聚合物光波导开关阵列的驱动系统设计

Design of Driving System for Polymer Optical Waveguide Switch Array

为驱动光波导开关阵列实现信号的调制,需要对较多数量光路进行电驱动。针对驱动电路电压调校过程繁琐,驱动电压精度不高等问题,设计了一种基于STM32的自动调校驱动电压的控制系统,其主要包括主控模块,驱动模块和光接收模块。驱动模块对光芯片进行驱动,并可控制其输出调制信号;光接收模块能实现可调放大探测功能,实时探测光芯片输出光功率,并传送给主控模块中的模数转换器;主控模块接收记录芯片的输出状态,并自动调节遍历驱动电压。系统硬件部分以单片机最小系统及串口屏为主控单元,通过数模转换器模块实现光开关的驱动控制,利用光接收模块接收光开关反馈;软件部分以5 mV的精度对20 V以内的电压进行自动控制,并实时采集光芯片的反馈以对校正电压记录。利用该系统对光开关芯片的测量实验结果表明,该设计可通过校正电压对光开关进行有效驱动,降低了成本,实现对输出信号实时检测与控制,缩短了电压调校时间,有效提高了光开关阵列驱动电压精确度,在片上光互联的开关阵列等方向具有良好的应用前景。

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.