In this paper, we study the performance of dynamic routing and wavelengthassignment (RWA) in filterless optical networks. These types of broadcast and select networks benefit from breakthroughs in advanced transmissi...
详细信息
In this paper, we study the performance of dynamic routing and wavelengthassignment (RWA) in filterless optical networks. These types of broadcast and select networks benefit from breakthroughs in advanced transmission technologies for replacing optical filters and active photonic switching devices, such as wavelength selective switches, with passive optical interconnections between nodes, creating passive optical light trees. We introduce an RWA scheme for establishing passive optical lightpaths in a filterless context and managing unfiltered channels at intermediate egress nodes, which, by propagating downstream of the terminating nodes, participate in wavelength usage and increase the risk of wavelength exhaustion. Simulation results are presented for six network topologies, along with the performance evaluation of active photonic and filterless optical network solutions with static and dynamic RWA schemes. We show that the performance of the proposed scheme depends on the average degree of node connectivity.
In this paper, the filterless optical network concept is presented and explored through a number of filterless solution examples. In the first part, the filterless network concept is presented and analyzed through a c...
详细信息
In this paper, the filterless optical network concept is presented and explored through a number of filterless solution examples. In the first part, the filterless network concept is presented and analyzed through a comparative case study. In the second part, the filterless network design problem is defined and a filterless network design tool based on metaheuristics is presented. In the third part of this presentation, filterless network solutions are proposed for a number of core network topologies and compared to active photonic network solutions from the point of view of cost and performance. The results show that cost-effective filterless solutions can be found for different network sizes and topologies. The results of a comparative study show that filterless networks represent a cost-effective and reliable alternative to active optical switching network solutions.
Network blocking performance due to wavelength continuity constraint in a well-connected all-optical network can be efficiently reduced by utilizing wavelength converters. Nevertheless, the introduction of high bit ra...
详细信息
Network blocking performance due to wavelength continuity constraint in a well-connected all-optical network can be efficiently reduced by utilizing wavelength converters. Nevertheless, the introduction of high bit rate optical services with strict tolerance to signal quality would have a serious impact on the overall network performance since in this circumstance, a request can be blocked due to unacceptable signal quality of potential routes. Chromatic dispersion tolerance, for example, is reduced by the square of the bit rate. By extending the typical application of parametric wavelength converter in solving a wavelength continuity problem, this paper aims to enhance chromatic dispersion management through an improved wavelength conversion algorithm. Consequently, significant improvement in network performance has been demonstrated through reduction in the dispersion effect when the proposed engineering rule is included in the conversion process.
Recent advances in coherent detection and digital signal processing (DSP) technologies have stimulated the exploration of novel agile architectures for WDM core networks. Filterless optical networks are passive broadc...
详细信息
ISBN:
(纸本)9781457708800
Recent advances in coherent detection and digital signal processing (DSP) technologies have stimulated the exploration of novel agile architectures for WDM core networks. Filterless optical networks are passive broadcast & select networks in which the need for agility is delivered by DSP-assisted tunable transceivers, and simple passive splitters/combiners are used for interconnecting the fiber links. The resulting network architecture is expected to bring about significant advantages, such as reduced installed first cost (IFC) of the network, ease of maintenance, and reconfigurability, as well as good resilience and multicast capabilities. In this paper, the filterless network design problem is defined for a wide area network (WAN), and a method based on genetic and Tabu search algorithms is proposed for designing long haul (LH) filterless networks based on the concept of "filterless islands". Filterless network solutions are then proposed for a number of core network topologies, and the main characteristics of the solutions are presented. Our results show that filterless solutions can be found for different WAN topologies and confirm that the filterless networking concept is applicable to optical core networks.
Filterless optical networks based on advanced transmission technologies and passive optical interconnections between nodes offer a lower-cost alternative to optical networks based on active photonic switching. A desig...
详细信息
Filterless optical networks based on advanced transmission technologies and passive optical interconnections between nodes offer a lower-cost alternative to optical networks based on active photonic switching. A design and simulation platform is proposed for studying these novel network architectures and looking at their performance characteristics. Simulation results are presented for three reference network topologies, along with a comparative cost and performance study of active photonic and passive filterless optical network solutions.
This paper focuses on survivable optical networks and studies in detail the network performance improvement that can be achieved when jointly considering network resilience and physical layer constraints. The protecti...
详细信息
ISBN:
(纸本)9781424448258
This paper focuses on survivable optical networks and studies in detail the network performance improvement that can be achieved when jointly considering network resilience and physical layer constraints. The protection scheme used is path-based shared protection known as backup multiplexing. In the proposed solution routing and wavelengthassignment for both primary and protection paths are jointly performed considering their physical performance. Simulations comparing the proposed solution with alternative schemes aiming at maximising sharing of protection resources have shown substantial network performance improvement in terms of blocking probability reduction when jointly addressing resilience and physical layer performance requirements.
暂无评论