Patent ID: 9564968
Date: 2017-02-07
CPC Classifications: H04B

Claim:
1. A method comprising: collecting two or more free space optical beams including data encoded with space-time block codes onto a multimode fiber bundle having two or more spatially separated subapertures; outputting a sub-beam carrying information thereon from each subaperature; detecting each of the sub-beams to produce outputs; controlling amplitude and phase independently for each of the sub-beams according to multiple-input multiple-output processing; and recovering, based upon the data encoded with space-time block codes, multiple, undistorted signals including spatially multiplexed, independent information streams from the outputs, wherein the subaperatures of the multimode fiber bundle are each coupled to a transmit aperture forming a matrix, the matrix having plural propagation coefficients, each propagation coefficient representing an attenuation value and phase delay of the coupled subaperature and transmit aperature, and the matrix is inverted to separate the multiple, undistorted signals including spatially multiplexed, independent information streams and correct for atmospheric turbulence causing distortions.