A design method is proposed that minimizes the deployment cost of a network when only a limited number of OXCs is capable of 3-R regeneration. Optimization, based on a given static-traffic matrix, is carried out by routing lightpaths with constrained signal degradation. Constraint-based routing and wavelength assignment is performed considering accumulation of noise due to amplified spontaneous emission of optical amplifiers as the major cause of signal degradation. A general multilayer design and optimization procedure is developed and applied to some case-study networks. The effects of the variation of design parameters such as amplification-span length, wavelength conversion capability distribution and optical protection capability is investigated.
We present a new approach to WDM multifiber network design and optimization under static traffic aimed to minimize the number of fibers in the network. The heuristic optimization comprises an initial setup of all the demanded lightpaths and an iteration during which the network is progressively improved by rerouting lightpaths and consequently eliminating fibers with a high number of unused wavelengths. In our approach static traffic is actually managed with the same techniques as dynamic traffic by suitably sorting the static connection demands and offering them in sequence to the network. The employment of the multifiber layered graph as a template to represent the network states allows to compare a very wide range of routing, fiber and wavelength assignment criteria, link metrics, wavelength-conversion environments and so on. In this paper we will show and discuss the optimization of a particular case-study network and we will analyze the influence of various design parameters on the final results.
For the future development of residential broadband telecommunication services the present access infrastructure must be upgraded. Fiber-To-The-Home (FTTH) optical networks, though still expensive today, appear to be a future-proof solution. FTTH networks based on passive optical Remote Nodes (RN) and supporting ATM switching (ATM-PONs) have been demonstrated and are going to be standardized. In these networks the optical hardware in the RN is very simple, but a multiple access protocol is needed for upstream traffic control. In most protocols proposed in literature the control is performed electronically in a centralized way by the Central Office. In this paper we study multiple access schemes for FTTH networks which perform upstream traffic control in a distributed way with the intervention of the user Optical Network Terminations (ONTs) and of the RN only. We will also consider the case, based on recent research in photonic packet switching, in which the RN is able to perform all-optical ATM-multiplexing. We will employ ONT-RN signalling to make the relatively expensive RN optical buffer co-operate with the electronic buffers located in the ONTs. The different solutions presented will be compared by simulating the network behavior under various traffic conditions. In conclusion, in this work we evaluate performance advantages achievable in FTTH networks by increasing the optical complexity of the RN and by introducing control schemes which allow a distributed upstream traffic management and, in the case of an RN able to perform all-optical ATM-multiplexing, the co-operation of the RN buffer with the ONT buffers.
Header Error Control in all-optical ATM switching nodes is discussed. An architecture of an error detection subsystem is designed suitable for free-space parallel optical implementation.
Conference Committee Involvement (3)
Optical Transmission, Switching, and Subsystems III
7 November 2005 | Shanghai, China
Optical Transmission, Switching, and Subsystems II
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