Addendum to Wide-coverage beam-steered 40-Gbit/s non-line-of-sight optical wireless connectivity for Industry 4.0

We were recently made aware of the fact that Professor Nabeel A. Rizas laboratory theoretically proposed earlier a Non-Line of Sight (NLOS) indoor optical wireless communications arrangement with three-dimensional optical beamforming via a spatial light modulator using diffuse reflections from diffuse optical elements [1]. This is exactly the type of arrangement that would benefit greatly from our technique, since the coherent arrayed optical transmitter (CAO-Tx) we proposed makes the reflection focus onto the receiver, rather than diffusely scatter it in all directions. We apologize for the omission of this prior-art. [1] P.J. Marraccini and N.A. Riza, Smart multiple-mode indoor optical wireless design and multimode light source smart energy-efficient links, Optical Engineering, SPIE. Digital Library, vol. 52, no. 5, May 2013.