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PAM-DMT for Intensity-Modulated and Direct-Detection Optical Communication Systems

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4 Author(s)
Lee, S.C.J. ; COBRA Res. Inst., Tech. Univ. of Eindhoven, Eindhoven, Netherlands ; Randel, S. ; Breyer, F. ; Koonen, A.M.J.

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 23 )