Standardization activities are nearly complete for single wavelength 25 Gb/s time-division multiplexed (TDM) passive optical networks (PONs) and well underway for 50 Gb/s TDM PONs. There is considerable debate in the industry about which technology will be the “next step” after 10 Gb/s TDM PON, now finally starting to ramp up to mass deployment. 50 Gb/s PON clearly brings a ${2} \times$2× bandwidth advantage over 25 Gb/s, at least in the downstream direction. On the other hand, the increase of speed to 50 Gb/s brings with it a substantial receiver sensitivity penalty of at least 4 dB, which has a chain effect on transceiver architecture, cost, and time-to-market. In this paper, each of those elements is investigated, quantified, and compared to 25 Gb/s.

中文翻译：

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从25 Gb / s到50 Gb / s的TDM PON：收发器架构，其性能，标准化方面以及成本建模

对于单波长25 Gb / s时分多路复用（TDM）无源光网络（PON）的标准化活动已接近完成，而对于50 Gb / s TDM PON的标准化活动正在进行中。在10 Gb / s TDM PON之后，哪种技术将是“下一步”，现在业界终于开始逐步进行大规模部署，这在行业中存在着很大的争论。50 Gb / s PON至少在下行方向显然比25 Gb / s带来$ 2乘以2倍的带宽优势。另一方面，速度提高到50 Gb / s带来了至少4 dB的显着接收器灵敏度损失，这对收发器架构，成本和上市时间产生了连锁影响。在本文中，对每个元素进行了研究，量化，并将其与25 Gb / s进行了比较。