Dense wavelength-division multiplexing (DWDM) refers originally to optical signals multiplexed within the 1550 nm band so as to leverage the capabilities (and cost) of EDFAs, which are effective for wavelengths between approximately 1525–1565 nm (), or 1570–1610 nm ().
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Dense Wavelength Division Multiplexing (DWDM) is an advanced fiber-optic transmission technology that enables the simultaneous transport of multiple data streams over a single optical fiber. Each data stream is carried on a unique wavelength (or channel), dramatically increasing fiber capacity. The DWDM optical module is designed specifically for single-mode optical fiber (long-distance transmission) and operates between 1528.
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