OSA's Digital Library

Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 25, Iss. 8 — Aug. 1, 2007
  • pp: 2033–2043

Digital Equalization of Chromatic Dispersion and Polarization Mode Dispersion

Ezra Ip and Joseph M. Kahn

Journal of Lightwave Technology, Vol. 25, Issue 8, pp. 2033-2043 (2007)

View Full Text Article

Acrobat PDF (345 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

  • Export Citation/Save Click for help


In this paper, we consider a fractionally spaced equalizer (FSE) for electronic compensation of chromatic dispersion (CD) and polarization-mode dispersion (PMD) in a dually polarized (polarization-multiplexed) coherent optical communications system. Our results show that the FSE can compensate any arbitrary amount of CD and first-order PMD distortion, provided that the oversampling rate is at least 3/2 and that a sufficient number of equalizer taps are used. In contrast, the amount of CD and PMD that can be corrected by a symbol-rate equalizer only approaches an asymptotic limit, and increasing the number of taps has no effect on performance due to aliasing that causes signal cancellation and noise enhancement.

© 2007 IEEE

Ezra Ip and Joseph M. Kahn, "Digital Equalization of Chromatic Dispersion and Polarization Mode Dispersion," J. Lightwave Technol. 25, 2033-2043 (2007)

Sort:  Year  |  Journal  |  Reset


  1. J. Wang, J. M. Kahn, "Performance of electrical equalizers in optically amplified OOK and DPSK systems," IEEE Photon. Technol. Lett. 16, 1397-1399 (2004).
  2. D. Schlump, B. Wedding, H. Bülow, "Electronic equalisation of PMD and chromatic dispersion induced distortion after 100 km standard fibre at 10 Gb/s," Proc. ECOC (1998) pp. 535-536.
  3. F. Buchali, H. Bülow, "Adaptive PMD compensation by electrical and optical techniques," J. Lightw. Technol. 22, 1116-1126 (2004).
  4. R. Noé, D. Sandel, M. Yoshida-Dierolf, S. Hinz, V. Mirvoda, A. Schopflin, C. Glingener, E. Gottwald, C. Scheerer, G. Fischer, T. Weyrauch, W. Haase, "Polarization mode dispersion compensation at 10, 20, and 40 Gb/s with various optical equalizers ," J. Lightw. Technol. 17, 1602-1616 (1999).
  5. H. Rosenfeldt, R. Ulrich, U. Feiste, R. Ludwig, H. G. Weber, A. Ehrhardt, "PMD compensation in 10 Gb/s NRZ field experiment using polarimetric error signal," Electron. Lett. 36, 448-450 (2000).
  6. J. G. Proakis, Digital Communications (McGraw-Hill, 1995).
  7. R. D. Gitlin, S. B. Weinstein, "Fractionally spaced equalization: An improved digital transversal equalizer," Bell Syst. Tech. J. 60, 275-296 (1981).
  8. G. Ungerboeck, "Fractional tap-spacing equalizer and consequences for clock recovery in data modems ," IEEE Trans. Commun. COM-24, 856-864 (1976).
  9. S. Qureshi, "Adaptive equalization," Proc. IEEE 73, 1349-1387 (1985).
  10. J. G. Proakis, "Adaptive equalization for TDMA digital mobile radio," IEEE Trans. Veh. Technol. 40, 333-341 (1991).
  11. C. J. Nicol, P. Larsson, K. Azadet, J. H. O'Neill, "A low-power 128-tap digital adaptive equalizer for broadband modems," IEEE J. Solid-State Circuits 32, 1777-1789 (1997).
  12. S. Tsukamoto, K. Katoh, K. Kikuchi, "Unrepeated transmission of 20-Gb/s optical quadrature phase-shift-keying signal over 200-km standard single-mode fiber based on digital processing of homodyne-detected signal for group-velocity dispersion compensation," IEEE Photon. Technol. Lett. 18, 1016-1018 (2006).
  13. S. Tsukamoto, K. Katoh, K. Kikuchi, "Coherent demodulation of optical multilevel phase-shift-keying signals using homodyne detection and digital signal processing," IEEE Photon. Technol. Lett. 18, 1131-1133 (2006).
  14. M. G. Taylor, "Coherent detection method using DSP for demodulation of signal and subsequent equalization of propagation impairments," IEEE Photon. Technol. Lett. 16, 674-676 (2004).
  15. K. P. Ho, "Generation of arbitrary quadrature-amplitude modulation signals using a single dual-drive modulator," Proc. IEEE/LEOS Workshop Adv. Modulation Formats (2004) pp. 11-12.
  16. G. P. Agrawal, Fiber-Optic Communication Systems (Wiley, 1997).
  17. J. M. Cioffi, G. P. Dudevoir, M. V. Eyuboglu, G. D. Forney, "MMSE decision-feedback equalizers and coding—Part I: Equalization results," IEEE Trans. Commun. 43, 2582-2594 (1995).
  18. E. Ip, J. M. Kahn, "Power spectra of return-to-zero optical signals," J. Lightw. Technol. 24, 1610-1618 (2006).
  19. K.-P. Ho, J. M. Kahn, "Spectrum of externally modulated optical signals," J. Lightw. Technol. 2, 658-663 (2004).
  20. J. Winters, "Equalization in coherent lightwave systems using a fractionally spaced equalizer," J. Lightw. Technol. 8, 1487-1491 (1990).
  21. S. Fan, J. M. Kahn, "Principal modes in multimode waveguides," Opt. Lett. 30, 135-137 (2005).
  22. N. Amitay, J. Salz, "Linear equalization theory in digital data transmission over dually polarized fading radio channels," Bell Labs Tech. J. 63, 2215-2259 (1984).

Cited By

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited