Wavelength Conversion

The Internet protocol (IP) plays a dominant role in current networking technologies and the wavelength division multiplexing (WDM) technology provides tremendous bandwidth. The IP-over-WDM is becoming the right choice for next-generation Internet networks where optical burst switches (OBS) is a promising technique to bridge the gap between IP and WDM. However, traditional OBS scheduling algorithms either have low computational complexity

Abstract—This paper presents the results of the optical packet switched network (OPSnet) project, which investigated the de-sign of an asynchronous optical packet switch suitable for the core of an optical transport network (OTN). The requirements for the switch were to ...

The significance of Generalized MultiProtocol Label Switching (GMPLS) has been demonstrated by its significant adoption in optical networks. In recent years GMPLS has become the most globalized solution, which operates, and is implemented in core networks. This new technology was developed to support the Internet by providing many additional services for applications using the Internet Protocol (IP). The focus of this paper is on the issues and constraints that have arisen in the process of applying GMPLS in optical networks such as Routing and Wavelength Assignment (RWA). These two are a concatenated issue. One affects the other. The blocking probability in finding a route is potentially high without the wavelength conversion capability. This paper will also demonstrate how to find the least significant blocking probability in a route using the existing proposed RWA algorithm. We demonstrate that using the generalised probability of blocking, and applying this blocking probability ...

Monolithic approaches to wavelength converters have been demonstrated and show promise to allow for the high-speed conversion of one wavelength to another without requiring the signal to pass through off-chip electronics. In this paper, we describe our research, undertaken jointly with the University of California at Santa Barbara and with Stanford University, into novel approaches for monolithically integrating Wavelength Converters

Wavelength routed optical networks have emerged as a technology that can effectively utilize the enormous bandwidth of the optical fiber. Wavelength converters play an important role in enhancing the fiber utilization and reducing the overall call blocking probability of the network. As the distortion of the optical signal increases with the increase in the range of wavelength conversion in optical wavelength converters, limited range wavelength conversion assumes importance. Placement of wavelength converters is a NP complete problem in an arbitrary mesh network. In this paper, we investigate heuristics for placing limited range wavelength converters in arbitrary mesh wavelength routed optical networks. The objective is to achieve near optimal placement of limited range wavelength converters resulting in reduced blocking probabilities and low distortion of the optical signal. The proposed heuristic is to place limited range wavelength converters at the most congested nodes, nodes which lie on the long lightpaths and nodes where conversion of the optical signals is significantly high. We observe that limited range converters at a few nodes can provide almost the entire improvement in the blocking probability as the full range wavelength converters placed at all the nodes. Congestion control in the network is brought about by dynamically adjusting the weights of the channels in the link thereby balancing the load and reducing the average delay of the traffic in the entire network. Simulations have been carried out on a 12-node ring network, 14-node NSFNET, 19-node European Optical Network (EON), 30-node INET network and the results agree with the analysis

Jennifer Yates a, Jonathan Laceyb and David Everittc a Software Engineering Research Centre, Royal Melbourne Institute of Technology University, Melbourne, Australia E-mail: jyates@serc.rmit.edu.au b Australian Photonics Cooperative Research Centre, ...