With the rise in demand for channel capacity, Wavelength Division Multiplexing (WDM) technique is employed in optical communication networks. Gain Flattened Erbium Doped Fiber Amplifier (EDFA) is used in optical WDM system to obtain a uniform output power level. The performance of EDFA depends on various parameters such as fiber length, pump power, pumping wavelength and pumping technique. The ...

This paper presents a method for constructing logical topology in multi-hop WDM networks hierarchically. Our logical topology can be built over WDM ring networks with only three ADMs (Add-Drop Multiplexers) and transceivers per node. We aim to realize low-cost WDMs that can be deployed for MANs and LANs. Due to well constructed hierarchical topology, both the maximum distance between two nodes ...

Abstract The ASEAN region experiences several socio-economic and environmental challenges brought on by rapid urbanisation, rising living standards, population growth, climate change. Such are severely impacting the region’s water access long-term security. As a response to these challenges, governments have identified urban demand management (WDM) as one of measures strategic importance. WDM a...

This paper describes the pumping schemes for ultra-wideband (UWB) WDM transmission using only distributed Raman amplification. By numerical analysis based on Gaussian noise model, we evaluate amplification performances all-Raman UWB-WDM higher-order and/or forward in addition to conventional 1st-order backward pumping. Moreover, discuss effect of gain bidirectional configuration, and clarify th...

The first generation of optical networks employed primarily static point-to-point WDM systems to provide increased network capacity. Optical networks using WDM are now widely deployed in carrier networks, particularly in long-haul networks. For the most part, these point-to-point WDM systems provide tens of wavelengths worth of capacity over a single fiber pair, with each wavelength operating a...

A novel bandwidth assignment algorithm in WDM Ethernet Passive Optical Networks, called DyWaS-SLA, is proposed not only to provide service differentiation but also to offer subscriber differentiation. Simulation results show that DyWaS-SLA outperforms other bandwidth allocation algorithms in WDM-EPONs as it makes fairer bandwidth distribution than those methods. Consequently, it always insures ...

As the Internet traffic volume increases, the IP over WDM network is expected to be the dominant architecture in future Internet backbone networks. For IP routers to transfer their traffic, the virtual topology should be constructed from lightpaths supplied by WDM networks. To reflect the demand-supply relation of IP and WDM layers, we present the total combined cost as the network design goal ...

WDM networks play a significant role in telecommunication systems to face the demand for wider bandwidths. Technological growth and the emergence of new advents in WDM technologies require wavelengthrouted channel, which will implement high bit rate applications in the network transport layer. Several researches were carried out and possible technologies were implemented to improve the performa...

An important requirement in any high speed network is to ensure the network’s survivability, i.e., the ability to provide reroutes of ongoing connections after the failure of network components. We consider the problem of embedding an IP layer topology in the WDM transport network layer with the objective of achieving the network’s survivability in the IP layer. Specifically, we consider the pr...

This contribution gives a short introduction in optical WDM (Wavelength Division Multiplexing) networks with special focus on wide-area transport networks and on a possible evolution scenario towards all-optical networks. Furthermore, design and planning aspects for a WDM network are discussed. This comprises a short overview on a planning process in general and a presentation of some specific ...