提出并实现了一种基于微环谐振器的2位光学数模转换器, 该器件由2个微环谐振器和2个1×2光学分束器构成, 该结构可以将一个2位电学数字信号转换成一个光学模拟信号。在SOI晶圆上制备出该光学数模转换器, 采用热光效应调制微环谐振器。在输出端口得到光学模拟信号。通过静态光谱测试, 确定微环谐振器的驱动电压和工作波长, 最终展示了50ksamples/s的动态数模转换结果。

In this paper, the architecture of a 2-bit photonic digital-to-analog converter (DAC) based on an integrated optoelectronic circuit consisting of two microring resonators and two 1×2 optical splitters, which can transform a 2-bit electrical digital signal to optical analog signal. As a proof of concept, a 2-bit photonic DAC is fabricated in the silicon-on-insulator (SOI) platform by CMOS-compatible process. Two microring resonators are both modulated through thermo-optic effect by micro-heaters embedded above the ring waveguides. The analog optical output is detected at the output port of the circuit. A 2-bit photonic DAC operating at 50Ksamples/s is demonstrated.