Yongmei Sun

Key module for a novel all-optical network coding scheme

We introduce a novel network-coding scheme that can be implemented in all-optical multicast networks. A simple and successful module based on the all-optical XOR gate is designed to realize the network coding scheme. The module is a key hardware component in realizing the proposed scheme. The working principle and the experimental results of the module are also presented. Experimental results show that the function of the module is sufficient in satisfying the requirements of the proposed network coding scheme.

A Quantum-Inspired Evolutionary Algorithm for Coding Resource Optimization based Network Coding Multicasting

This paper investigates the problem of minimizing the network coding resources while achieving the desired throughput in a multicast scenario. Since quantum-inspired evolutionary algorithm (QEA), a combination of quantum computing and evolutionary algorithm, can address NP-hard problem and is considered powerful in terms of global optimization, we propose an attempt to adapt QEA to avoid the computational complexity that makes the above problem NP-hard. The effectiveness and the applicability of QEA are demonstrated by carrying out simulation over a number of network topologies.

Probability Convergence based Particle Swarm Optimization for Multiple Constrained QoS Multicast Routing

In this paper, we proposed a novel probability convergence based particle swarm optimization algorithm for the multiple constrained QoS multicast routing. This algorithm is inspired from the probability convergence attributes. The main contents of this paper includes: (1) A novel particle sorting rule of swarm are designed. (2) A novel probability convergence mechanism is developed in the position updating phase. (3) A new anti-congestion tactic is introduced. Experiment result shows that the new algorithm has excellent performance in convergence speed and global astringency.

Research on performance of multicasting in optical packet switched networks

Different multicasting schemes in optical packet switched networks are discussed, including the parallel mode, serial mode, and hybrid mode multicasting schemes. Simulated modeling technique is applied to compare the network-level performance of the three multicasting schemes. A conclusion can be drawn from the results that since the hybrid-mode multicasting scheme can increase the multicast success ratio and reduce the packet retransmission times compared with the other two schemes, it is the best choice for delivering multicasting sessions in the optical packet switched networks.

Traffic Engineering-based Load Balancing Algorithm in GMPLS Networks

How to improve the whole processing capability, the availability and survivability of network by use of load balancing is studied in this paper. To solve the problem with dynamic traffic, a novel dynamic weight based traffic sharing (DW-TS) algorithm is proposed. In DW-TS, we introduce the idea of traffic engineering algorithm-minimum interference routing algorithm (MIRA) in generalized multi-protocol label switching (GMPLS) networks and define an exponential formula of dynamic weight. In this formula, the weight of link is adjusted dynamically according to both utilization and criticality of the link. In addition, traffic sharing is applied in routing and allocating process to enhance the survivability of network. Simulation results demonstrate that the whole availability and survivability of network is increased with DW-TS. Compared with traditional load balancing algorithms, DW-TS can reduce blocking probability of network with dynamic traffic significantly and the reduction is up to 30%.

Optical-layer multicast based on network coding

Summary form only given. Optical-layer multicast will be a promising solution for high-speed and high-bandwidth multicast applications. While network coding can achieve maximum multicast rate by allowing intermediate network nodes to combine the data received from different incoming links. Therefore, how to apply network coding to optical-layer multicast has been attracting much attention. Due to the limitation of optical buffering and optical processing capabilities, several critical issues should be addressed, e.g., constructing an optical multicast tree with minimum coding resource and finding a network coding scheme realized by practical optical hardware. In this talk, we introduce our research and development activities on the optical-layer multicast based on networking coding, which is partly supported by NSFC (No. 60772024). Firstly, we discuss an improved quantum-inspired evolutionary algorithm that allows different chromosomes to select different updating parameter at each generation. Its efficiency is verified with high success ratio and small number of coding nodes in constructing a multicast tree. Then, we present a network coding scheme that recoveries the original signals at each coding node. The kernel function can be realized by logical bit shifting and bitwise XOR in optical domain. Finally, we build an experimental network, on which optical multicast via network coding is successfully demonstrated.

A Source-oriented Failure Notification Mechanism with Adaptable Delay in ASON

By extending the functions of Resource ReSerVation Protocol-Traffic Engineering (RSVP-TE), a new mechanism of source-oriented failure notification via adaptable delay (S-AD-FNM) in Automatic Switching Optical Networking (ASON) is proposed in this paper. Simulation results showed that new mechanism can mitigate conflicts of resource reservation in the network failure recovery process to a certain extent.

Optical-layer multicast based on network coding (Abstract only)

Summary form only given. Optical-layer multicast will be a promising solution for high-speed and high-bandwidth multicast applications. While network coding can achieve maximum multicast rate by allowing intermediate network nodes to combine the data received from different incoming links. Therefore, how to apply network coding to optical-layer multicast has been attracting much attention. Due to the limitation of optical buffering and optical processing capabilities, several critical issues should be addressed, e.g., constructing an optical multicast tree with minimum coding resource and finding a network coding scheme realized by practical optical hardware. In this talk, we introduce our research and development activities on the optical-layer multicast based on networking coding, which is partly supported by NSFC (No. 60772024). Firstly, we discuss an improved quantum-inspired evolutionary algorithm that allows different chromosomes to select different updating parameter at each generation. Its efficiency is verified with high success ratio and small number of coding nodes in constructing a multicast tree. Then, we present a network coding scheme that recoveries the original signals at each coding node. The kernel function can be realized by logical bit shifting and bitwise XOR in optical domain. Finally, we build an experimental network, on which optical multicast via network coding is successfully demonstrated.

An Implementation of Sharing Lightpath in Distributed Lambda Grid Network

This paper investigates the problem how to schedule optical network resource in distributed lambda grid network. A novel scheme to share lightpath is proposed to deal with the resource allocation and sharing under the condition of multi-user and multi-task, which provide a new realization way of parallel processing in heterogeneous resource environment, and two kinds of sharing transfer mode are put forward to verdict the feasibility of sharing lightpath. The experimental results indicate that sharing lightpath schema is feasible and can greatly improve the bandwidth utilization of the network.