Scheduling Based on Minimal Conversion Degree With Respect to Wavelength Conversion and Coding in Optical Multicast Node

Abstract

Optical multicast collision occurs more frequently for the replication and forwarding of optical multicast increase in the switch node. In this letter, an optical multicast switching node architecture configured with wavelength conversion and network coding is proposed. The proposed node architecture uses a group of output shared wavelength converters in the wavelength domain and a group of feedback shared encoders to resolve the optical multicast collision. To minimize the total conversion degree, we propose an improved algorithm, maximal weighted stable set, to assign wavelength converter with respect to the wavelength conversion degree as the weight. Concretely, the graph coloring matching algorithm is used to select the wavelength converter with minimal wavelength conversion degrees. Compared with the node architecture with two layers wavelength conversion and with full range wavelength conversion, analyses and simulation results show that the proposed node architecture largely reduces the packet loss probability with low cost of wavelength conversion and results in a better performance to solve multicast collision.Index Terms-All-optical multicast switch, limited range of wavelength converter, network coding, packet scheduling.

Longest Path Reroute to Optimize the Optical Multicast Routing in Sparse Splitting WDM Networks

“…Figure 2 shows a weighted, undirected graph and a multicast request 𝑟(𝑠, 𝐷) = 𝑟(𝑠, (4,5,7)). The shortest path heuristic algorithm is used to find the lower cost tree from 𝑠 to 𝐷, and the resulting lower cost tree is marked with bold line.…”

“…Optical multicast has attracted much considerable interest due to supporting efficiently the transport for multicast application and providing flexible access to the immense bandwidth of the optical fiber and WDM networks [1][2][3][4][5][6]. The classical multicast requests are realized by the way of repeating unicast in optical layer because of the constraint by network node light-splitting and leading to the problem of low wavelength resource utilization.…”