Abstract We propose a novel scheme of 8-ary pulse amplitude modulation (PAM-8) signal generation by a dual-polarization Mach-Zehnder modulator (DP-MZM) driven by binary data with different driving voltages without digital-to-analog converter (DAC). The transmission over 1-km dispersion-shifted fiber (DSF) employing 39.72-GBaud PAM-8 signal is successfully demonstrated in the bandwidth-limited system, satisfying the SD-FEC threshold of 2.7 × 10−2. A low-cost solution to PAM-8 signal generation is proposed, which shows superiority in low power consumption as well as simple system configuration.

中文翻译：

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一种无需 DAC 生成 PAM-8 信号的新方案

摘要 我们提出了一种由具有不同驱动电压的二进制数据驱动的双极化马赫-曾德调制器 (DP-MZM) 产生 8 进制脉冲幅度调制 (PAM-8) 信号的新方案，无需数模转换器。 DAC）。采用 39.72-GBaud PAM-8 信号的 1 公里色散位移光纤 (DSF) 传输在带宽受限系统中得到成功演示，满足 2.7 × 10−2 的 SD-FEC 阈值。提出了一种低成本的PAM-8信号生成解决方案，具有低功耗、系统配置简单等优点。