The CWDM8 Multi-Source Agreement group released a new technical specification for 400 Gb/s optical links up to 10 km over duplex single-mode fiber (SMF).

The new specification, which is available at the organization’s website, represents the industry’s first 400G 10 km interface specifically targeted for implementation in next-generation optical module form factors such as QSFP-DD or OSFP for high-density data center networking equipment.
The new 10 km reach specification joins the 2 km reach 400G specification that the MSA Group released in November 2017. These 400G CWDM8 optical interfaces were developed to support a wide range of high-bandwidth networking applications in data center, campus, enterprise, and metropolitan area networks.