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            The technology CWDM (Coarse Wavelength-Division Multiplexing - WDM GDP) was first used in the early '80s for digital video signal transmission through multimode fiber. Originally Quante Corporation has released a CWDM system partitioned to 800Nm, on four channels that could carry the 140Mb / s each; at first, these systems have been used for cable television. Although it was an advanced solution for dividing and multiplexing of signals by dividing the frequency ranges of wavelengths CWDM system has not produced a significant interest to operators of communications - until now.

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Module optice CWDM

          

              Meanwhile, CWDM technology has evolved and it was the standardization of wavelengths, in accordance with complementary optical devices (optical fiber SFP modules / GBIC, switches). So, CWDM solution is increasingly becoming an important architecture for data transport.

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              CWDM solution uses special lasers that do not require refrigeration - "un cooled lasers - polarized DFB (Distributed-feedback) and optical filters for high bandwidth. Some advantages of this technology are: minimal loss of optical power over long distances, small size and especially the capacity to reduce the cost of additional networking through existing fiber branching. The ability to add between 2 and 8 wavelengths per fiber allows designers to increase without installing more expensive systems, such as DWDM.

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         DWDM Systems (Dense Wavelength-Division Multiplexing - WDM branched) superior in terms of complexity compared to CWDM (whether through a CWDM 8 frequencies can carry up to 8G, instead through a DWDM with the same number of frequency standard can carry 100G - more dense partitioning due to separations of 1.6, 0.8 or 0.4nm). However, commercial availability in CWDM systems is more affordable, offering the benefit of standard wavelengths, making them an excellent alternative for applications in communication networks and protocols for access or metropolitan areas

 

 

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