The 4WDM MSA is an industry consortium dedicated to defining optical specifications and promoting adoption of interoperable 100G (4x25G) optical transceivers for 10 km based on the CWDM4 wavelength grid, and for 20 km and 40 km based on the LAN-WDM wavelength grid, over duplex single-mode fiber (SMF). These extended reaches are important for modern datacenter interconnects and mobile backhaul applications. The 4WDM MSA participants are responding to previously unmet industry needs for longer reaches, lower costs, and lower power consumption, as compared to previously available standards, in small form factors.

Sept. 18, 2017 — The 4WDM MSA Group Releases 20 km and 40 km Specifications for Cost-Effective and Low-Power 100G Optical Networks (pdf)
March 20, 2017 — 100G CWDM 10km Specification Published (pdf)
Sept. 19, 2016 — New 4WDM MSA Group Driving Development of 10, 20, and 40 km Low Cost 100G Optical Specifications Targeting Modern Data Centers (pdf)

100G 4WDM-20 20km & 4WDM-40 40km Technical Specifications Release 1.0 (pdf)
100G 4WDM-10 10km Technical Specifications Release 1.0 (pdf)
100G CWDM4 MSA 2km Technical Specifications Revision 1.1 (pdf)

10, 20, 40km Spec. Proposal, Draft 04, 10/18/16 (pdf)
10, 20, 40km Spec. Proposal, Draft 01, 7/12/16 (pdf)