A novel delay line buffering architecture for asynchronous optical packet switched networks

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Shuna Yang
Norvald Stol


delay-line optical buffer, optical packet switch, Markov model, fiber delay line (FDL), packet loss ratio (PLR)


Optical buffering is one major challenge in realizing all-optical packet switching. In this paper we focus on a delay-line buffer architecture, named a Multiple-Input Single-Output (MISO) optical buffer, which is realized by cascaded fiber delay lines (FDLs). This architecture reduces the physical size of a buffer by up to an order of magnitude or more by allowing reuse of its delay line elements. We consider the MISO buffers in a network scenario where the incoming packets are asynchronous and of fixed length. A novel Markov model is developed to analyze the performance of our buffering scheme, in terms of packet loss ratio, average packet delay and the output link utilization. Both simulation and analytical results show that the length value of basic FDL element will significantly affect the performance of this buffer. This paper gives clear guidelines for designing optimal basic FDL lengths under different network scenarios. It is noticeable that this optimal length value is independent of the buffer sizes for specific traffic load and pattern.


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M. J. Mahony, D. Simenonidou, and D. K. Hunter, (2001), “The application of Optical Packet Switching in Future Communication Networks,” IEEE Communications Magazine, vol. 39, pp. 128-135, Mar. 2001.

D. K. Hunter, M. C. Chia and I. Andonovic, (2003), “Buffering in optical packet switches,” Journal of Lightwave Technology, vol. 21, no. 2, pp. 384-405, Feb. 2003.

A. Pasquazi, R. Ahmad, M. Rochette, (2010), “All-optical wavelength conversion in an integrated ring resonator,” Optics Express, vol. 18, pp. 3858-3863, Feb. 2010.

G. Castanon, “Design-dimensioning model for transparent WDM packet-switched irregular networks,” Journal of Lightwave Technology, vol. 20, no. 01, Jan. 2002.

E. F. Burmeister, D. J. Blumenthal and J. E. Bowers, (2007), “A comparison of optical buffering technologies,” Optical Switching and Networking, vol. 01, pp. 1-9, Jul. 2007.

X. Zhu and J. M. Khan, (2003), “Queuing models of optical delay lines in synchronous and asynchronous optical packet-switching networks,” Optical Engineering, no. 42, vol. 6, pp. 1741-1748, 2003.

T. Zhang, K. Lu and J. P. Jue, (2006), “Shared fiber delay line buffers in asynchronous optical packet switches,” IEEE Journal on Selected Areas in Communications, vol. 24, no. 4, April 2006.

T. Zhang, K. Lu and J. P. Jue, (2004), “Differentiated contention resolution for Qos in photonic packet-switched networks,” in Proceeding of IEEE ICC, pp. 1599-1603, 2004.

G. Das, R. S. Tucker, C. Leckie and K. Hinton, (2008), “Multiple-input single-output FIFO optical buffers with controllable fractional delay lines,” Optics Express, vol. 16, no. 26, pp. 21849-21864, Dec. 2008.

S. Yang, N. Stol, (2013), “Architecture, performance and cost analysis of an optical packet switch with input concentrators,” in Proceeding of 2nd IEEE/CIC International Conference on Communications in China, pp. 183-188, 2013.

W. Rogiest, K. Laevens, S. Wittevrongel and H. Bruneel, (2013), “Heuristic performance model of optical buffers for variable length packets,” Photonic Network Communications, vol. 26, no. 2, pp. 65-73, Dec. 2013.

L. Tancevski, A. Ge, G. Castanon and L. Tamil, (1999), “A new scheduling algorithm for asynchronous, Variable length IP traffic incorporationg void filling,” Proc. Of Optical Fiber Communication Conference – OFC, Feb. 1999.

L. Tancevski, S. Yegnanarayanan, G. Castanon, L. Tamil, F. Masetti and T. McDermott, (2000), “Optical routing of asynchronous, Variable length packets,” IEEE Journal on Selected Areas in Communications, vol. 18, no. 10, Oct. 2000.

J. Cao, W. Cleveland, D. Lin and D. Sun, (2002), “Internet traffic tends toward Poisson and independent as the load increases,” in Nonlinear Estimation and Classification (Springer, New York 2002).

J. Cao, W. Cleveland, D. Lin and D. Sun, (2002), “The effect of statistical multiplexing on the long range dependence of internet packet traffic,” Bell Labs Tech. Reports (2002).

G. Birtwistle, (2003), Demos-a system for Discrete Event Modeling on Simula, University of Sheffield, England S1 4DP, Jan. 2003.