Opt Lett. 2023 Feb 15;48(4):1036-1039. doi: 10.1364/OL.479046.
We propose and demonstrate a high-efficiency silicon microring modulator for next-generation optical transmitters operating at line rates above 300 Gb/s. The modulator supports high-order PAM-8 modulation up to 110 Gbaud (330 Gb/s), with a driving voltage of 1.8 V. The small driving voltage and device capacitance yields a dynamic energy consumption of 3.1 fJ/bit. Using the modulator, we compare PAM-8 with ultrahigh baud rate PAM-4 of up to 130 Gbaud (260 Gb/s) and show PAM-8 is better suited for 300-Gb/s lane rate operation in bandwidth-constrained short-reach systems.
我们提出并演示了一种用于下一代光发射器的高效硅微环调制器，其工作速率超过 300Gb/s。该调制器支持高达 110Gbaud（330Gb/s）的高阶 PAM-8 调制，驱动电压为 1.8V。小的驱动电压和器件电容使得动态能耗为 3.1fJ/bit。使用该调制器，我们比较了高达 130Gbaud（260Gb/s）的超高速 PAM-4 和 PAM-8，并表明 PAM-8 更适合带宽受限的短距离系统中的 300-Gb/s 通道速率操作。
