13 Facts About Dense WDM

Term Dense WDM is commonly applied to an optical carrier, which is typically described by its wavelength, whereas frequency-division multiplexing typically applies to a radio carrier which is more often described by frequency.

Dense WDM system uses a multiplexer at the transmitter to join the several signals together and a demultiplexer at the receiver to split them apart.

Dense WDM systems are popular with telecommunications companies because they allow them to expand the capacity of the network without laying more fiber.

Certain forms of Dense WDM can be used in multi-mode fiber cables which have core diameters of 50 or 62.

Coarse Dense WDM provides up to 16 channels across multiple transmission windows of silica fibers.

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Dense WDM uses the C-Band transmission window but with denser channel spacing.

Coarse wavelength division multiplexing, in contrast to DDense WDM, uses increased channel spacing to allow less-sophisticated and thus cheaper transceiver designs.

Main characteristic of the recent ITU CDense WDM standard is that the signals are not spaced appropriately for amplification by EDFAs.

CDense WDM is being used in cable television networks, where different wavelengths are used for the downstream and upstream signals.

GBIC and SFP CDense WDM optics allow a legacy switch system to be "converted" to enable wavelength multiplexed transport over a fiber by selecting compatible transceiver wavelengths for use with an inexpensive passive optical multiplexing device.

Passive CDense WDM is an implementation of CDense WDM that uses no electrical power.

The first commercial deployment of DDense WDM was made by Ciena Corporation on the Sprint network in June 1996.

DDense WDM systems have to maintain more stable wavelength or frequency than those needed for CDense WDM because of the closer spacing of the wavelengths.