Net-432-Gb/s/λ PS-PAM transmission based on advanced DSP and single DAC for 400 G/λ IM/DD links

• DOI: 10.1364/ol.517152
• Publication Date: 2024-02-20T14:00:13Z
• Authors: An Yan; Guoqiang Li; Sizhe Xing; Wangwei Shen; Yongzhu Hu; Aolong Sun; Jianyang Shi; Ziwei Li; Chao Shen; Nan Chi; Junwen Zhang
• Keywords: Symbol rate; Modulation (music)

The escalating surge in datacenter traffic creates a pressing demand for augmenting the capacity of cost-effective intensity modulation and direct detection (IM/DD) systems. In this Letter, we report demonstration single-lane 128-GBaud probabilistically shaped (PS)-PAM-20 IM/DD transmission using only single digital-to-analog converter (DAC) net 400 G/λ system. Based on advanced digital signal processing (DSP), achieve bitrates up to 437 Gb/s optical back-to-back 432 after 0.5-km SSMF C-band with 128-Gbaud PS-PAM-20 signals. This work is latest ultra-high-order PS-PAM signals achieving exceeding despite symbol rate limitations. Notably, best our knowledge, realized information ([net bitrate]/[symbol rate]) 3.37 marks new achievement within domain systems, promising implications enhancing bandwidth efficiency upcoming 1.6-Tb Ethernet scenario.