Multiple light waves with a low loss window reuse, as opposed to the light waves of different low-loss window Coarse Wavelength Division Multiplexing Multiplexing.
DWDM: Dense Wavelength Division Multiplexing is a combination of a set of light wavelengths using an optical fiber transmission. This is the one used in the existing fiber optic backbone network bandwidth laser technology. More specifically, the technology is close spectral spacing in a specified fiber, multiplexing, a single optical carrier, in order to take advantage of the transmission performance can be achieved (for example, the minimum degree of dispersion or attenuation). In this way, given the information transmission capacity, it can reduce the total number of fiber needed.
In the same fiber, DWDM can have different wavelengths simultaneously mix and transfer. In order to ensure effective, an optical fiber into multiple virtual fiber. So, if you intend to reuse the eight optical carrier (OC), that is, a signal of the optical fibers 48 so that transmission capacity from 2.5Gb / s to 20Gb / s. At present, the use of DWDM technology, a single optical fiber can transmit data traffic to achieve 400Gb / s. With the manufacturers in each fiber by adding more channels, the terabit per second transmission speed is just around the corner.
A key advantage of DWDM is protocol and transmission speed is not relevant. Based on the DWDM network can use the IP protocol, ATM, SONET / SDH, Ethernet protocol to transfer data, processing of data flow between the 100Mb / s and 2.5Gb / s. In this way, the DWDM-based networks in the transmission of a laser channel at different speeds of different types of data traffic. From the point of view of QoS (quality of service), the DWDM-based network to cost-effective way to respond quickly to customer bandwidth demands and protocol changes.
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