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Multipath Time Spreading of Optical Pulses Propagating through a Scattering Medium
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
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Multipath time spreading of the optical pulse is a consequence which must be accepted when receiver Field of View accomodation is used in optical communications. Given the high data rates expected of a viable optical communication system multipath time spreading of the received pulses can produce intersymbol interference increasing the error rate. The full scale experiments which have been reported do not specify the scatterers parameters such as particle size distribution, concentration, size and shape precisely. One objective of this investigation was to conduct a controlled scattering experiment wherein these parameters were known precisely. The uniform latex particles in aqueous suspension which were used to simulate water droplets in the atmosphere satisfied this requirement. A mode locked HeNe laser provided optical pulses typical of those encountered in optical communications systems.
APPROVED FOR PUBLIC RELEASE