The CWDM4 MSA targets a common specification for low cost 100G optical interfaces that run up to 2 km in data center applications. The MSA uses CWDM (Coarse Wavelength Division Multiplexing) technology with 4 lanes of 25 Gb/s optically multiplexed onto and demultiplexed from duplex single mode (SMF) fiber. 

Frequently Asked Questions (FAQ)

  100G CWDM4 MSA Technical Specifications Revision 1.1 (pdf) 

100G 4WDM MSA 10km Technical Specifications Release 1.0 (pdf)

100G CWDM4 MSA Technical Specifications Revision 1.0 (pdf)

ITU-T G.695 CWDM Optical Interfaces Recommendation (pdf) (Table 8-23, pages 49-50, 25G OTL4.4 Applications)

100G CWDM4 MSA Comment Resolution Responses Ver. 11 (xlsx)

CWDM4 Nominal Specifications, Finisar Draft 03 Proposal, 5/9/14 (pdf)

CWDM4 Optical Specifications, Finisar Draft 01 Proposal, 4/14/14 (pdf)


Founding Members


Press Releases and Objectives


All Members >>
New Member Interest Application (pdf)

  September 9, 2014 – CWDM4 MSA Releases Detailed Specification for Low Cost 100G Optical Interfaces Targeting Data Center Applications (pdf)

April, 2014 – MSA Objectives and Specification Status (pdf) (presented at Ethernet Alliance 40G/100G Meeting) 

March 31, 2014 – CWDM4 MSA Group to Support Deployment of 2km 100G Links in Data Centers (pdf)