The Coherent dual-laser QSFP28-DCO module is generally available starting March 2026.

The Coherent QSFP28-DCO module is designed for bi-directional 100G coherent transmission over a single fiber, making it ideal for fiber-constrained network environments . This module allows network operators to extend reach up to 300 km and achieve up to a 10x capacity upgrade compared to legacy 10G links, while maintaining compatibility with existing equipment . The compact QSFP28 form factor ensures ease of deployment and operational simplicity. For higher-capacity applications, Coherent also offers 800G QSFP-DD and OSFP coherent optics modules, which support 800G traffic over DWDM links up to 120 km for 800ZR and over 1000 km for 800G ZR+ . These modules are mechanically compliant with QSFP-DD and OSFP standards, providing flexibility for data center interconnects and metro/regional networks. In summary, if you are planning to procure the dual-laser QSFP28-DCO, you can expect availability from March 2026 onward. For larger-scale or higher-speed deployments, the 800G QSFP-DD modules are already available and suitable for long-reach coherent optical networks .