This research work presents aGenetic Algorithm (GA) heuristic approach to solve the static Routing and Wavelength Assignment (RWA) problem in Wavelength Division Multiplexing (WDM) networks under wavelength continuity constraint. The RWA problem is modeled as an Integer Linear Programming (ILP) problem with the optimization objective to balance the network load among the connection requests. We...

An important goal of the design of WDM (wavelength division multiplexing) networks is to use less wavelengths to serve more communication needs. According to the wavelength conflict rule, we know that the number of wavelengths required in a WDM network is at least equal to the maximal number of channels over a fiber (called maximal link load) in the network. By placing wavelength converters at ...

A new multiple access protocol is developed for optical local area networks based on a passive star topology. The protocol uses wavelength division multiplexing (WDM), and combines the advantages of both random-access and scheduled-access sharing schemes, e.g., fixed pre-assigned TDMA and WDM, into a protocol that is highly bandwidth-efficient. No central control is required among users, and th...

Wavelength division multiplexing (WDM), the technology that utilizes different wavelengths of carrier signal as independent information channels and helps to realize enhanced density functional diversity, is desired in various acoustic applications for growing demand higher transmission efficiency lower cost. In this paper, we marry rising concept metagrating with WDM demonstrate interesting di...

One of the major concerns in optical networks is the bandwidth underutilization problem. In fact, as WDM technology keeps maturing, there is a bandwidth gap between the transmission speed of a wavelength channel (over a Gb/s) and the capacity requirement of customers’ connections. In this regard, building cost-efficient optical networks requires an efficient traffic grooming solution at the hig...

Optical Wavelength Division Multiplexing (WDM) networks are high capacity telecommunications networks based on optical technologies and components that provide routing and restoration at wavelength level. High Capacity Optical WDM Networks are either reconfigured or reroute to meet the dynamic traffic demand of the various applications. However the demand varies with time and infrastructural de...

In this paper, we propose a MAC protocol for a passive optical network (PON) employing wavelength-division multiplexing (WDM) with arrayed-waveguide gratings (AWGs) performing routing functionality at the remote node. In proposed MAC protocol, we employ a Request/Permit based MAC protocol using multipoint control protocol (MPCP). It is simulated using OPNET and their performances are evaluated ...

In this paper we introduce new, bacterial evolutionary algorithm (BEA) based methods for routing unicast and multicast demands in grooming capable multi-layer optical wavelength division multiplexing (WDM) networks. The methods introduced are compared with both well known heuristic methods, accumulative shortest path heuristic (ASP) and minimum path heuristic (MPH), and as well as with ILP. We ...

This paper addresses the natural relaxation of the path coloring problem, in which one needs to color directed paths on a symmetric directed graph with a minimum number of colors, in such a way that paths using the same arc of the graph have different colors. This classic combinatorial problem finds applications in the minimization of the number of wavelengths in wavelength division multiplexin...

In this paper, we introduce the principle and demonstrate the feasibility of a tunable multiple-cavity solid-spaced bandpass filter for WDM (Wavelength Division Multiplexing) applications, which uses a vernier effect since the two cavities have different thermal sensitivities. A set of specific wavelengths can be addressed in the whole C-Band by using temperature changes less than 100 degrees C...