n fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths(colours) of laser light. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity.

Media Converter 10/100/1000 with SFP slot for modules

Media converter 4 10/100/1000Mbps RJ45+2 Giga SFP slots, external power supply