Abstract

We experimentally demonstrate the existence of an optimal decision threshold in an optical code-division-multiple-access (O-CDMA) system and show its relation to the number of active users. Our results show that tuning the decision threshold in an O-CDMA receiver to an optimal point based on the number of active users improves receiver sensitivity by > 3 dB. We also demonstrate a monitoring scheme to estimate the number of active users in an O-CDMA system using harmonics of RF clock tones.

© 2005 IEEE

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  1. J. A. Salehi, "Code division multiple-access techniques in optical fiber networks-Part I: Fundamental principles", IEEE Trans. Commun., vol. 37, no. 8, pp. 824-833, Aug. 1989.
  2. J. A. Salehi and C. A. Brackett, "Code division multiple-access techniques in optical fiber networks-Part II: Systems performance analysis", IEEE Trans. Commun., vol. 37, no. 8, pp. 834-842, Aug. 1989.
  3. P. Kamath, J. D. Touch and J. A. Bannister, "The need for media access control in optical CDMA networks", in Information Communications (INFOCOM), vol. 4, Hong Kong, Mar. 2004, pp. 2208-2219.
  4. P. Kamath, J. D. Touch and J. A. Bannister, "Algorithms for interference sensing in optical CDMA networks", in Proc. IEEE Int. Conf. Communications, vol. 3, Paris, France,Jun. 2004, pp. 1720-1724.
  5. P. R. Prucnal, M. A. Santoro and T. R. Fan, "Spread spectrum fiber-optic local area network using optical processing", J. Lightw. Technol., vol. LT-4, no. 5, pp. 547-554, May 1986.
  6. L. Tancevski and I. Andonovic, "Hybrid wavelength hopping/time spreading schemes for use in massive optical LANs with increased security", J. Lightw. Technol., vol. 14, no. 12, pp. 2636-2647, Dec. 1996.
  7. H. Fathallah, L. A. Rusch and S. LaRochelle, "Passive optical fast frequency-hop CDMA communications system", J. Lightw. Technol., vol. 17, no. 3, pp. 397-405, Mar. 1999.
  8. G.-C. Yang and W. C. Kwong, Prime Codes With Applications to CDMA Optical and Wireless Networks, Boston, MA: Artech House, 2002.
  9. 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. Lightw. Technol., vol. 19, no. 9, pp. 1274-1281, Sep. 2001.
  10. S. P. Wan and Y. Hu, "Two-dimensional optical CDMA differential system with prime/OOC codes", IEEE Photon. Technol. Lett., vol. 13, no. 12, pp. 1373-1375, Dec. 2001.
  11. W. C. Kwong and G.-C. Yang, "Extended carrier-hopping prime codes for wavelength-time optical code-division multiple access", IEEE Trans. Commun., vol. 52, no. 7, pp. 1084-1091, Jul. 2004.
  12. M. Azizoglu, J. A. Salehi and Y. Li, "Optical CDMA via temporal codes", IEEE Trans. Commun., vol. 40, no. 7, pp. 1162-1170, Jul. 1992.
  13. P. Saghari, R. Omrani, A. E. Willner and P. V. Kumar, "Analytical interference model for 2-dimensional (time-wavelength) asynchronous OCDMA systems", in Proc. Optical Fiber Communication Conf. (OFC), vol. 2, Los Angeles, CA, Feb. <day>26-27</day> 2004, pp. 493-495.
  14. W. C. Kwong, P. A. Perrier and P. R. Prucnal, "Performance comparison of asynchronous and synchronous code-division multiple-access techniques for fiber-optic local area networks", IEEE Trans. Commun., vol. 39, no. 11, pp. 1625-1634, Nov. 1991.
  15. E. K. H. Ng and E. H. Sargent, "Optimum threshold detection in real-time scalable high-speed multi-wavelength optical code-division multiple-access LANs", IEEE Trans. Commun., vol. 50, no. 5, pp. 778-784, May 2002.
  16. R. Omrani, E. Elia and P. V. Kumar, "New constructions and bounds for 2-D optical orthogonal codes", in Sequences and Their Applications (SETA), Seoul, Korea,Oct. <day>24-28</day> 2004, pp. 389-395.
  17. D. C. Kilper, R. Bach, D. J. Blumenthal, D. Einstein, T. Landolsi, L. Ostar, M. Preiss and A. E. Willner, "Optical performance monitoring", J. Lightw. Technol., vol. 22, no. 1, pp. 294-304, Jan. 2004.

