We propose a novel probabilistically shaped amplitude and pulse position modulation (APPM) based on stepped amplitude probability distribution for optical access networks. By adopting the probabilistic shaping (PS) technique, average signal power can be reduced and better bit error rate (BER) performance obtained. The proposed PS‐APPM scheme has been successfully verified in a 25‐km standard single‐mode fiber (SSMF). Experiment results show that at a BER of 1 × 10⁻³, the proposed 4 × 16 APPM‐PS1 and 4 × 16 APPM‐PS2 outperform the traditional 4 × 16 APPM by 1.54 and 2.52 dB receiver sensitivity improvement, while the proposed 8 × 8 APPM‐PS1 and 8 × 8 APPM‐PS2 excel the traditional 8 × 8 APPM by 2.1 and 3.5 dB at a BER of 1 × 10⁻², suggesting the advanced nature of the proposed scheme for future optical access networks.

中文翻译：

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基于逐步幅度概率分布的光接入网概率形状幅度和脉冲位置调制

我们提出了一种新的概率形状的幅度和脉冲位置调制（APPM），基于光接入网的逐步幅度概率分布。通过采用概率整形（PS）技术，可以降低平均信号功率，并获得更好的误码率（BER）性能。提议的PS-APPM方案已在25公里标准单模光纤（SSMF）中成功验证。实验结果表明，在BER为1×10 ^-3时，建议的4×16 APPM‐PS1和4×16 APPM‐PS2在性能上比传统的4×16 APPM高1.54和2.52 dB接收器灵敏度，而建议的8× 8 APPM‐PS1和8×8 APPM‐PS2在BER为1×10 ^−2时优于传统的8×8 APPM分别为2.1和3.5 dB，表明了该方案对于未来的光接入网的先进性。