Joint Hybrid Wavelength Conversion and Fiber Delay Line for All-Optical Core Node Modeling and Optimization Using Dynamic QoS Support

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 realtime 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.

Joint resource optimization and flexible QoS provision using hybrid optical core node architecture

“…The experimentation is designed using the MATLAB tool that provides random generators performing the well-known generator of pseudo-random uniformly distributed numbers’ RAND. This generator belongs to a class of multiplicative linear congruential pseudo-random numbers of generators [ 8 , 10 ]. That tool also provides the capability to build and manage the traffic load and types as arrays describing its parameters and requirements.…”

“…However, AON encounters several issues during implementation and configuration under flexible restrictions, where the traffic behavior changes during the transmission depending on the status of performance metrics. The present node architectures performed suitable mechanisms, mainly QoS support handling available resources according to static and dynamic behavior [ 9 , 10 ]. With the appearance of traffic with flexible constraints, these architectures cannot enable hybrid functions, ensuring the balance between fundamental mechanisms and the cost of physical modifications, configuration, and supervision.…”

“…Then, all hybrid core nodes perform the enhanced flexible QoS approach along the chosen lightpath to reduce resource usage according to multiple traffic constraints. The AON resource is reserved and employed based on shared traffic parameters support comprising needed and real-time parameters, mainly loss and blocking delay, as presented and discussed in our previous work [ 9 , 10 ]. Interested readers can find more information and explanations of the implementation phase and mechanisms enabling these schemes [ 9 , 10 ].…”

“…(8) provide the WC and FDL availabilities in the set of hybrid core nodes (say L) of the potential lightpaths. These availabilities are developed and analyzed in detail in our previous works [ 9 , 10 ], where the reader finds a complete description of the different components and steps of the needed probabilities formulation. These probabilities depend on the hybrid core node and wavelength range in the concerned link.…”

“…Also, the node architecture requires exchanging the needed data along the potential lightpaths involving link and wavelength bandwidth availabilities. Two core node architectures are utilized employing the implementation and management of different types of WC and FDL [ 9 , 10 ]. These node architectures perform signaling, switching, and QoS support mechanisms to handle available resources according to fixed and dynamic traffic behavior.…”