Abstract
All-optical networks (AON) assured a large bandwidth, high-speed switching, and QoS (Quality of Service) support. But due to the development of applications and services, new requirements are created in terms of, specifically resource utilization and QoS provision. To meet these demands, AON enabled core node architecture with multiple wavelength converters’ types involving full range wavelength converter (FRWC) having a significant cost. To reduce the cost, a hybrid AON with composite node architecture combining wavelength converters (WC), Fiber delay line (FDL), and wavelength range (WR) are introduced. In this architecture, fixed and limited wavelength converters (FXWC, LRWC) are utilized while the FRWC converter is replaced by FDL. The proposed architecture decreased the presence and usage of WC, FDL, and WR while assuring QoS support. A lightpath cost formulation is computed based on WR, WC, and FDL enabled in the proposed node architecture to decrease converter and FDL numbers. The cost also managed the wavelength availability to ensure lightpath control and QoS support using real-time requirements, especially loss and blocking delay. The obtained results in the comparative study, conducted in the simulation work, showed that the novel approach performed better than the existing approaches. Moreover, our proposal optimized AON resources, particularly node architecture design, while providing QoS support according to the traffic parameters and requirements.
Highlights
Due to Internet growth, a tremendous demand for a large bandwidth is created for providing the requirements of advanced applications and services
Fixed and limited wavelength converters (WC), FXRC and LRWC, are employed, due to its high cost full range wavelength converter (FRWC) is substituted by Fiber delay line (FDL)
This node architecture is designed based on dynamic topology for optimizing wavelength bandwidth, WC, and FDL usage while guaranteeing quality of service (QoS) support
Summary
Due to Internet growth, a tremendous demand for a large bandwidth is created for providing the requirements of advanced applications and services. Al-Zahrani: Joint Hybrid Wavelength Conversion and Fiber Delay Line To overcome these limits, OLS appears as a promising technology where a transparent traffic transfer, mixed control, and data planes are utilized. To improve network performance, core node and link cost are considered the principal issue of these technologies, in OLS Another issue consists of QoS satisfaction for data traffic with variable parameters and constraints. The introduced node architecture should supervise the mentioned mechanisms to manage and perform suitably the lightpath establishment and utilization In this case, the established lightpath is created employing real-time network status and incoming traffic demands. The network resource status is controlled based on link availability, including available wavelength bandwidth and node accessibility covering input and output ports, converter, and FDL With these improvements, the proposed architecture can operate network resource status and traffic constraints.
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