Testing and analyzing system for electro-optics characteristics of LDs based on virtual instrumentation

In this paper, a testing and analyzing system for volt-current and optic-power characteristics of semiconductor laser diodes (LDs) based on virtual instrumentation is designed and developed by using PCI-6014 DAQ. The design methods of hardware circuit and software for NI-DAQ are introduced. Some protective methods to LDs, such as driving current limit, avoiding electrical pulse and delay start-up etc. problems, are completely finished by the software, instead of mostly considering the resolvent on hardware circuits. The detailed tested data for the function and performance of the system is presented, and the every tested data of LDs indicates that the whole system is of excellent performance and stability to obtain the parameters of LDs.