An efficient stabilization process for analog fractionally spaced equalizers

Hananel Faig, Dan Sadot, Liron Gantz, Shai Cohen

Research output: Contribution to journalArticlepeer-review


An analog fractionally spaced equalizer (FSE) is an efficient solution for high-speed communication system without a clock and data recovery circuit. However, the FSE might become unstable when a sign-sign least mean square tuning algorithm is used, especially when the transmitter pre-distortion is used. Here, an analytical model of the instability is derived, and a low-cost and efficient stabilization process based on dithering is proposed. The analytical instability model is verified in an experimental setup based on a vertical cavity surface emitting laser. Furthermore, it is experimentally demonstrated that in the case of the instability of the FSE, a clear convergence is achieved when applying the proposed stabilization scheme.

Original languageAmerican English
Article number8663418
Pages (from-to)665-668
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number9
StatePublished - 1 May 2019


  • Optical fiber communication
  • analog equalizer
  • dither
  • fractionally-spaced equalizer

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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