Editing Gigabit Ethernet (section)

===1000BASE‑DWDM===
1000BASE-DWDM is a non-standard but industry accepted term<ref name="Cisco-DWDM-SFP" /><ref name="FS-DWDM-info" /> to refer to Gigabit Ethernet transmission. It is very similar to 1000BASE-LX10 but achieves longer distances up 40–120&nbsp;km, and up to 64 to 160 parallel channels over a pair of single-mode fibers due to higher quality optics than LX10 and use of DWDM, running on 1528-1565&nbsp;nm wavelength lasers.

The most used channels are  CH17-61 on Wavelength 1528.77-1563-86&nbsp;nm.

To use DWDM it is necessary to use a Mux/Demux unit on both ends of the fiber link, a DWDM MUX/DEMUX with corresponding wavelengths, and SFP with corresponding wavelengths.<ref name="FS-DWDM-info" /> is it also possible to use CWDM in series to increase the number of channels.{{cn|date=January 2021}}