Our 100G BiDi QSFP28 ER1 40km Side A transceiver enables fiber-efficient ultra-extended connectivity using single-lambda PAM4 technology. Supporting 40km with FEC over single-mode fiber at 1304. The FS® 100GBASE Quad Small Form-Factor Pluggable (QSFP28) portfolio offers customers a wide variety of high-density and low-power 100 Gigabit Ethernet connectivity options for data center, high-performance computing networks, enterprise core and distribution layers, and service provider. NEC's 100G QSFP28 BiDi optical transceiver enables the transmission and reception of 100Gb/s high-speed data over a single optical fiber. Designed for service providers, data center operators, and access networks, our Bidi. At the center of this transition is QSFP28, a compact, high-performance optical transceiver form factor designed specifically for 100-gigabit data rates. QSFP28 (Quad Small Form-Factor Pluggable 28) enables 100G transmission by aggregating four parallel 25G electrical lanes, delivering an optimal. This guide provides the definitive roadmap for selecting, deploying, and troubleshooting QSFP28 transceivers while bypassing the painful trial-and-error phase. This article briefly introduces the key features and core advantages of 100G BiDi.