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19 Aug 2015

In traditional optical fiber networks, information is transmitted through optical fiber by a single lightbeam. In a wavelength division multiplexing (WDM) network, the vast optical bandwidth of a fiber is carved up into wavelength channels, each of which carries a data stream individually. The multiple channels of information (each having a different carrier wavelength) are transmitted simultaneously over a single fiber. The reason why this can be done is that optical beams with different wavelengths propagate without interfering with one another. When the number of wavelength channels is above 20 in a WDM system, it is generally referred to as Dense WDM or DWDM.

What Is DWDM
DWDM, short for dense wavelength division multiplexing, is...

06 Aug 2015

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 of laser light. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity. A WDM system uses a multiplexer at the transmitter to join various signals together, and a demultiplexer at the receiver to split them apart When dealing with optical communication system, there are two main types of WDM systems which are used to transmit the necessary data: CWDM and DWDM.

WDM operating principle

Coarse Wavelength Division Multiplexing (CWDM) is the technology of choice for cost efficiently short-haul...