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Free-space optical propagation of pulse coded data stream

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Abstract

Free-space optical communication provides much larger information bandwidth to transmit information over radio frequency and microwave[1][2]. Most wireless optical systems are essentially used in clear sky conditions and based on the direct detection of attenuated ballistic signal. Unfortunately, multiple scattering from cloud or fog impairs the wireless connection. In this experiment, space and polarization gating techniques are used to reduce diffusive background[3] and improve the extraction of coded signals using ultrafast laser source. Fig.1 shows the experimental setup. 10 GHz signal train carried by 100fs laser pulse goes through the cloud chamber. We detected the transmitted signal using a streak camera in combination with a spatial and polarization gate. The significant improvement is shown in Fig.2 where signal-to-noise ratio has been increased. The potential application of these techniques will benefit the wireless optical communication under different weather conditions. The prospect for their application in wireless optical local network system is encouraging.

© 2003 Optical Society of America

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