Abstract
We show how multiple optimal orthogonal channels for communicating or interconnecting with waves
between two objects can be aligned and optimized automatically using controllable beamsplitters, detectors and simple
local feedback loops, without moving parts, without device calibration, without fundamental beam splitting loss, and
without calculations. Optical applications include multiple simultaneous orthogonal spatial communication channels in
free space or multimode optical fibers, automatically focused power delivery with waves, multiple channel
communication through scattering or lossy media, and real-time-optimized focused channels to and from multiple moving
objects. The approach physically implements automatic singular value decomposition of the wave coupling between the
objects, and is equivalent in its effect to the beam forming in a laser resonator with phase-conjugate mirrors with
the additional benefits of allowing multiple orthogonal channels to be formed simultaneously and avoiding the need for
any nonlinear optical materials.
© 2013 IEEE
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