PAM-6 transmission is considered for short-reach fiber-optic links with intensity modulation and direct detection. Experiments show that probabilistically-shaped PAM-6 and a framed-cross QAM-32 constellation outperform conventional cross QAM-32 under a peak power constraint.

翻译：PAM-6传输被考虑用于短距离光纤连接,与强度调控和直接检测,实验显示,在峰值功率限制下,概率成形的PAM-6和板形的QAM-32星座超过常规的QAM-32。