Combined Input and Output All-Optical Variable Buffered Switch ...

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Combined Input and Output All-Optical Variable Buffered Switch ...

1294 IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 17, NO. 6, JUNE 2005indicate that the combined input single-stage all-optical buffercomponent and output multistage wavelength-selective bufferarrays may effectively reduce the packet loss rate and increasethe switch throughput.2) Packet Buffering Delay and Jitter Analysis: Fig. 4(b) and(c) demonstrates that CIOQ-OPS achieves shorter bufferinglatency and smaller jitter compared to IQ-OPS under thegiven buffer capacity values. This indicates that CIOQ-OPSeffectively improves the performance of IQ-OPS in terms ofthe buffering latency and jitter by reducing the HOL blockingeffect and shaping the incoming bursty traffic.V. CONCLUSIONThis letter has presented a new OPS architecture incorporatingthe combined input single-stage and output multistageall-optical variable buffers. The simulation results indicate thenewly proposed OPS architecture achieves much lower packetloss rate under the optimized input–output buffer size allocationat a high traffic load. The performance improvement is typicallyby one or two orders of magnitude compared to the previousOPS architectures with all-optical variable delay buffers with areasonable optical buffer size ( 1000 B).Fig. 4.(a) Packet loss rate, (b) buffering latency, and (c) buffering jitter.B. Performance Evaluation1) Packet Loss Rate Analysis: Fig. 4(a) shows that, for abuffer partition ratio of 0.5 and total buffer capacity of 1000 B,CIOQ-OPS achieves the lowest packet loss rate (3.4E-5)when compared with both the IQ-OPS (4.4E-3) and OQ-OPS(1.20E-2). This value is orders of magnitude lower than the 0-Bcase with no variable optical buffer, indicating the effectivenessof all optical variable buffers. The CIOQ-OPS packet loss ratedrops more rapidly as the total buffer capacity increases to1000 B. The packet loss rate simulation results of Fig. 4(a)REFERENCES[1] S. Yao, B. Mukherjee, S. J. B. Yoo, and S. Dixit, “All-optical packetswitchingfor metropolitan area networks: Opportunities and challenges,”IEEE Commun. Mag., vol. 39, no. 3, pp. 142–148, Mar. 2001.[2] A. V. Turukhin, V. S. Sudarshanam, M. S. Shahriar, J. A. Musser, B.S. Ham, and P. R. Hemmer, “Observation of ultraslow and stored lightpulses in a solid,” Phys. Rev. Lett., vol. 88, no. 2, p. 023602, 2002.[3] P. C. Ku, C. J. Chang-Hasnain, and S. L. Chuang, “Variable semiconductorall-optical buffers,” Electron. Lett., vol. 38, no. 24, pp.1581–1583, Nov. 2002.[4] P. C. Ku, C. J. Chang-Hasnain, J. Kim, and S. L. Chuang, “Semiconductorall-optical buffers using quantum dots in resonator structures,” inProc. IEEE/OSA Optical Fiber Communication Conf. (OFC 2003) , Atlanta,GA, 2003.[5] H. Yang and S. J. B. Yoo, “A new optical switching fabric architecture incorporatingrapidly switchable all-optical variable delay buffer,” in Proc.IEEE/OSA Optical Fiber Communication Conf. (OFC 2004), Los Angeles,CA, 2004, Paper ThV2.[6] , “New optical switching fabric architecture incorporating load balancedparallel rapidly switching all-optical variable delay buffer arrays,”in Proc. IEEE/OSA Optical Fiber Communication Conf. (OFC 2005),Anaheim, CA, 2005, Paper OME75.[7] L. Wosinska, J. Haralson, L. Thylén, J. Öberg, and B. Hessmo, “Benefitof implementing novel optical buffers in an asynchronous photonicpacket switch,” in Proc. Eur. Conf. Optical Communication (ECOC2004), Stockholm, Sweden, 2004, Paper Th2.6.5.[8] S. J. B. Yoo, H. J. Lee, Z. Pan, J. Cao, Y. Zhang, K. Okamoto, and S.Kamei, “Rapidly switching all-optical packet routing system with optical-labelswapping incorporating tunable wavelength sonversion anda uniform-loss cyclic frequency AWGR,” IEEE Photon. Technol. Lett.,vol. 14, no. 8, pp. 1211–3, Aug. 2002.[9] M. Hlunchyj and M. Karol, “Queueing in high-performance packetswitch,” IEEE J. Sel. Areas Commun., vol. 6, no. 12, pp. 1587–1597,Dec. 1988.

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