Abstract: In order to realize signal modulation through driving optical waveguide switch array operation, a complex multi-channel electrical driving circuit is needed. The main challenge is the complicated voltage calibration process and the imprecision of driving voltage. A control system based on STM32 that could automatically adjust the driving voltage is proposed. It has merits of low cost, real-time detection, fast output control, and high precision of driving voltage, besides it also reduces the complexity of voltage adjustment, and shortens the voltage adjustment time. The system consists of main control module, DAC ( Digital-to-Analog Converter) driver module and optical receiver module. The DAC driver module can drive the optical chip and control the output modulation signal. The functions of optical receiver module include, the adjustable amplified detection, real-time power detection of optical output and the transmission of detected signal to the analog-to-digital converter in the main control module. The main control module can record the output of switch array and adjust the driving voltage accordingly. It consists of the minimum system of single chip microcomputer and the serial screen. The drive control of optical switch is realized through the digital-to-analog converter module, and the feedback of optical switch is received by the optical receiving module. The software provides the function of automatically controlling the voltage within 20 V at an accuracy of 5 mV. The feedbacks from the switch chip are real-time collected to correct the voltage output. The experimental results show that this design works well on the optical switch array driving and has good potentials in optical interconnection, such as the switch array and so on.

Key words: optical switch array; , digital-to-analog converter (DAC) driver module; , optical receiver module; , high precision; , the automatic control