Studies On Optical Node In Intelligent Optical Networks

In recent years, DWDM (Dense Wavelength division multiplexing) technologyhas enabled the development of systems that are capable of providing large amountsof bandwidth. Some very important conceptions, i.e. WDM all-optical network (AON)and intelligent optical network (ION), automatic switching network (ASON) havebeen emerged during the development of WDM optical network to meet therequirement of new services (such as VoD, VoIP) and the development of networkintelligent. The research of this dissertation is support by National ScienceFoundation project Studies on Tb/S WDM optical network and intelligent opticalnode. The research in this dissertation includes several key techniques, such asarchitecture of Multi-Granularity OXC, wavelength routing algorithm, protection andrestoration strategy and optical performance monitoring technique. At the same time,a set of simulation platform of optical network which includes three physical opticalnodes and some virtual optical nodes was set up.In the theoretical part, the dissertation, for the first time, proposed priority-basedadaptive wavelength routing algorithm and RWA Algorithm based on Load Balance.Comparison with ordinary First-Fit and Random-Fit RWA algorithm shows that thealgorithms can reduce the network blocking probability, increase the networkperformance. The relationship between blocking probability and different networkcharacteristics such as span length, amplifier noise figure, PMD, filter concatenationare analyzed, a kind of RWA algorithm considering the physical impairmentconstraint is presented.Multi-granularity optical cross-connect (MG-OXC) has been proposed to reducethe size of optical switch for large capacity optical network. With MG-OXC, fiberswitching, wavebands switching and wavelength switching can be introduces intooptical network. In this thesis, we present ILP (integer liner plan) model and heuristicalgorithm to reduce the network resource such as number of ports and wavelength inoptical network using single-layer MG-OXC and multi-layer MG-OXC. For the firsttime, we proposed a novel dynamic routing and wavelength, waveband assignment(FCRWA) algorithm and lightpath grouping strategy considering the constraint ofcascaded (D)MUX impairment for dealing with multi-granularity traffic in opticaldomain.Network survivability refers to the ability of a network to maintain an acceptablelevel of service during a network or equipment failure. In this thesis we examinednetwork resource requirement using path protection/restoration and linkrestoration/protection strategy. We also proposed a model of protection switchingtimes for the different protection schemes based on a distributed control protocols forpath and link protection.In this paper, the math model that can describe the effect of SRS on pilot-tonedetection technique is developed. The experiment results show that this model canevaluate the effect accurately.In the experimental part, three sets of MG-OXC that can support two fiber portsswitching, two waveband ports switching and four wavelength ports switching aredesigned and achieved in dissertation. Through three physical optical nodes andcomputer simulated virtual nodes, a set of simulation platform of optical network wasestablished. That will act as foundation role for the future studies.