High-Capacity Optical Wireless Communication Using Two-Dimensional IR Beam Steering

Abstract

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Fully Passive User Localization for Beam-Steered High-Capacity Optical Wireless Communication System

“…As shown in Fig. 3, the 2D fiber array is preferably positioned closer to the lens than the lens' focal plane, which yields slightly diverging beams [9]. This defocusing yields a more compact PRA module, and a coverage of the user plane which is less dependent on the user's distance to the lens.…”

“…This defocusing yields a more compact PRA module, and a coverage of the user plane which is less dependent on the user's distance to the lens. From the design condition that neighbouring beam spots in the image plane should touch each other for optimum coverage of the user area, and given a desired spot diameter required for adequate received power by the detector's optical aperture, the lens' focal length f and the fiber pitch Δy in the 2D fiber array can be calculated [9].…”

“…We propose a novel device localization concept which only requires a simple fully passive function at the user device, thus not draining the device's battery, while building on our highcapacity IR beam-steered OWC system [9] [10]. We have validated this localization concept in a laboratory system experiment in which multiple high-definition video streams were carried by narrow infrared beams.…”

Ultra-high Capacity Wireless Communication Enabled by Photonic Technologies

“…Due to the absence of waveguide dispersion, such beams basically can even have a higher capacity than an optical fiber. The 2D steering is done by tuning the wavelength of the optical signal, and has been achieved by diffractive techniques applying two crossed gratings, or a high-output-count AWGR where the output fibers are arranged in a 2D matrix positioned in front of a lens [6]. By putting this fiber matrix slightly out of focus of the lens, the divergence of the beams can be adapted for optimum coverage of the user plane, and also a sizable reduction of the size of the beam steering module is achieved.…”

Non-mechanical beam steering: ways and means

“…This would give 1D beam steering. Beam steering in 2 dimensions was accomplished using a high output count array waveguide grating 9 , with the output fibres arranged as a 2D array. A collimating lens was used with the fibres at its focal plane and beam direction is decided by which fibre is emitting -which is in turn determined by the wavelength used.…”