Complete Analysis on DWDM Technology
It has been over 20 years since DWDM technology first came on the scene, and in the last two decades it has revolutionized the transmission of information over long distances. At present, DWDM technology is so widely applied that we almost forget that there was a time when it did not exist and when accessing information from the other side of the globe was expensive and slow.
DWDM Technology: Data in a RainbowPrinciple
DWDM has capability to expand capacity and can serve as backup bandwidth without a need to install new fibers, thus it is ready made for long distance telecommunication services.
DWDM can also be used in various networks like sensor networks, remote radar networks, tele spectroscopic process control network and many more networks.
By the use of only two fibers, 100% protected ring with 16 separate communication signals can be constructed deploying DWDM terminals as these are self healing rings.
In order to meet the demand in fast growing industrial base, DWDM system can be used for existing thin fiber plants as these plants cannot support high bit rates.
Transparency—Because DWDM is a physical layer architecture, it can transparently support both TDM and data formats such as ATM, Gigabit Ethernet, ESCON, and Fibre Channel with open interfaces over a common physical layer.
Scalability—DWDM can leverage the abundance of dark fiber in many metropolitan area and enterprise networks to quickly meet demand for capacity on point-to-point links and on spans of existing SONET/SDH rings.
Dynamic provisioning—Fast, simple, and dynamic provisioning of network connections give providers the ability to provide high-bandwidth services in days rather than months.
DWDM Backbone Networks
2. Wavelength Routing With Electronic TDM
3. All Optical DWDM Network
Deploy DWDM Over CWDM NetworkTo combine the DWDM wavelengths with CWDM wavelengths, both CWDM MUX/DEMUX and DWDM MUX/DEMUXs should be used. The following picture shows the connection methods for hybrid CWDM and DWDM by using 1550nm channel. On both ends of the fiber link, a CWDM MUX/DEMUX and a DWDM MUX/DEMUX with corresponding wavelengths are deployed. Connect the line port of the DWDM MUX/DEMUX to the 1530nm/1550nm channel port of the CWDM MUX/DEMUX, the DWDM wavelengths can be added to the existing CWDM network.
The wavelengths should be carefully considered during the selection of the CWDM MUX/DEMUX and DWDM MUX/DEMUX. As above mentioned, wavelengths of 1530 nm and 1550 nm are suggested to be used for CWDM and DWDM hybrid. The following picture shows the suggested wavelengths for CWDM and DWDM hybrid. If the 1530nm port is to be used, the DWDM MUX/DEMUX channel ports are suggested to range from 1529.55 nm to 1536.61 nm. For 1550nm port, the channel ports of the DWDM MUX/DEMUX is suggested to range from 1545.32 nm to 1557.36 nm.