Cross-talk effect in a laser diode array

A method for compensating for an electric cross-talk, ECT, effect in a laser diode array, wherein the laser diode array comprises a plurality of laser diodes including a first laser diode and a second laser diode;

• comprising:
• determining an ECT prediction signal for predicting an ECT effect on the first laser diode by switching the second laser diode;
• and
• generating, for driving the first laser diode with a desired current profile, a driving signal based on the desired current profile and on the ECT prediction signal.

A writing head for a digital press for transforming a digital image to a physical image on a photoconductor;

• the writing head comprising:
• a plurality of laser diodes including a first laser diode and a second laser diode;
• an image sensor to capture a first image of a first laser spot of the first laser diode with the second laser diode being turned off and capture a second image of a second laser spot of the first laser diode while switching on the second laser diode;
• a writing head controller comprising a processor and a memory, the memory comprises executable instructions that when executed by the processor cause the writing head controller to determine, by image processing of the first image and the second image, a ratio of laser spot energy of the first laser spot and the second laser spot, and calculate, based on the determined ratio of laser spot energy, an electric cross-talk (ECT) coupling coefficient associated with an ECT effect on the first laser diode by switching the second laser diode.