Discover 196 Wavelength Division Multiplexers (WDM) manufacturers and distributors on GlobalSpec. Find products, technical articles, videos, and more. Also available are single fiber 40 channel DWDM C+L athermalized arrayed waveguide multiplexers, DWDM multiplexers and 16 channel CWDM multiplexers. PPC DWDM multiplexers offer a 40 channel configuration (100GHz spacing) and an 80 channel configuration (50GHz spacing) option. Unlike the similar FiberPlex products in the WDM series, this unit is passive and all connected fiber optic modules must be externally selected to specific wavelengths. PM fiber components; patch cords, splitters/combiners, polarizers, isolators, fused/PLCS couplers, test equipment; PER meter, polarized sources, PDL.