PAM-DMT for intensity-modulated and direct-detection optical communication systems

Sian C.J. Lee, Sebastian Randel, Florian Breyer, A.M.J. Koonen

Research output: Contribution to journalArticleAcademicpeer-review

182 Citations (Scopus)


A novel concept of pulse-amplitude-modulated discrete multitone modulation (PAM-DMT) is presented. It is shown that by pulse amplitude modulation of the subcarriers used, the resulting PAM-DMT time signal can be clipped asymmetrically to achieve a unipolar signal for transmission. The distortion resulting from this asymmetric clipping is orthogonal to the information signal itself, causing no additional penalty. Especially in intensity-modulated direct-detection optical channels, where a unipolar signal is to be transmitted, it is shown that this idea can improve system performance.

Original languageEnglish
Pages (from-to)1749-1751
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number23
Publication statusPublished - 1 Dec 2009


  • Intensity modulation
  • Optical fiber communication
  • Orthogonal frequency-division multiplexing (ofdm)


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