Transmission Beyond 200 Gbit/s With IM/DD System for Campus and Intra-Datacenter Network Applications

作者：Md Sabbir-Bin Hossain, Talha Rahman, Nebojša Stojanović, Ricardo Rosales, Tom Wettlin, Stefano Calabrò, Jinlong Wei, Changsong Xie, Stephan Pachnicke · 发表于：IEEE Photonics Technology Letters · 年份：2021 · DOI：10.1109/lpt.2021.3056005 · 被引用次数：26 · 研究领域：Optical Network Technologies、Photonic and Optical Devices、Semiconductor Lasers and Optical Devices

Intensity modulation and direct detection (IM/DD) with pulse amplitude modulation (PAM) is a cost-effective option for intra- and inter-data center (DC) applications. Due to current demand on DC data traffic, transmission rates beyond 200 Gbit/s/λ are desirable. However, employing commercially available lower bandwidth components introduces severe inter-symbol interference (ISI). In addition, to achieving highspeed data rates, digital signal processing (DSP) schemes like Tomlinson-Harashima precoding (THP) and decision feedback equalizer (DFE) can increase tolerance against ISI. In this letter, we show an experimental comparison of PAM-4, PAM-6 and PAM-8 modulation formats with and without THP on the transmitter-side and Volterra nonlinear equalizer (VNLE) on the receiver-side. We provide also results with and without duobinary (DB) encoding on the transmitter side and DFE on the receiver side. The experiment is conducted using an O-band electroabsorption modulated laser over transmission distances up to 20 km.