Use the properties of birefringement to create a free standard stereoscope viewer. Calcite Crystal split incoming circular polarised beam or a beam that consists of vertical and horizontal polarisation states.
Notice the delayed quantum eraser experiment uses this property of birefringement to create overlapping alternating out of phase interference patterns at the signal detector as described at the following link@:
http://physicsexplained.blogspot.com/2015/11/the-main-illustrationbelow-is-schematic.html
Encode two data streams into the circular polarised beam so that one data stream is preserved in the horizontal part of the cycle and a seperate channel encoded in the vertical part of the cycle. Then this data could be extracted into two seperate beams again by simply putting the encoded circular polarised beam through a calcite crystal.
In particular if two stereoscopic images were encoded into a circular polarised beam. The right hand image on the horizontal part of the cycle, the left hand image on the vertical part of the cycle. Then this could be sent through a fibre optical network and at the other end the beam would be sent through a calcite crystal, the two stereoscopic images extracted and seperated by the crystal into two images, right and left. At which point the viewer could look at the crystal, change their eye focus so stereo images merge...and a true freestanding stereoscopic image could produced. Without need for special eyeglasses. Possibly the viewer side of the crystal surface could be made slightly convex to separate the two images so that one image at a time only would be seen by each eye.
