Sky Optics 400G QSFP-DD LR4 is a long-reach single-mode optical transceiver compliant with 400GBASE-LR4 standard, adopting mature CWDM4 four-wavelength solution of 1271/1291/1311/1331nm. Equipped with high-power EML laser array and PAM4 modulation technology, it stably transmits 425Gbps full-duplex signals up to 10km over G.652 standard single-mode fiber via duplex LC-UPC interface.

Optimized optical power budget design ensures sufficient link margin for long-distance transmission. The module adopts QSFP-DD hot-pluggable packaging, with power consumption controlled within 8W, and supports stable operation in 0℃-70℃ commercial temperature range. It supports full I²C DDM real-time monitoring and CMIS4.0 protocol, with excellent compatibility and fault tolerance, passing multiple strict reliability tests.

As the mainstream 10km long-distance 400G networking solution, LR4 makes up for the distance shortage of FR4 modules. It is widely used for cross-building interconnection of large parks, urban small-span MAN connection, remote data center uplink and enterprise long-distance network convergence, serving as the core module for 400G long-distance wired transmission.