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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This example shows the basic operation of a wavelength division multiplexer (WDM) with only one channel.
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In 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 (i. It can perform additional roles like providing redundancy, supporting advanced topologies, reducing hardware and cost, etc. This guide gives a top level understanding of Wavelength Division Multiplexing, Coarse Wavelength Division Multiplexing and Dense Wavelength Division Multiplexing.
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This technique enables bidirectional communications over a single strand of fiber (also called wavelength-division duplexing) as well as multiplication of capacity.
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WDM systems are divided into three different wavelength patterns: normal (WDM), coarse (CWDM) and dense (DWDM).
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