With the rapid development of cloud computing, big data, artificial intelligence, Internet of Things, live streaming and other technologies, infrastructure projects with 5G and cloud data center as the core are becoming more and more important. The construction of 5G network with low delay, high speed and flexibility, and the rapid growth of DCI demand brought by DC-centered, It has become the focus and research hotspot of the whole optical communication industry.
For the internal optical network of data centers in the cloud, data centers have become the first driving force for the development of the optical module market and technological progress. At present, 400Gbit/s optical modules have become popular, and 800Gbit/s optical modules have also begun to appear. The future development trend is that telecommunication equipment optical module learn from and reuse data center optical module technology; Optical communication on board is the next development hotspot of optical network in data center, which has attracted great attention in the whole industry. Therefore, in the fourth chapter, 15 core innovative R&D technology directions are studied in detail, including: 50G/100G Baud, IM-DD PAM-4, CDR/DSP, Digital coherence, Nyqusit WDM/ subcarrier Super channel, Super 100G Serdes I/O interface specification design, 100G/400G/800G/1.6T evolution, 400G silicon optical module integration scheme design, DCN core technology of data center network (layer 2 EVLAN, orthogonal zero backplane switching mechanism fabric, Leaf-Spine) DCN networking), new high-integration 400G port high-throughput box switch, all-optical backplane bus interconnection technology, silicon optical advanced integration and advanced packaging technology, open/decoupled white box switch technology based on silicon optical +ASIC CPO photoelectric sealing technology. This chapter is the most comprehensive summary of the cutting-edge technologies of 400G optical modules and white box 52Tbps Ethernet switches.
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