--- title: "Weiwei Zhang (@aicplight) | Hashnode" description: "Weiwei Zhang (@aicplight) writes on Hashnode. Read their latest articles and follow their work." url: "https://hashnode.com/@aicplight" --- @aicplight # Weiwei Zhang @aicplight · Joined March 2026 ### [400G and 800G Optical Connectivity for NVIDIA DGX B300 RoCE Networks](https://aicplight.hashnode.dev/400g-and-800g-optical-connectivity-for-nvidia-dgx-b300-roce-networks?utm_source=hashnode&utm_medium=feed) An engineering guide to 400G and 800G optical connectivity for NVIDIA DGX B300 RoCE clusters, covering SR4, DR4, MPO fiber assemblies, and dual-plane network cabling. 5 min read · [aicplight.hashnode.dev](https://aicplight.hashnode.dev/400g-and-800g-optical-connectivity-for-nvidia-dgx-b300-roce-networks?utm_source=hashnode&utm_medium=feed) [5h ago](https://hashnode.com/posts/400g-and-800g-optical-connectivity-for-nvidia-dgx-b300-roce-networks/6af575d0eb059e8c85e6db91) ### [NVIDIA DGX B300 InfiniBand Networking: A Practical Guide to XDR and NDR Cabling](https://aicplight.hashnode.dev/nvidia-dgx-b300-infiniband-networking-a-practical-guide-to-xdr-and-ndr-cabling?utm_source=hashnode&utm_medium=feed) Learn how to design XDR and NDR InfiniBand connectivity for DGX B300 AI clusters. 8 min read · [aicplight.hashnode.dev](https://aicplight.hashnode.dev/nvidia-dgx-b300-infiniband-networking-a-practical-guide-to-xdr-and-ndr-cabling?utm_source=hashnode&utm_medium=feed) [1d ago](https://hashnode.com/posts/nvidia-dgx-b300-infiniband-networking-a-practical-guide-to-xdr-and-ndr-cabling/6af3cad28908b15b75cb850d) ### [Troubleshooting High BER in 800G Networks: A Practical Guide to Optical and Electrical Signal Issues](https://aicplight.hashnode.dev/troubleshooting-high-ber-in-800g-networks-a-practical-guide-to-optical-and-electrical-signal-issues?utm_source=hashnode&utm_medium=feed) Learn how to troubleshoot high BER in 800G networks by identifying optical loss, connector contamination, reflections, thermal stress, and electrical signal integrity issues. 10 min read · [aicplight.hashnode.dev](https://aicplight.hashnode.dev/troubleshooting-high-ber-in-800g-networks-a-practical-guide-to-optical-and-electrical-signal-issues?utm_source=hashnode&utm_medium=feed) [6d ago](https://hashnode.com/posts/troubleshooting-high-ber-in-800g-networks-a-practical-guide-to-optical-and-electrical-signal-issues/6aed345411288ff49c1bec01) ### [1.6T Ethernet vs. InfiniBand: A Technical Guide to Next-Generation AI Network Architecture](https://aicplight.hashnode.dev/1-6t-ethernet-vs-infiniband-a-technical-guide-to-next-generation-ai-network-architecture?utm_source=hashnode&utm_medium=feed) Explore 1.6T Ethernet vs. InfiniBand for AI networking. Learn about RoCEv2, RDMA, PFC, ECN, DCQCN, GPU communication, and optical connectivity. 10 min read · [aicplight.hashnode.dev](https://aicplight.hashnode.dev/1-6t-ethernet-vs-infiniband-a-technical-guide-to-next-generation-ai-network-architecture?utm_source=hashnode&utm_medium=feed) [Nov 4](https://hashnode.com/posts/1-6t-ethernet-vs-infiniband-a-technical-guide-to-next-generation-ai-network-architecture/6aeafe0dc22f616c288f1fe5) ### [Inside InfiniBand HDR, NDR, and XDR: Bandwidth, SerDes, and AI Fabric Scaling](https://aicplight.hashnode.dev/inside-infiniband-hdr-ndr-and-xdr-bandwidth-serdes-and-ai-fabric-scaling?utm_source=hashnode&utm_medium=feed) Explore InfiniBand HDR, NDR, and XDR networking, comparing 200G, 400G, and 800G bandwidth, SerDes, RDMA, and AI data center fabric architectures. 5 min read · [aicplight.hashnode.dev](https://aicplight.hashnode.dev/inside-infiniband-hdr-ndr-and-xdr-bandwidth-serdes-and-ai-fabric-scaling?utm_source=hashnode&utm_medium=feed) [Nov 3](https://hashnode.com/posts/inside-infiniband-hdr-ndr-and-xdr-bandwidth-serdes-and-ai-fabric-scaling/6ae9766005bdfb9acfa0b1ed)