Known hybrid orthogonal frequency division multiplexing-digital filter multiple access (OFDM-DFMA) PONs show promise of seamless and cost-effective convergence of optical and mobile networks for 5G and beyond. This paper reports, for the first time, a new hybrid OFDM-DFMA PON based on intensity modulation and direct detection (IMDD), obtained by modifying digital signal processing (DSP) algorithms embedded in both the OLT and ONUs. The proposed PON allows two spectrally overlapped sub-bands to occupy each individual sub-wavelength spectral region to independently transmit upstream ONU information. A model of the proposed PON is developed and its upstream transmission performances are numerically explored for different application scenarios. Compared with the previously published PON, the proposed PON doubles the number of supported ONUs and provides >1.7-fold aggregate upstream signal transmission capacity increases with <1.5 dB upstream power budget degradations. Alternately, for the same ONU count, >2.2-fold aggregate upstream signal transmission capacity increases and >0.7 dB upstream power budget improvements are achievable. The performance improvements vary by <18% for a transmission distance range as large as 50 km. In addition, the proposed PON is tolerant to finite digital filter tap length-induced channel interferences.

中文翻译：

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利用频谱重叠数字正交滤波的混合 OFDM-数字滤波器多址 PON

已知的混合正交频分复用-数字滤波器多址 (OFDM-DFMA) PON 有望实现 5G 及更高版本的光网络和移动网络的无缝且经济高效的融合。本文首次报道了一种基于强度调制和直接检测 (IMDD) 的新型混合 OFDM-DFMA PON，它通过修改嵌入在 OLT 和 ONU 中的数字信号处理 (DSP) 算法获得。提议的 PON 允许两个频谱重叠的子带占据每个单独的子波长频谱区域，以独立传输上行 ONU 信息。开发了所提出的 PON 模型，并针对不同的应用场景对其上行传输性能进行了数值探索。与之前发布的PON相比，提议的 PON 将支持的 ONU 数量加倍，并提供 >1.7 倍的聚合上行信号传输容量增加，上行功率预算下降 <1.5 dB。或者，对于相同的 ONU 数量，可以实现 >2.2 倍的聚合上行信号传输容量增加和 >0.7 dB 的上行功率预算改进。对于长达 50 公里的传输距离范围，性能改进相差 <18%。此外，所提出的 PON 可以容忍有限数字滤波器抽头长度引起的信道干扰。可以实现 7 dB 上行功率预算改进。对于长达 50 公里的传输距离范围，性能改进相差 <18%。此外，所提出的 PON 可以容忍有限数字滤波器抽头长度引起的信道干扰。可以实现 7 dB 上行功率预算改进。对于长达 50 公里的传输距离范围，性能改进相差 <18%。此外，所提出的 PON 可以容忍有限数字滤波器抽头长度引起的信道干扰。