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Zhao J.,Hebei University of Engineering | Yao Q.,Hebei University of Engineering | Ren D.,Hebei University of Engineering | Li W.,Beijing University of Posts and Telecommunications | Zhao W.,Research Institute of Telecommunication and Transmission
Optics Communications | Year: 2015

The software-defined networking has emerged as an efficient network technology. It is capable of supporting the dynamic nature of future network functions and intelligent applications to provide the customized services. However, the physical impairments are still the main factor affecting the transmission quality of the signal. Meanwhile, the future network design should also take the growing energy consumption into account. To address the above issues, we first present an impairment-energy aware control plane for single domain management based on the extended OpenFlow protocol in software-defined flexible optical networks. Then, a service-oriented multi-domain control scheme is designed for the network scalability requirement. To implement our scheme, a multi-domain quality of transmission (QoT) and energy aware routing and spectrum assignment (RSA) algorithm is proposed for the diffserv quality of service (QoS) and energy saving consideration. The experimental works validate that our proposed RSA scheme makes a better balance between the QoT and the energy efficiency and also improves the spectrum resources utilization with the acceptable average set up delay. © 2014 Elsevier B.V. All rights reserved.


Zhao J.-J.,Hebei University of Engineering | Zhao J.-J.,Handan Key Laboratory of Optical Fiber Communication and Broadband Access Technologies | Guo K.,Hebei University of Engineering | Guo K.,Handan Key Laboratory of Optical Fiber Communication and Broadband Access Technologies | And 4 more authors.
Tongxin Xuebao/Journal on Communications | Year: 2012

For the accurate assessment of physical impairments, the suppression or enhancement effect of self phase modulation (SPM) on group velocity dispersion (GVD) were analyzed. Then, a pulse width model based on their combined effects on signal distortion was proposed. This model considered the effects of combined physical impairments, and it was applied in the simulation of the impairment-aware routing and wavelength assignment (IA-RWA) algorithm. The results indicate that comprehensive consideration of the effects caused by combined physical impairments is conductive to accurately avoid more serious physical impairments during routing and reduces blocking rate.


Zhao J.,Hebei University of Engineering | Zhao J.,Research Institute of Telecommunication and Transmission | Li W.,Hebei University of Engineering | Li W.,Research Institute of Telecommunication and Transmission | And 4 more authors.
IEEE Communications Letters | Year: 2013

In this paper, a bidimensional Quality of Service (QoS) differentiation framework, which considers both the physical layer impairments (PLIs) and the set-up delay as well as the impact of the former on the latter, is proposed to implement service differentiation in transparent optical networks. In addition, a new PLI-aware routing and wavelength assignment (RWA) algorithm based on the proposed framework is designed and simulation results show that the proposed algorithm can reduce the blocking probability (BP) of the network, guarantee the quality of transmission (QoT), and low set-up delay for multiservice offerings. © 1997-2012 IEEE.


Zhao J.,Hebei University of Engineering | Li W.,Hebei University of Engineering | Zhang S.,Hebei University of Engineering | Guo K.,Hebei University of Engineering | Zhao W.,Research Institute of Telecommunication and Transmission
Journal of Optical Communications | Year: 2012

As the network is converting to transparent optical networks, the impact of physical layer impairments on transmission performance can't be ignored. The impairments will decrease the quality of signals. To find a lightpath with high quality of transmission (QoT), this paper adds impairment constraints to the routing and wavelength algorithm based on wavelength rotation graph (WRG-RWA) and proposes impairment aware WRG-RWA algorithm. The constraints consider amplified spontaneous emission noises and polarization mode dispersion which are the most important liner impairments. The new algorithm estimates the impact of the impairments after the route is selected, and selects another route when the previous one fails in comparing with the constraints. By simulating, the new algorithm has preferably improvement on blocking probability and wavelength efficiency by contrast with the WRG-RWA algorithm and the impairment aware FF algorithm. The simulation results show the new algorithm can effectively decrease the blocking probability of transmission and improve the performance of optical networks.


Zhao J.,Hebei University of Engineering | Wang W.,Hebei University of Engineering | Li W.,State Key Laboratory of Information Photonics and Optical Communications | Ren D.,Hebei University of Engineering | And 2 more authors.
Photonic Network Communications | Year: 2016

In mixed line rates elastic optical networks, different line rate signals can coexist on the same fiber. As different line rates coexist in the same fiber, the impairments, especially the cross-phase modulation (XPM), become more and more serious affecting the quality of transmission of signals. Moreover, the spectrum constraints limit the efficient allocation of spectrum resources. In this paper, we propose a novel spectrum Partition-topology Plane impairments aware routing and spectrum assignment algorithm to set up lightpaths for connection requests, therefore decreasing the XPM impairments and increasing spectrum utilization. The proposed algorithm can satisfy the spectrum constraints restriction and avoid the XPM impairment together. The simulation results show that the proposed algorithm can significantly improve the performance of networks in blocking probability and the spectrum efficiency. © 2016 Springer Science+Business Media New York


Zhao J.-J.,Hebei University of Engineering | Zhang S.-G.,Hebei University of Engineering | Zhao W.-Y.,Research Institute of Telecommunication and Transmission
Tongxin Xuebao/Journal on Communications | Year: 2010

Based on distributing uniformly virtual network topology links and associated wavelengths to the surface of rotating sphere, a new wavelength rotation graph model of wavelength switching optical network (WSON) was constructed, and a creative method to solve the routing and wavelength assignment (RWA) problems was proposed. The simulation results show that if the wavelength number of each link is set separately to 4 and 8, the average blocking probability of the RWA based on the rotation graph model reduces by 5.03% and 9.71%, and the average resource utilization increases by 3.3% and 1.54% respectively, as compared with the existing model. This method would be useful for solving the problem of optical network RWA which has wavelength conversion capabilities.

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