Abstract

With the advent of very high-bit-rate optical communication systems (40 Gb/s and beyond) and the progressive transformation of the optical layer in a real networking layer, a channel-by-channel adaptive optical equalization will be needed. An adaptive optical equalizer for chromatic dispersion compensation,based on planar lightwave circuit (PLC) technology and controlled by a minimum mean square error (MSE) strategy, is proposed here. It is shown in a rigorous manner how the PLC parameters are to be adjusted and that the control algorithm is effective even with a few stages PLC equalizer, performing better than other nonadaptive control techniques. An analysis of the dynamic behavior of the equalizer shows that, in a realistic time-varying scenario, it can easily adapt to slow channel variations and is able to quickly restore a minimum MSE condition after an abrupt chromatic dispersion variation.

© 2003 IEEE

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J. Lightwave Technol. (6)

F. Ouellette, J.-F. Cliche and S. Gagnon, "All-fiber devices for chromatic dispersion compensation based on chirped distributed resonant coupling", J. Lightwave Technol., vol. 12, pp. 1728-1738, Oct. 1994 .

N. M. Litchinister and D. P. Patterson, "Analysis of fiber bragg gratings for dispersion compensation in reflective and transmissive geometries", J. Lightwave Technol., vol. 15, pp. 1323-1328, Aug. 1997 .

E. Forestieri and G. Prati, "Novel optical line codes tolerant to fiber chromatic dispersion", J. Lightwave Technol., vol. 19, pp. 1675-1684, Nov. 2001.

J. H. Winters, "Equalization in coherent lightwave systems using a fractionally spaced equalizer", J. Lightwave Technol., vol. 8, pp. 1487-1491, Oct. 1990 .

K. Jinguji, "Synthesis of coherent two-port lattice-form optical delay-line circuit", J. Lightwave Technol., vol. 13, pp. 73-82, Jan. 1995.

E. Forestieri, "Evaluating the error probability in lightwave systems with chromatic dispersion, arbitrary pulse shape and pre-and postdetection filtering", J. Lightwave Technol., vol. 18, pp. 1493-1503, Nov. 2000 .

Other (14)

A. F. Elrefaie, R. E. Wagner, D. A. Atlas and D. G. Daut, "Chromatic dispersion limitations in coherent lightwave transmission systems", J. Lightwave Technol. , vol. 6, pp. 704-709, May 1988.

G. P. Agrawal, Fiber-Optic Communication Systems , New York: Wiley, 1997.

S. Benedetto, E. Biglieri and V. Castellani, Digital Transmission Theory, London: U.K.: Prentice-Hall, 1987.

S. W. Golomb, Shift Register Sequences, San Francisco, CA: Holden-Day, 1967.

D. Marquardt, "An algorithm for least squares estimation of non linear parameters", J. Soc. Ind. Appl. Math., 1963.

P. J. M. Van Laarhoven and E. H. L. Aarts, Simulated Annealing:Theory and Applications, Dordrecht: Holland: Reidel, 1987.

A. Banerjee, J. Drake, J. P. Lang, B. Turner, K. K. ompella and Y. Rekhter, "Generalized multiprotocol label switching: An overview of routing and management enhancements", IEEE Commun. Mag. , vol. 39, pp. 144-150, Jan. 2001.

R. Ramaswami, "Optical fiber communication: From transmission to networking", IEEE Commun. Mag., pp. 138-147, May 2002.

M. Secondini, E. Forestieri and G. Prati, "Performance of mse configured plc optical equalizer for chromatic dispersion compensation", IEEE Photon. Technol. Lett., vol. 15, pp. 248-250, Feb. 2003.

M. Bohn, G. Mohs, C. Scheerer, C. Glingener, C. Wree and W. Rosenkranz, "An adaptive optical equalizer concept for single channel distortion compensation", in Proc. ECOC'01, vol. 1, 2001, pp. 6-7.

A. Himeno, K. Kato and T. Miya, "Silica-based planar lightwave circuits", J. Select. Quantum Electron., vol. 4, pp. 913-924, Nov. 1998.

K. Takiguci, K. Okamoto and K. Moriwaki, "Dispersion compensation using a planar lightwave circuit optical equalizer", IEEE Photon. Technol. Lett., vol. 6, pp. 561 -564, Apr. 1994.

S. Kuwano, K. Yonenaga and K. Iwashita, "10 Gbit/s repetearless transmission experiment of optical duobinary modulated signal", Electron. Lett., vol. 31, no. 16, pp. 1359-1361, 1995.

K. Yonenaga and S. Kuwano, "Dispersion-tolerant optical transmission system using duobinary transmitter and binary receiver", J. Lightwave Technol. , vol. 15, pp. 1530-1537, Aug. 1997.

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