Get price quotes for Wavelength-Division Multiplexing (WDM). Contact suppliers directly with one click. Two types are available: integrated arrayed waveguide gratings (AWG), offering low cost, compact size, and precise ITU. The Compact CWDM Module (MCWDM, CCWDM, or compact course wavelength division multiplexers) from Lfiber is the perfect means for adding capacity to your fiber optic network without installing additional. Applications: Short to medium reach (up to 80km). Wavelength Division Multiplexing (WDM) is a technique in fiber-optic communication systems that enables multiple optical signals with different wavelengths to be combined, transmitted, and separated over a single optical fiber.