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Routing and Wavelength Assignment Algorithm in Dynamic Optical Network Considering the Physical Parameters

Author: WangTeng
Tutor: LiWei
School: Huazhong University of Science and Technology
Course: Optical Engineering
Keywords: Dynamic Optical Network Routing and wavelength assignment algorithm DPSK system BER value Wavelength layered Blocking rate
CLC: TN929.1
Type: Master's thesis
Year: 2009
Downloads: 40
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Abstract


With the advent of the information age and the development of network technology , global network business is showing a trend of explosive growth , an urgent requirement to expand the capacity of the WAN backbone communications network . Dynamic routing and wavelength assignment (RWA) optical network is considered to be the most competitive candidate in the next generation wide-area backbone network . RWA problem is an important problem in the dynamic optical networks , it refers to the network somewhere on the inter-node optical path establishment request , how to find the route from the source node to the destination node and in the route is allocated wavelength . Optimize the optical channel selection and wavelength assignment is the core of the network design problem , whose main task is to find a suitable optical path and whom a reasonable allocation of wavelength , so that the limited resources to give full play to the role of optical network to provide the greatest possible communication capacity. The RWA algorithm practical applications , with little regard to the underlying physical quantities RWA algorithms . In order to better solve the RWA problem , this paper proposes an associated underlying physical dynamic optical network routing and wavelength . The core idea of the algorithm is : (1) the DPSK system signal by the underlying physical quantity ( the dispersion of the optical fiber , the OXC node crosstalk , ASE, XPM, the FWM , the SPM , etc.) the impact is given in the form of a bit error rate (BER) , and so that the bit error rate (BER) to become an important basis for the algorithm to select routes ; ( 2 ) algorithm is a RWA algorithm based on the wavelength of the hierarchical model , making the optical network routing and wavelength assignment two sub-problems to solve synchronization . In the case of wavelength converter and a finite number of wavelengths , the algorithm is able to dynamically adjust the route selection policy , in order to efficient use of bandwidth resources . The paper first briefly wavelength routing algorithm , and then gives the the DPSK system bit error rate (BER) calculation method , followed by several common RWA algorithm improvements , then presents a dynamic optical network associated with the underlying physical quantities wavelength routing algorithm . Finally, the simulation verify the feasibility and superiority of the algorithm , compared with the commonly used algorithms , this algorithm significantly reduces the network call blocking rate , network performance optimization .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications
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