论文标题
概率形状的4-PAM，用于与峰值限制的短距离IM/DD链接
Probabilistically Shaped 4-PAM for Short-Reach IM/DD Links with a Peak Power Constraint
论文作者
论文摘要
讨论了强度调制和直接检测（IM/DD）链接的概率形状，并引入了由有限调制灭绝比（ER）确定的峰值功率约束。 4- ARY单极脉冲振幅调制（PAM）符号的输入分布已针对无光学扩增或在线分散补偿的短距离传输链路进行了优化。所得的分布是围绕其平均值的对称分布，允许使用概率振幅成型（PAS）生成受正向误差校正（FEC）保护并具有最佳输入分布的符号。对于添加剂白色高斯噪声（AWGN）通道和纤维通道的实验证实，数值分析得到了证实，显示了传输覆盖率和传输速率的提高以及速率适应性。
Probabilistic shaping for intensity modulation and direct detection (IM/DD) links is discussed and a peak power constraint determined by the limited modulation extinction ratio (ER) of optical modulators is introduced. The input distribution of 4-ary unipolar pulse amplitude modulation (PAM) symbols is optimized for short-reach transmission links without optical amplification nor in-line dispersion compensation. The resulting distribution is symmetric around its mean allowing to use probabilistic amplitude shaping (PAS) to generate symbols that are protected by forward error correction (FEC) and that have the optimal input distribution. The numerical analysis is confirmed experimentally for both an additive white Gaussian noise (AWGN) channel and a fiber channel, showing gains in transmission reach and transmission rate, as well as rate adaptability.
