Amphenol's QSFP-DD Linear Pluggable Optical (LPO) Transceiver delivers low-latency, high-bandwidth PCIe ® Gen 5. 0 over optical link, enabling scalable server disaggregation and efficient rack-to-rack interconnects ideal for AI/ML and rack-scale data center expansion. The wide variety of modules gives you flexible and cost-effective options for all types of interfaces. Cisco offers a range of GBIC, SFP, XFP, SFP+, CXP, CFP, Cisco CPAK, and QSFP+ pluggable modules. NVIDIA's optical modules have emerged as critical components in modern data centers, enabling the high-bandwidth connectivity required for AI training. This article briefly introduces the application scenarios of QSFP-DD in data centers—mid-range transmission. The main focus is on four models: FR4/FR8 (2km) and LR4/LR8 (10km). QSFP-DD. Quad Small Form-factor Pluggable Double Density (QSFP-DD) solution that fits into high-density switch and router client ports for optical interconnect links Powered by Greylock and Delphi DSP ASICs, and silicon photonic integrated circuits (PICs) for an optimized co-packaged design with 3D. GIGALIGHT 200G QSFP-DD PSM8 optical transceiver modules are used for medium to long distance interconnections in data centers and are compliant with 100G PSM4 MSA specification and 200G Ethernet transport protocols, as well as compatible with 8x10G/25G Ethernet and InfiniBand QDR/EDR transport. Amphenol's QSFP-DD Linear Pluggable Optical (LPO) Transceiver delivers low-latency, high-bandwidth PCIe ® Gen 5.