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The higher the bit rate, the larger needs from the power budget meaning that the lasers must have better signal to noise figures, the amplifier spacing needs to be reduced, amplification must be higher for example, by employing two DWDM Optical Amplifiers in series. Typically 64 DWDM channels at 10 Gbps reach a maximum distance of around 1, km with an amplifier spacing close to km. Long-distance transmission systems beyond 1, km and up to 4, km will also be commercially available using advanced and much more expensive systems.
WDM technology may also be used in Passive Optical Networks PONs which are access networks in which the entire transport, switching and routing happens in optical mode. With the inclusion of recent 3R reshape, retime, retransmit devices, internal towards the DWDM system, circuits utilizing only DWDM equipment can now be built that may span the country.
New performance monitoring capabilities happen to be built into these devices so that maintenance and repair of the link can be done. With DWDM as the transmission method, the bandwidth of the existing fiber plant is maximized. The main differences between sdh and dwdm are listed below:. It is a telecommunications network transmission technology designed for the transport of large data volumes across large scale digital networks.
The laying cable between switch sites is very expensive. It increases traffic capacity of a cable by increasing bit rate. Synchronous Optical Network is internationally used. It characteristics are founded on high order multiplexing. These are the technologies that provide quite fast and low priced network interconnection than PDH which stands for Plesiochronous Digital Hierarchy.
Non availability of world standard on the digital formats. No optical interfaces world standard and without an optical level, networking is not possible. Some of the most common advantages enjoyed by the usage of SDH include: optical interfaces capability of powerful management world standard digital format synchronous structure is flexible cost effective and easy traffic cross connection capacity and add and drop facility reduced networking cost due to the transversal compatibility forward and backward compatibility Apart from all the advantages mentioned above, the SDH also has various management capabilities such as performance management, security and access management, configuration management and the event or the alarm management.
Previous Next. Lomoveishiy — Finland. Raymond — USA. Stay in touch via e-mail newsletter! Subscribe to our mailing list for weekly performance tips. This website uses cookies to improve your experience. The maximum reach of CWDM is about km. While an amplified DWDM system can go much further. Cooling laser adopts temperature tuning which ensures better performance, higher safety, and longer lifespan of the DWDM system.
But it also consumes more power than the electronic tuning uncooled laser used by a CWDM system. Because the range of temperature distribution is nonuniform in a very wide wavelength, so the temperature tuning is very difficult to realize, thus using the cooling laser technique increases the cost of the DWDM system.
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