Given a set of lightpath connection requests in an all-10 Gb/s optical dense wavelength division multiplexed (DWDM) Ethernet network, lightpaths are designed. In addition the wavelength channels are assigned subject to minimization of the channel blocking and provisional requests satisfying the limits due to accumulative linear dispersion effects over the hops. This paper proposes a routing and...

ICT services are a key element of communications and important for socio-economic development. In recognition of the importance of this, the Tanzanian Government started to implement a National ICT Broadband Infrastructure Fibre Optic Backbone (NICTBB) in 2009; this development was planned to be implemented in four phases using an optical dense wavelength division multiplexing (DWDM) network te...

The Internet is evolving from best-effort service toward an integrated or differentiate service framework with Quality of Service (QoS) assurances that are required for new multimedia service applications. IP/MPLS based control plane combined with wavelength-routed Dense Wavelength Division Multiplexed (DWDM) optical network is viewed as a very promising approach for realizing future re-configu...

The traffic demands keep increasing rapidly due to the growing number of broadband users and the existing and upcoming applications available to the end users. In addition, the enormous increase in on-line content and video traffic offered by the Internet is expected to continue. As optical technology can inherently support very high capacities, it is clear that it will continue to expand and p...

Dense wavelength division multiplexing (DWDM) opaque networks use expensive optical/electrical/optical (O/E/O) conversion at each end of a fiber link. Several technological advances have been used in an attempt to reduce the O/E/O conversion cost component: improved optical amplifiers using distributed Raman amplification allow signals to traverse longer distances without amplification and/or r...

Free space optical (FSO) communication has become a viable technology for a broadband wireless application which offers the potential of high bandwidth capacity over unlicensed optical wavelength. Atmospheric turbulence has most significant impact on the quality of laser beam propagating through the atmosphere over a long distance. For optical wireless communication system, most frequently used...

Optical burst switch (OBS) is considered to be a promising switch technology for the future network. In this paper, just-in-time (JIT), just-enough-time (JET) and horizon signalling schemes for OBS are presented. These signalling schemes run over a core dynamic wavelength division multiplexing (DWDM) network. The network is proposed to support IP, ATM and burst traffic. We apply the Poisson and...

We propose a simple and cost-effective method, using direct frequency modulation (FM) noncoherent detection (NCD) scheme, to suppress the nonlinear optical effects in dense wavelength division multiplexed (DWDM) communication. The FM transmitter comprises directly modulated distributed feedback laser saturable semiconductor amplifier. In NCD receiver, an slope filter as intensity (IM) signal co...

The planning problem of novel DWDM-centric converged metro/aggregation networks is solved by algorithms based on intelligent wavelength assignment and an auxiliary-graph approach that exploits load-balanced routing and the optical-multiplexing capability of WSSes.

The OADM based on DWDM technology is moving the telecommunications industry significantly closer to the development of optical networks. The OADM can be placed between two end terminals along any route and be substituted for an optical amplifier. Commercially available OADMs allow carriers to drop and/or add up to multi channels between DWDM terminals. By deploying an OADM instead of an optical...