In this paper, we study the routing and wavelength assignment (RWA) problem in multi-segment optical networks. In multi-segment optical networks, each segment has different resource availability or hardware Characteristics. The differences between multi-segment optical networks and homogeneous optical networks are discussed. We then present a resource abstraction technique called Blocking Islan...

A new adaptive RWA (Routing and Wavelength Assignment) algorithm is proposed, which may be used in photonic networks with no wavelength conversion. The problem we address is how to increase the utilization of WDM network resources by taking account of future demand efficiently. In the proposed method, blocking probability is minimized by taking account of future path establishment, using a meth...

We consider the problem of routing and assignment of wavelength (RAW) in optical networks. Given a set of requests for all-optical connections (or lightpaths), the problem is to [a)find routes from the source nodes to their respective destination nodes, and [ b) assign wavelengths to these routes. Since the number of wavelengths is limited, lightpaths cannot be established between every pair of...

In wavelength-routed WDM networks, blocking probability of lightpath establishments is generally high due to coarse granularity and wavelength continuity constraint. Therefore, blocking of lightpath establishments is one of crucial issues which must be resolved. Multifiber environments reduce blocking probability of lightpath establishments because each link consists of multiple fibers and mult...

Optical network are used widely in all types of telecommunication networks. These have capability of transmitting large amount of data across the network. It uses the light beams to transmit data over various segment.WDM is a technology that plays a vital role in bandwidth utilization. By means of this technology the bandwidth can be utilized effectively and provide a better way of communicatio...

In this paper, we propose a novel fuzzy-based framework for routing and wavelength assignment in alloptical DWDM backbone networks with sparse wavelength conversion capabilities. While most of the previous work in this field focuses on optical networks without wavelength conversion with full wavelength conversion capabilities, in this work we study networks with sparse wavelength conversion res...

We propose an ant-based algorithm to improve the alternate routing scheme for dynamic Routing and Wavelength Assignment (RWA) in all-optical wavelength-divisionmultiplexing (WDM) networks. In our algorithm, we adopt a novel twin routing table structure that comprises both a P-route table for connection setup and a pheromone table for ants’ foraging. The P-route table contains P alternate routes...

InGeneralized Multiprotocol Label Switching (G,MPLS) networks, the Routing and Wavelength Assignment (RWA) problem is important to realize the Quality of Service (QoS). In this paper, we put forward the blocking probability model with sparse wavelength conversion. As for the wavelength assignment subproblem, we formulate it as a Markov Decision Process (MDP) in order to realize the multi-class ...