Abstract

As routing tables in core Internet routers grow to exceed 100000 entries, it is becoming essential to develop methods to reduce the lookup time required to forward packets toward their destinations. In this paper, we employ a bank of novel thermally tuned fiber-Bragg-grating-based optical correlators to construct an"optical bypass"to accelerate conventional electronic Internet routers. The correlators are configured as a routing table cache that can quickly determine the destination port for a fraction of the incoming traffic by examining only a subset of the bits in an IP packet's 32-bit destination address. We also demonstrate a novel multiwavelength correlator based on fiber Bragg grating that can simultaneously recognize the header bits on multiple wavelengths for use in wavelength-division-multiplexed (WDM) systems. Using the optical bypass, routing table lookup times are reduced by an order of magnitude from microseconds to nanoseconds and are limited only by the speed of the optical switch.

© 2003 IEEE

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J. Lightwave Technol. (1)

Other (14)

T. Erdogan, "Fiber grating spectra", J. Lightwave Technol. , vol. 15, pp. 1277-1294, Aug. 1997.

E. R. Lyons, "Tunable all-fiber devices for optical fiber communications", Ph.D. dissertation, Univ. of California, Irvine, 2001.

J. A. Rogers, P. Kuo, A. Ahuja, B. J. Eggleton and R. J. Jackman, "Characteristics of heat flow in optical fiber devices that use integrated thin-film heaters", Appl. Opt. , vol. 39, pp. 5109-5116, Oct. 2000.

P. Mehrotra and P. D. Franzon, "Novel hardware architecture for fast address lookups", IEEE Commun. Mag., pp. 66-71, Nov. 2002.

J. Bannister, J. Touch, P. Kamath and A. Patel, "An optical booster for internet routers", in Proc. 8th Int. Conf. High Performance Computing, Hyderabad, India,Dec. 2001, pp. 339- 413.

J.-D. Shin, M.-Y. Jeon and C.-S. Kang, "Fiber-optic matched filters with metal films deposited on fiber delay-line ends for optical packet address detection", IEEE Photon. Technol. Lett., vol. 8, pp. 941-943, July 1996.

D. B. Hunter and R. A. Minasian, "Programmable high-speed optical code recognition using fiber Bragg grating arrays", Electron. Lett., vol. 35, pp. 412-414, Mar. 1999.

J. E. McGeehan, S. Kumar, J. Bannister, J. Touch and A. E. Willner, "Optical time-to-live decrementing and subsequent dropping of an optical packet", in Proc. Opt. Fiber Commun. Conf., Mar. 2003, FS6.

A. Othonos and K. Kalli, Fiber Bragg Gratings: Fundamentals and Applications in Telecommunications and Sensing, Boston, MA: Artech House, 1999, p. 99.

R. Kashyap, Fiber Bragg Gratings, San Diego, CA: Academic, 1999, pp. 436-440.

M. C. Cardakli and A. E. Willner, "Synchronization of a network element for optical packet switching using optical correlators and wavelength shifting", IEEE Photon. Technol. Lett., vol. 14, pp. 1375 -1377, Sept. 2002.

L. Li, J. Geng, L. Zhao, G. Chen, G. Chen, Z. Fang and C. F. Lam, "Response characteristics of thin-film-heated tunable fiber Bragg gratings", IEEE Photon. Technol. Lett., vol. 15, pp. 545-547, Apr. 2003.

M. Ibsen, M. K. Durkin, M. J. Cole and R. I. Laming, "Sinc-sampled fiber Bragg gratings for identical multiple wavelength operation", IEEE Photon. Technol. Lett., vol. 10, pp. 842-844, June 1998.

N. Yusuki and Y. Shinji, "Realization of various superstructure fiber Bragg gratings for DWDM systems using multiple-phase-shift technique", in Proc. Opt. Fiber Commun. Conf., Mar. 2002, TuQ3.

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