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Optical Engineering

Comparison of pulse position modulation and pulse width modulation for application in optical communications
Author(s): Yangyu Fan; Roger J. Green
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Paper Abstract

Different modulation methods for optical wireless have different power and bandwidth efficiencies. Each approach has a direct bearing on the quality and effectiveness of wireless optical communications. As two prime examples, pulse position modulation (PPM) and pulse width modulation (PWM) are compared. The comparison includes the power and bandwidth efficiencies, the power spectrum distribution, and the ability to resist intersymbol interference. Compact system models of multilevel digital PPM (L-PPM), and multilevel digital PWM (L-PWM) are also introduced. The results show that L-PPM has advantages in power efficiency and an approximately uniform spectral distribution, whereas L-PWM has a greater ability to resist intersymbol interference.

Paper Details

Date Published: 1 June 2007
PDF: 7 pages
Opt. Eng. 46(6) 065001 doi: 10.1117/1.2746010
Published in: Optical Engineering Volume 46, Issue 6
Show Author Affiliations
Yangyu Fan, Northwestern Polytechnical Univ. (China)
Roger J. Green, Univ. of Warwick (United Kingdom)


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