Optical digital-to-analog converters (DACs) are key to overcoming the enormous power consumption caused by the slowdown of Moore's Law. In previous work, an optical DAC consisting of a signal generator and an intensity converter was presented. The generating component was integrated into the device, but a higher level of device integration is desirable. An optical DAC device with a built-in intensity converter for a 2-bit binary phase-shift keying (BPSK) signal is demonstrated. The integrated device consists of two delay line interferometers (DLIs) with silicon waveguides. The first is used to generate a quadrature PSK (QPSK) signal from two BPSK signals, and the second is used to convert the QPSK constellation into light intensities. Experimental results show that the 2-bit digital codes 00, 01, 10, and 11 can be successfully converted into four different light intensities depending on their pattern at 10 Gbps.

中文翻译：

---

一种内置硅波导强度转换器的光学数模转换器

光学数模转换器 (DAC) 是克服摩尔定律放缓造成的巨大功耗的关键。在之前的工作中，提出了一种由信号发生器和强度转换器组成的光学 DAC。发电组件已集成到设备中，但需要更高级别的设备集成。演示了一种带有内置强度转换器的光学 DAC 器件，用于 2 位二进制相移键控 (BPSK) 信号。该集成器件由两个带有硅波导的延迟线干涉仪 (DLI) 组成。第一个用于从两个 BPSK 信号生成正交 PSK (QPSK) 信号，第二个用于将 QPSK 星座转换为光强度。实验结果表明，2 位数字代码 00、01、10 和 11 可以根据其模式在 10 Gbps 下成功转换为四种不同的光强度。