A Novel Scheme Of Subnet Partition In Avionics Optical Network And Wavelength Exchange Experiment

To the introduction of more advanced sensing and monitoring equipment in themilitary field, and further to meet the total throughput and the total bit rate networkcapacity requirements increasingly, as a result of the incomparable performance ofWDM and optical switching, i.e., high capacity, light weight, electro-magneticinterference (EMI) immunity, data transparency, security and low cost, advanced opticalnetworks provides a reliable way to offer efficient bandwidth and multi-functionaloptical path. Owing to its highly scalable, protocol independence, updating flexibility,and versatile light path, wavelength division multiplexing optical network have been asmain direction of development to realize the desired avionic network for the future.To avoid the restriction of a single switch interface, and competiton in the transportstream, as well as the increasement in the number of input wavelength due to thenumber of switch ports increasement, while quickly identifying a failure in the opticalnetwork node, it is possible to do some adjustments by subnet partition to meet thebusiness requirement of the avionics nodes selectively in avionics electro-opticalnetwork with a large number of communication nodes.Therefore, a hybrid switching structure based the FC electrical switching andWDM optical switching of avionic optical network, meet the requirements ofconnectivity among source/destination pairs with high bandwidth (> Gb/s), high degreeof connectivity, and low latency (commonly in seconds range). For some nodes withlarge traffic, wavelength routing communication can guarantee bandwidth and real-time;for some nodes with small traffic, the adoption of electricity exchange can sustain theinterconnection of a large number of ports.In this paper, the paper further proposed a novel scheme of subnet partition inavionics optical network based on the thought of multidimensional spatial clusteringiteration algorithm. The problem of network node traffic is converted to the question ofspatial clustering of avionics optical network nodes. First, nodes in avionic opticalnetwork completes the pretreatment preprocessing of the direction vector adjustment in the multidimensional space. Secondly, according to the density of multidimensionalspace, the nodes in network are divided into different space portions, which determinesthe initial number of cluster and the initial cluster center. Thirdly, do the clustering inmultidimensional space step-by-step until it is determined that the best clusters and therelative distances in the same cluster or between different inter-clusters. Fourthly, afterthe assessment of the relative distances, it completes subnet partition. Finally, throughcalculating the traffic factors of the various subnets, which tests the rationality of thedivision, and verifies the feasibility of the method by two instances of the model.In order to verify the reasonability of the introduction of WDM and opticalswitching in the FC avionics optical network, there are three test programs ofwavelength exchange experiments in avionics optical network are proposed in the paper.Then wavelength switching experiment system platform is established. What’s more,wavelength division multiplexing WDM module, optical switching OS module and FCemulation card module are included in the experimental test system, which realizes thefunction of multi-wavelength multiplexing/demultiplexing, and multi-wavelengthswitching. Finally, the problem of multi-level, multi-wavelength and multi-portcrosstalk signal brought by multiplexing/demultiplexing and optical switching isresearched in the last of the paper.