Abstract
Feature Issue on
Optical Wireless Communications (OWC)
The ultimate classical
information capacity of multiple-spatial-mode, wideband optical communications in
vacuum between soft-aperture transmit and receive pupils is considered. The ultimate
capacity is shown to be achieved by coherent-state encoding and joint measurements
over entire code words. This capacity is compared with the capacities realized with
the same encoding and homodyne or heterodyne detection, which are single-channel-use
measurements. Realistic background spectral-radiance values are used to obtain tight
bounds on the capacity of single-spatial-mode, narrowband 1.55 μm wavelength
free-space communications in the presence of background light.
© 2005 Optical Society of America
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