Essay --

damage AWARE ROUTING In WDM technology, the capacity of a fiber is divided into some(prenominal) subscribers by using light paths. In these paths traffic flows. Traffic surrounded by a pair of nodes may not fill up the procurable bandwidth of a light path. The ne cardinalrk performance is affected by the transmittance impairments which argon due to the non ideal opthalmic fortunes. Since we have optical amplifier, optical switches and other optical devices and soon we have all optical equipments with the clip and it is possibility that the entire earnings will be optical cyberspace. ethereal Optical cyberspaceOpaque Network There are two graphemes of networks. These are opaque network and transparent network. In opaque network we have to do Optical-Electrical-Optical modulation at all nodes in the path. This type of network is costly because if we make a nationwide network thusly we will have to use a large no. of routers. exactly to make it less expensive we can use tr anslucent network. In translucent network the regeneration is done only on a few nodes instead of all nodes.Transparent Network The other network that is transparent is less costly because there is no need of OEO conversion at the intermediate nodes. We can send analog token in the transparent network. The size of transparent network is determined by impairments effect such as Chromatic dispersion (CD), attenuation, crosstalk, noise etc. do of Transmission Impairments on Routing and Wavelength AssignmentWhen signal travels from source to destination accordingly it may be ruined by linear and non-linear impairments. Linear impairments are amplifier noise, Group velocity dispersion (GVD), polarization mode dispersion (PMD), component crosstalk. The nonlinear impairments are self-phase modulation... ...s called Physical layer blocking. Advantages Network load decreases by using IABP and IAFFAbout 30 % reduction in blocking conjure admission criteria not only depends on t he resource availability only if also on quality of light paths signal A light path with good signal qualityNetwork resources are in intelligent controlNetwork used to a greater extent efficientlyDisadvantagesThis technology cannot compute a route with minimal impairmentsTo rally a qualified route path for the connection request it of necessity more than one trialAlgorithm does not consider residual-dispersion accumulation, military force divergence, polarization-dependent loss gain (PDLIPDG), filter concatenation, signal transient, fiber nonlinearities. When the data set increases to 40 Gbps and furthermore, impairments become even more difficultAs load increases the call blocking increases