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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 2 — Jan. 21, 2008
  • pp: 804–817

Digital filters for coherent optical receivers

Seb J. Savory  »View Author Affiliations

Optics Express, Vol. 16, Issue 2, pp. 804-817 (2008)

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Digital filters underpin the performance of coherent optical receivers which exploit digital signal processing (DSP) to mitigate transmission impairments. We outline the principles of such receivers and review our experimental investigations into compensation of polarization mode dispersion. We then consider the details of the digital filtering employed and present an analytical solution to the design of a chromatic dispersion compensating filter. Using the analytical solution an upper bound on the number of taps required to compensate chromatic dispersion is obtained, with simulation revealing an improved bound of 2.2 taps per 1000ps/nm for 10.7GBaud data. Finally the principles of digital polarization tracking are outlined and through simulation, it is demonstrated that 100krad/s polarization rotations could be tracked using DSP with a clock frequency of less than 500MHz.

© 2008 Optical Society of America

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.4510) Fiber optics and optical communications : Optical communications

ToC Category:
Coherent Receivers

Original Manuscript: September 4, 2007
Revised Manuscript: November 14, 2007
Manuscript Accepted: November 14, 2007
Published: January 9, 2008

Virtual Issues
Coherent Optical Communication (2008) Optics Express

Seb J. Savory, "Digital filters for coherent optical receivers," Opt. Express 16, 804-817 (2008)

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