Method for monitoring the transition temperature and optoelectronic device

An optoelectronic device with integrated monitoring of the transition temperature in the optoelectronic device during its intended use, comprising:

• a plurality of first laser diodes arranged on a carrier substrate;
• a first current source for the electrical supply of the plurality of first laser diodes;
• at least one second laser diode of identical construction to the first laser diodes, which is arranged on the carrier substrate and which is thermally coupled to the plurality of first laser diodes via the carrier substrate;
• a second current source which is configured to apply a current below the laser threshold of the second laser diode to the at least one second laser diode;
• a voltage detector which is configured to detect a voltage drop across the at least one second laser diode;
• and
• a control circuit, which is connected to the first current source and the voltage detector, and which is configured to control the first current source as a function of the voltage drop determined across the at least one second laser diode.