Architecture, design, and modeling of the OPSnet asynchronous optical packet switching node

Vanderbauwhede, Wim; Harle, D.A.

doi:10.1109/jlt.2005.850023

Cited by 16 publications

(9 citation statements)

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“…Most of current literature on OPS is based on synchronous switching [3] whereas asynchronous OBS is the most dominant mode of OBS operation [2]. However, exceptions exist in the literature; see [4], [5]. The current article focuses on asynchronous OPRs only and the use of FDL buffers in overcoming the performance limitations of asynchronous switching systems.…”

Section: Introductionmentioning

confidence: 99%

Retrial Queuing Models of Multi-Wavelength FDL Feedback Optical Buffers

Akar

Sohraby

2011

IEEE Trans. Commun.

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Abstract-Optical buffers based on Fiber Delay Lines (FDL) have been proposed for contention resolution in optical packet/burst switching systems. In this article, we propose a retrial queuing model for FDL optical buffers in asynchronous optical switching nodes. In the considered system, the reservation model employed is of post-reservation type and optical packets are allowed to re-circulate over the FDLs in a probabilistic manner. We combine the MMPP-based overflow traffic models of the classical circuit switching literature and fixed-point iterations to devise an algorithmic procedure to accurately estimate blocking probabilities as a function of various buffer parameters in the system when packet arrivals are Poisson and packet lengths are exponentially distributed. The proposed algorithm is both accurate and fast, allowing one to use the procedure to dimension optical buffers in next-generation optical packet switching systems.Index Terms-Fiber Delay Line (FDL) re-circulation buffer, optical packet switching, optical burst switching, Markov modulated Poisson process, retrial queues.

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Section: Introductionmentioning

confidence: 99%

Retrial Queuing Models of Multi-Wavelength FDL Feedback Optical Buffers

Akar

Sohraby

2011

IEEE Trans. Commun.

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“…For all-optical packet switching, optical buffering implemented by fiber delay lines (FDLs) [2,[6][7][8][9][11][12][13][14]17,19,20,[24][25][26]28,29] is a solution to the output contention problem. Optical packets can be recirculated in FDLs to avoid output contention.…”

Section: Introductionmentioning

confidence: 99%

A latency-aware scheduling algorithm for all-optical packet switching networks with FDL buffers

Chou

Lin

2010

Photon Netw Commun

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Optical buffers implemented by fiber delay lines (FDLs) have a volatile nature due to signal loss and noise accumulation. Packets suffer from excessive recirculation through FDLs, and they may be dropped eventually in their routing paths. Because of this, packet scheduling becomes more difficult in FDL buffers than in RAM buffers, and requires additional design considerations for reducing packet loss. We propose a latency-aware scheduling scheme and an analytical model for all-optical packet switching networks with FDL buffers. The latency-aware scheduling scheme is intended to minimize the packet loss rate of the networks by ranking packets in the optimal balance between latency and residual distance. The analytical model is based on non-homogeneous Markovian analysis to study the effect of the proposed scheduling scheme on packet loss rate and average delay. Furthermore, our numerical results show how various network parameters affect the optimal balance. We demonstrate quantitatively how to achieve the proper balance between latency and residual distance so that the network performance can be improved significantly. For instance, we find that under a given latency limit and light traffic load our scheduling scheme achieves a packet loss rate 71% lower than a scheduling scheme that ranks packets simply based on latency

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“…The basic motivation of this work is that complex scheduling algorithms are not applicable because of the peculiarity of queues in the optical domain, which usually provide a very limited queuing space being implemented by means of delay lines that do not allow random access [4]. This means that traditional priority-based queuing strategies are not feasible in OPS/OBS networks, and QoS differentiation can be achieved mainly by means of resource partitioning strategies in the time and wavelength domains, as shown in previous works [5][6][7][8] which refer to QoS management at the switching node level. Other opportunities arise when considering the routing decisions.…”

Section: Introductionmentioning

confidence: 99%