A Wavelength Division Multiplexing (WDM) system is a high-speed optical transmission system that simultaneously transports optical signals of different wavelengths over a single optical fiber. WDM was developed as a next generation optical signal transport technology after traditional Time Division Multiplexed (TDM) systems offering much greater potential capacities. TDM is the most popular tec...

In this paper we give short review of actual state of WDM networks and we wanted to give outline of new trends, challenges and futures of WDM networks, mainly in view of optical

In this paper, we consider three options for using WDM (Wavelength Division Multiplexing) technology to carry IP traffic. First, WDM multiplexers/demultiplexers (transmission technology) can be used on direct physical links between IP routers to increase the transmission bandwidth of fibers. Second, WDM networking technology (with reconfigurable add/drop multiplexers, crossconnects, and tunable...

We point out a serendipitous link between warm dark matter (WDM) models for structure formation on the one hand and the high sensitivity energy range (1-10 keV) for x-ray photon detection on the Chandra and XMM-Newton observatories on the other. This fortuitous match may provide either a direct detection of the dark matter or exclusion of many candidates. We estimate expected x-ray fluxes from ...

An IP (Internet Protocol) over WDM network is expected to be an infrastructure for the next–generation Internet by directly carrying IP packets on the WDM–based network. Among several architectures for IP over WDM networks, one promising way is to overlay a logical topology consisting of lightpaths over the physical WDM network, so that IP packets are carried using the lightpaths. The conventio...

Optical technology gains extensive attention and ever increasing improvement because of the huge amount of network traffic caused by the growing number of internet users and their rising demands. However, with wavelength division multiplexing (WDM), it is easier to take the advantage of optical networks and optical burst switching (OBS) and to construct WDM networks with low delay rates and bet...