Benchmarking and Viability Assessment of Optical Packet Switching for Metro Networks

Abstract

Optical packet switching (OPS) has been proposed as a strong candidate for future metro networks. This paper assesses the viability of an OPS-based ring architecture as proposed within the research project DAVID (Data And Voice Integration on DWDM), funded by the European Commission through the Information Society Technologies (IST) framework. Its feasibility is discussed from a physical-layer point of view, and its limitations in size are explored. Through dimensioning studies, we show that the proposed OPS architecture is competitive with respect to alternative metropolitan area network (MAN) approaches, including synchronous digital hierarchy, resilient packet rings (RPR), and star-based Ethernet. Finally, the proposed OPS architectures are discussed from a logical performance point of view, and a high-quality scheduling algorithm to control the packet-switching operations in the rings is explained. Index Terms-Optical packet switching, wavelength-division multiplexing, metropolitan area networks (MANs), performance, medium access control (MAC). I. INTRODUCTION D ESPITE the recent economic malaise, the demand for telecommunication services continues to grow steadily. Even though this growth may have been overenthusiastically acclaimed (leading to the creation and explosion of the "bubble"), it cannot be denied that telecommunication networks are at the Manuscript

Two efficient packet aggregation mechanisms and QoS support in a slotted dual bus optical ring network

“…{N optimal > N 0 AND τ optimal = τ 0 } OR {N optimal = N 0 AND τ optimal < τ 0 }). In the latter case, constraint D th 0 is always satisfied (since the threshold D th = τ optimal ≤ τ 0 = D th 0 is obtained) while constraint F th 0 is not verified since (32) implies that the filling ratio obtained is F th < F th 0 . In other words, (N optimal , τ optimal ) always fulfills the delay constraint D th 0 fixed at the beginning of the algorithm, but leads to a filling ratio less than the desired F th 0 if N optimal > N 0 or τ optimal < τ 0 .…”

“…This is in perfect conformity with the notion of all-optical (or transparent) networks in the literature (the reader is referred to [20,31]). Also, this concept is widely used in the literature (e.g., [33,32,7,9]). At the upstream bus, ring nodes detect the header to determine the reservation status of the slot, while the hub must know whether some packets aggregated into the optical payload are destined to the backbone or not.…”

Facing the traffic explosion in metro transport networks with energy-sustainable architectures

“…Afterwards, several studies introduced solutions based on optical burst/packet switched metro networks. Most of these studies proposed solutions for ring metro networks as the architectures described in [2,4,15,16] or as the ones referred in [6,10]. Few other studies introduced solutions for meshed metro networks [23,24].…”

Migration Strategies Toward All Optical Metropolitan Access Rings

“…• Transceivers: The total number and capacity of transmitter /receiver (Tx/Rx) elements has a strong impact on final CAPEX and OPEX requirements [17], [18], [19].…”