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Difference between DWDM and OTN
  • Last Updated : 19 Jan, 2021

1. Dense wavelength division multiplexers (DWDM) :
DWDM refers to Dense wavelength division multiplexers. It is the modules that put data from different sources together on a fiber optic cable then these modules further increases system bandwidth and capacity by using closely spaced wavelengths to carry multiple signals on same cables. The channel spacing is reduces to 1.6 nm and less . The cost effective ways of increasing capacity without replacing fiber. There are commercial systems available with the capacities of 32 channels and upwards.

2. Optical transport network (OTN) :
OTN refers to optical transport network, this allow a network-wide framework that adds SONET/SDH-like features like communication channels, performance monitoring, fault detection, and multiplexing hierarchy to WDM equipment. This works at Layer 1 to accumulate various tasks into the tunnel of WDM technologies, increasing the transmission distance and volume of fiber optics. This means that OTN frame structure combines the flexibility of SONET technology with the bandwidth expandability of DWDM, thus it can provide functionality of transport, multiplexing, routing, management, supervision, and survivability of optical channels carrying client signals.

Difference between DWDM and OTN :

1. DWDM is WDM utilizing closely spaced channels. OTN is asynchronous mapping of payloads.
2. The networking mode of DWDM is basically point-to-point, chain, star and ring networking. The networking mode of OTN is usually a ring network, mesh network and other networking modes
3. This is basically a technology  . This is the complete set which involves DWDM technology with Manageability features added to it (DWDM) .
4. It is mainly used in inter provincial trunk network and intra provincial backbone network. It provides a very ideal solution for large broadband granular services.
5. Its main component are multiplexer, demultiplexer, amplifier and ROADM. It is collection of optical cross-connector (OXC) and optical add/drop multiplexer (OADM), possesses functions like optical cross-ability and wavelength conversion. 
6.  It is applied in fiber optical transceiver to increase bandwidth over existing fiber optic backbones. It can provide functionality of transport, management, supervision, multiplexing, routing and survivability of optical channels carrying client signals.
7. It features include transparency,  dynamic provisioning and  scalability.  It adds features like fault detection, performance monitoring, communication channels, and multiplexing hierarchy to WDM equipment. 


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