Design of light-tree based logical topologies for multicast streams in wavelength routed optical networks

Abstract

Abstract-In this paper, we formulate an optimization problem for the design of light-tree based logical topology in Wavelength Division Multiplexing (WDM) networks. The problem is comprised of two parts: (1) multicast routing and wavelength assignment of light-trees, and (2) the design of light-tree based logical topology for multicast streams. In the first part, we use Mixed Integer Linear Programming (MILP) to solve the optimal routing and wavelength assignment problem of light-trees with an end-to-end delay bound, and obtain the optimal placement of power splitters and wavelength converters. The numerical results show that networks with just a few power splitters and wavelength converters can efficiently carry multicast data. In the second part, we extend the above formulation to design the logical topology based on light-trees for multicast streams. In our approach, a light-tree can carry data of multiple multicast streams, and data of a multicast stream may traverse multiple light-trees to reach a receiver. The numerical results show that our approach use network resources more efficiently, as compared to the approach with a separate light-tree for a multicast stream and to the approach of transporting multicast streams over lightpath based logical networks.

Dalgaboyu Bölümlemeli Çoğullama (DBÇ) Üzerinde Optik Çoğuşma Anahtarlama (OÇA) ve Çoğa Gönderim

“…Güç üleştirici çok pahalı olduğundan, ağın düğümlerinin sadece bir bölümünde kullanılır. Bu tip ağlar SeyrekDağılan (Sparse-Splitting) ağlar olarak adlandırılır [16].…”

Power-Aware Connection Provisioning for All-Optical Multicast Traffic in WDM Networks

“…In the first iteration, the Power Vector is initialized in step 1 with the least operational power values at the source nodes of the sessions under investigation 5 . In step 2, Q is constructed by populating it with all the outgoing links from these source nodes.…”

“…However, it is more critical for All-Optical Multicasting (AOM) Service [2][3] as the optical signal in this case undergoes additional power loss. The source of this extra power loss is the splitting of the power strength of the incoming signal at the branching nodes of the multicast delivery structures (lighttrees [4] or light-forests [5]) into multiple output links. Power splitting is done in the optical domain using configurable passive optical splitters.…”

Multicast traffic grooming in wavelength-routed WDM mesh networks using dynamically changing light-trees

“…All of these papers studied the multicast traffic grooming problem based on the lightpath wavelength channel model and approached the problem using integer linear programming (ILP) and heuristics. A more comprehensive study on this topic can be found in [11]. The authors proposed a unified ILP formula for static traffic, including unicast, multicast, and mixed traffic.…”