Optical propagation simulations for the case of a laser optical link between two stratospheric High Altitude Platforms have been performed. The simulations, together with communications link budget calculations, show that high data rate communications between such platforms is feasible, at data rates up to several hundred Mbps, and optical transmit-power levels of less than 1W for a 500 km long inter platform path. Such data rates and power levels are close to the capabilities of current

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... ogy. The simulations have included use of known parameters of the optical properties of the upper atmosphere, in particular absorption by atmospheric aerosols, and atmospheric turbulence.