Performance analysis of electrical MMSE linear equalizers in optically amplified OOK systems

Jangwoo Park, Wonzoo Chung

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)232-236
Number of pages5
JournalJournal of the Optical Society of Korea
Issue number3
Publication statusPublished - 2011 Sept


  • Electrical equalizers
  • Nonlinear channels
  • Optical communications
  • Square-law detector

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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