Other (17)

J. A. Salehi, "Code division multiple-access techniques in optical fiber networks-Part I: Fundamental principles", IEEE Trans. Commun., vol. 37, no. 8, pp. 824-833, Aug. 1989.

J. A. Salehi and C. A. Brackett, "Code division multiple-access techniques in optical fiber networks-Part II: Systems performance analysis", IEEE Trans. Commun., vol. 37, no. 8, pp. 834-842, Aug. 1989.

P. Kamath, J. D. Touch and J. A. Bannister, "The need for media access control in optical CDMA networks", in Information Communications (INFOCOM), vol. 4, Hong Kong, Mar. 2004, pp. 2208-2219.

P. Kamath, J. D. Touch and J. A. Bannister, "Algorithms for interference sensing in optical CDMA networks", in Proc. IEEE Int. Conf. Communications, vol. 3, Paris, France,Jun. 2004, pp. 1720-1724.

P. R. Prucnal, M. A. Santoro and T. R. Fan, "Spread spectrum fiber-optic local area network using optical processing", J. Lightw. Technol., vol. LT-4, no. 5, pp. 547-554, May 1986.

L. Tancevski and I. Andonovic, "Hybrid wavelength hopping/time spreading schemes for use in massive optical LANs with increased security", J. Lightw. Technol., vol. 14, no. 12, pp. 2636-2647, Dec. 1996.

H. Fathallah, L. A. Rusch and S. LaRochelle, "Passive optical fast frequency-hop CDMA communications system", J. Lightw. Technol., vol. 17, no. 3, pp. 397-405, Mar. 1999.

G.-C. Yang and W. C. Kwong, Prime Codes With Applications to CDMA Optical and Wireless Networks, Boston, MA: Artech House, 2002.

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. Lightw. Technol., vol. 19, no. 9, pp. 1274-1281, Sep. 2001.

S. P. Wan and Y. Hu, "Two-dimensional optical CDMA differential system with prime/OOC codes", IEEE Photon. Technol. Lett., vol. 13, no. 12, pp. 1373-1375, Dec. 2001.

W. C. Kwong and G.-C. Yang, "Extended carrier-hopping prime codes for wavelength-time optical code-division multiple access", IEEE Trans. Commun., vol. 52, no. 7, pp. 1084-1091, Jul. 2004.

M. Azizoglu, J. A. Salehi and Y. Li, "Optical CDMA via temporal codes", IEEE Trans. Commun., vol. 40, no. 7, pp. 1162-1170, Jul. 1992.

P. Saghari, R. Omrani, A. E. Willner and P. V. Kumar, "Analytical interference model for 2-dimensional (time-wavelength) asynchronous OCDMA systems", in Proc. Optical Fiber Communication Conf. (OFC), vol. 2, Los Angeles, CA, Feb. <day>26-27</day> 2004, pp. 493-495.

W. C. Kwong, P. A. Perrier and P. R. Prucnal, "Performance comparison of asynchronous and synchronous code-division multiple-access techniques for fiber-optic local area networks", IEEE Trans. Commun., vol. 39, no. 11, pp. 1625-1634, Nov. 1991.

E. K. H. Ng and E. H. Sargent, "Optimum threshold detection in real-time scalable high-speed multi-wavelength optical code-division multiple-access LANs", IEEE Trans. Commun., vol. 50, no. 5, pp. 778-784, May 2002.

R. Omrani, E. Elia and P. V. Kumar, "New constructions and bounds for 2-D optical orthogonal codes", in Sequences and Their Applications (SETA), Seoul, Korea,Oct. <day>24-28</day> 2004, pp. 389-395.

D. C. Kilper, R. Bach, D. J. Blumenthal, D. Einstein, T. Landolsi, L. Ostar, M. Preiss and A. E. Willner, "Optical performance monitoring", J. Lightw. Technol., vol. 22, no. 1, pp. 294-304, Jan. 2004.

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