrinsic), an it's an improvement on a regular p-n diode, as an energy well is desirable for trapping the carriers so that they have a chance to radiatively recombine.
The block diagram in Figure 1 shows a very basic laser diode driver (or sometimes known as a laser diode power supply). Each symbol is defi ned in Table 1. Laser diode drivers vary widely in feature set and performance.
The latest generation of all-purpose integrated laser driver solutions supports switching frequencies up to 155 MHz and laser currents up to 300 mA. Fig. 1 shows the schematic of an iC-NZN application. It operates from 3.3 to 5.5 V and can drive N, M, and P-type laser diodes with or without monitor diode.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set.
