Abstract
Communication by spectral modulation of white light was proposed a few years ago and has been demonstrated via electro-optic techniques. Compared with conventional modulation intensity systems, the present method takes advantage of simultaneous transmission and reception of analogue signals without any electronic coding of the information. The information is carried along the chosen channel in the form of time-varying path differences between wave-groups of white light. In the device proposed here, these path-differences are introduced at the emission stage by using a set of birefringent quartz plates and transverse electro-optic modulators acting as delay lines. The propagation medium is the atmosphere (steady or turbulent) or any type of light pipe (e.g. a fibre bundle). At the reception stage, the signals are led to a detector PIN array after decoding via Fourier transform spectroscopy; another set of birefringent quartz plates introduces path-differences tuned on and matched with the various carriers....
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