Journal of the Optical Society of Korea

Optical Society of Korea (한국광학회)
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Performance Analysis of Electrical MMSE Linear Equalizers in Optically Amplified OOK Systems

  • Park, Jang-Woo (Division of Computer and Communication Engineering, Korea University) ;
  • Chung, Won-Zoo (Division of Computer and Communication Engineering, Korea University)
  • Received : 2011.07.21
  • Accepted : 2011.08.02
  • Published : 2011.09.25
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Abstract

We analyze the linear equalizers used in optically amplified on-off-keyed (OOK) systems to combat chromatic dispersion (CD) and polarization mode dispersion (PMD), and we derive the mathematical minimum mean squared error (MMSE) performance of these equalizers. Currently, the MMSE linear equalizer for optical OOK systems is obtained by simulations using adaptive approaches such as least mean squared (LMS) or constant modulus algorithm (CMA), but no theoretical studies on the optimal solutions for these equalizers have been performed. We model the optical OOK systems as square-law nonlinear channels and compute the MMSE equalizer coefficients directly from the estimated optical channel, signal power, and optical noise variance. The accuracy of the calculated MMSE equalizer coefficients and MMSE performance has been verified by simulations using adaptive algorithms.

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References

  1. G. P. Agrawal, Nonlinear Fiber Optics (Academic Press, San Diego, USA, 2001).
  2. J. Wang and J. M. Kahn, "Performance of electrical equalizers in optically amplified OOK and DPSK systems," IEEE Photon. Technol. Lett. 16, 1397-1399 (2004). https://doi.org/10.1109/LPT.2004.826222
  3. A. H. Gnauck, L. J. Cimini, J. Stone, and L. W. Stulz, "Optical equalization of fiber chromatic dispersion in a 5-Gb/s transmission system," IEEE Photon. Technol. Lett. 8, 585-587 (1990).
  4. P. M. Watts, V. Michailov, S. Savory, P. Bayvel, M. Glick, M. Lobel, B. Christensen, P. Kirkpatrick, S. Shang, and R. I. Killey, "Performance of single-mode fiber links using electronic feed-forward and decision feedback equalizers," IEEE Photon. Technol. Lett. 17, 2206-2208 (2005). https://doi.org/10.1109/LPT.2005.856326
  5. A. J. Weiss, "On the performance of electrical equalization in optical fiber transmission systems," IEEE Photon. Technol. Lett. 15, 1225-1227 (2003). https://doi.org/10.1109/LPT.2003.816120
  6. E. Ibragimov, "Limits of optical dispersion compensation using linear electrical equalizers," IEEE Photon. Technol. Lett. 18, 1427-1429 (2006). https://doi.org/10.1109/LPT.2006.877225
  7. J. G. Proakis, Digital Communication (McGraw-Hill, New York, USA, 2001).
  8. K. S. Kim, J. Lee, W. Chung, and S. C. Kim, "An electronic domain chromatic dispersion monitoring scheme insensitive to OSNR using kurtosis," J. Opt. Soc. Korea 12, 249-254 (2008). https://doi.org/10.3807/JOSK.2008.12.4.249
  9. M. Khafaji, H. Gustat, F. Ellinger, and C. Scheytt, "General time domain representation of chromatic dispersion in singlemode fibers," IEEE Photon. Technol. Lett. 22, 314-316 (2010). https://doi.org/10.1109/LPT.2009.2038355

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