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

Author

Lee, Sian C Jeffrey ; Randel, Sebastian ; Breyer, Florian ; Koonen, Antonius M J

Author_Institution

COBRA Res. Inst., Tech. Univ. of Eindhoven, Eindhoven, Netherlands

Volume

21

Issue

23

fYear

2009

Firstpage

1749

Lastpage

1751

Abstract

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.

Keywords

OFDM modulation; distortion; optical fibre communication; pulse amplitude modulation; asymmetric clipping; direct-detection optical communication system; discrete multitone modulation; distortion; intensity-modulation; orthogonal frequency-division multiplexing; pulse-amplitude-modulation; time signal; Intensity modulation; optical fiber communication; orthogonal frequency-division multiplexing (OFDM);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2009.2032663

Filename

5272448