The design, function and purpose also differ in terms of transmission length and distance. CWDM systems, however, are also less expensive from the outset. CWDM systems are older and cannot fit as many data streams. There are several differences between DWDM and CWDM systems. Optical networking and especially the use of DWDM technology has proven to be the optimal way of combining cost efficient transport with advanced functionality, which can cope with the bandwidth explosion from the access network.
DWDM is a technology allowing high throughput capacity over longer distances commonly ranging between 44-88 channels/wavelengths and transferring data rates from 100Mbps up to 100Gbps per wavelength.
Optical networking and especially the use of CWDM technology has proven to be the most cost efficient way of addressing this requirement. At present there are two types of WDM architecture: Coarse Wavelength Division Multiplexing (CWDM) and Dense Wavelength Division Multiplexing (DWDM).ĬWDM is the technology of choice for cost efficiently transporting large amounts of data traffic in telecoms or enterprise networks. This technique enables bidirectional communications over one strand of fiber, as well as multiplication of capacity. WDM architecture is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths of laser light. WDM is now a cost-effective, flexible and scalable technology for increasing capacity of a fiber network.
Since the physical fiber optic cabling is expensive to implement for each and every service separately, the capacity expansion using a Wavelength Division Multiplexing (WDM) is a necessity. Throughout the last 30 years, optical systems have increased their capacity regularly, allowing for bandwidth upgrades that outpaced the growth in bandwidth demands. Background of Wavelength Division Multiplexing (WDM)
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