Reasearch On Management Scheme For Rapid Lightpath Provisioning And Releasing In Multi-core Fiber Networks

As the rapid development of information technologies,such as cloud computing,big data and Internet of Things,communication networks are facing great challenges of traffic loads.Multi-core fiber networks are expected to overcome some physical barriers and enhance the overall capacity of optical transmission systems.However,the lightpath provisioning time or releasing time is adversely affected by the time that optical amplifiers require to adjust to a newly added or terminated signal power.This shortcoming is particularly true with multi-core erbium doped amplifiers.This paper proposes a fiber span power management scheme based on the use of dummy wavelength signals that are used to shorten the lightpath provisioning and releasing times.With the shorter time of lightpath provisioning and releasing procedures,the total time that is required to reserve wavelengths in the system is decreased,which means that network resources are used more efficiently.As a result,the blocking performance and average waiting time in the system are improved.To evaluate the effectiveness of the proposed scheme for blocking and average waiting time as a function of the number of different types of dummy and lightpath wavelengths used in each span,this paper introduces analytical model.Through the model analysis,this paper obtain the number of steady states in the system,the state transitions and the state equilibrium equations.The analytical model exactly evaluates the performance of the proposed scheme,and hence it is useful as a reference model or tool to validate the simulation results.In the introduced model,the ratio of the number of activating and activated dummy wavelengths to the number of dummy wavelengths in each span is considered from the range of zero to one.The analysis reveals that the performance of the proposed scheme depends on α,which is the ratio of the number of dummy wavelengths to the number of dummy and lightpath wavelengths in each span,and there exists a point of α where the blocking probability becomes minimum.We observe that as α increases,the average waiting time for lightpath provisioning decreases.To express the significance of the proposed scheme,we compare it with conventional approaches.We observe that the proposed scheme outperforms the conventional approaches in terms of blocking probability and average waiting time.Then,this paper introduces simulation study and we observe that the simulation results are comparable with analytical results within the maximum 5% error rate.Furthermore,we evaluate the performance of the proposed scheme in the context of a full-fledged optical networks.We observe that the proposed scheme also outperforms the conventional approaches in terms of average waiting time in the context of a fullfledged optical networks.