Abstract

This paper discusses design, simulation, and experimental investigations of optical-code-division multiple-access (O-CDMA) networking using a spectral phase-encoded time spreading (SPECTS) method. O-CDMA technologies can potentially provide flexible access of optical bandwidths in excess of 1Tb/s without relying on wavelength-or time-division-multiplexing modules, provided that they overcome the interference caused by other users broadcasting over the same channel, called multiuser interference (MUI). This paper pursues theoretical and experimental methods to mitigate the MUI. Analysis shows that nonuniform phase coding can increase the orthogonality of the code set, thereby reducing the impact of the MUI. The experiment conducted in a SPECTS O-CDMA testbed incorporating a highly nonlinear thresholder demonstrated error-free operation for four users at 1.25-Gb/s/user and for two users at 10-Gb/s/user.

© 2004 IEEE

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J. Lightwave Technol. (5)

P. R. Prucnal, M. A. Santoro and T. R. Fan, "Spread spectrum fiber-optic local area network using optical processing", J. Lightwave Technol., vol. 4, pp. 547-554, May 1986.

M. E. Marhic, "Coherent optical CDMA networks", J. Lightwave Technol., vol. 11, pp. 854-863, May 1993.

Z. Wei, H. M. H. Shalaby and H. Ghafouri-Shiraz, "Modified quadratic congruence codes for fiber Bragg-grating-based spectral-amplitude-coding optical CDMA systems", J. Lightwave Technol., vol. 19, pp. 1274-1281, Sept. 2001.

H. P. Sardesai, C.-C. Chang and A. M. Weiner, "A femtosecond code-division multiple-access communication system test bed", J. Lightwave Technol., vol. 16, pp. 1953-1964, Nov. 1998.

J. A. Salehi, A. M. Weiner and J. P. Heritage, "Coherent ultrashort light pulse code-division multiple access communication systems", J. Lightwave Technol., vol. 8, pp. 478-491, Mar. 1990.

Opt. Lett. (2)

Other (14)

H. Tsuda, H. Takenouchi, T. Ishii, K. Okamoto, T. Goh, K. Sato, A. Hirano, T. Kurokawa and C. Amano, "Spectral encoding and decoding of 10 Gbit/s femtosecond pulses using high resolution arrayed-waveguide grating", Electron. Lett., vol. 35, pp. 1186-1188, July 1999.

R. M. H. Yim, L. R. Chen and J. Bajcsy, "Design and performance of 2-D codes for wavelength-time optical CDMA", IEEE Photon. Technol. Lett., vol. 14, pp. 714-716, May 2002.

A. J. Mendez, R. M. Gagliardi, V. J. Hernandez, C. V. Bennett and W. J. Lennon, "Design and performance analysis of wavelength time (W/T) matrix codes for optical CDMA", J. Lightwave Technol. , vol. 21, pp. 2524-2533, Nov. 2003.

L. Tancevski and I. Andonovic, "Wavelength hopping/time spreading code division multiple access systems", Electron. Lett., vol. 30, pp. 1388-1390, Aug. 1994.

G.-C. Yang and W. C. Kwong, "A new class of carrier-hopping codes for code-division multiple-access optical and wireless systems", IEEE Commun. Lett., vol. 8, pp. 51-53, Jan. 2004.

M. Kavehrad and D. Zaccarin, "Optical code-division-multiplixed systems based on spectral encoding of noncoherent sources", J. Lightwave Technol. , vol. 13, pp. 534-545, Mar. 1995.

A. M. Weiner, "Femtosecond pulse shaping using spatial light modulators", Rev. Sci. Instrum., vol. 71, pp. 1929-1960, May 2002.

N. Karafolas, "Optical fiber code division multiple access networks: a review", Opt. Fiber Technol., vol. 2, pp. 149-168, 1996.

D. J. Hahela and J. A. Salehi, "Limits to the encoding and bounds on the performance of coherent ultra short light pulse code-division multiple access sytems", IEEE Trans. Commun., vol. 40, pp. 325-336, 1992.

S. Shen, A. M. Weiner, G. D. Sucha and M. L. Stock, "Bit error rate performance of ultrashort-pulse optical CDMA detection under multi-access interference", Electron. Lett., vol. 36, pp. 1795-1797, Oct. 2000.

Z. Zheng, S. Shen, H. Sardesai, C.-C. Chang, J. H. Marsh, M. M. Karkhanehchi and A. M. Weiner, "Ultrafast two-photon absorption optical thresholding of spectrally coded pulses", Opt. Commun., vol. 167, pp. 225-233, Aug. 1999.

Z. Zheng, A. M. Weiner, K. R. Parameswaran, M. H. Chou and M. M. Fejer, "Low-power spectral phase correlator using periodically poled LiNbO3 waveguides", IEEE Photon. Technol. Lett., vol. 13, pp. 376 -378, Apr. 2001.

H. P. Sardesai and A. M. Weiner, "Nonlinear fiber-optic receiver for ultrashort pulse code division multiple access communications", Electron. Lett., vol. 33, pp. 610-611, Mar. 1997.

S. Shen and A. M. Weiner, "Suppression of WDM interference for error-free detection of ultrashort-pulse CDMA signals in spectrally overlaid hybrid WDM-CDMA operation", IEEE Photon. Technol. Lett., vol. 13, pp. 82 -84, Jan. 2001.

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