The influence of timing error on performance of optical pulse PPM system in atmospheric turbulence

Abstract

Abstract With the avalanche photodiode (APD) as th e receiver, we have studied the timing error influence on performance of the optical pulse PPM system after analyzing the channel model of the atmospheric laser communication, and respectively obtained the relationship between the normalized timing error and PWE in the strong and weak turbulent environment. In addition, we obtained the influences of parameters such as the scintillation index, APD average gain and the levels of PPM modulation on performance of the optical pulse PPM system by simulation when there are timing errors in the system. Key words: Atmospheric laser communication, Pulse position modulated, Atmospheric tu rbulence, Timing error 1. Introduction The atmospheric laser communication is a ki nd of technique that makes use of a la ser beam as an information carrier to achieve the two-way transmission of voice, data, and image information in the atmosphere. It combines the respective advantages of optical communication and wireless communication. It has large information capacity and narrow emission beams. Besides, its anti-electro magnetic interference capability is great, and it is off-frequency resources with good prospects for development. The atmospheric laser communication systems typically use the demodulation of pulse position modulation (PPM)