Comparison of pulse position modulation and pulse width modulation for application in optical communications

Yangyu Fan; Roger J. Green

doi:10.1117/1.2746010

1 June 2007 Comparison of pulse position modulation and pulse width modulation for application in optical communications

Yangyu Fan, Roger J. Green

Author Affiliations +

Optical Engineering, Vol. 46, Issue 6, 065001 (June 2007). https://doi.org/10.1117/1.2746010

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.

©(2007) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Yangyu Fan and Roger J. Green "Comparison of pulse position modulation and pulse width modulation for application in optical communications," Optical Engineering 46(6), 065001 (1 June 2007). https://doi.org/10.1117/1.2746010

Published: 1 June 2007

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