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Terabit wireless potential of Wavelength Division Multiplexing (WDM) is explored in this paper, through a novel detection algorithm over single-slit receiver. Different from current solutions that separates signals on different wavelengths by optical components (e.g. lens), the authors' solution is based on simpler architecture and signal processing. The receiving signal is first passed through single-slit to be summation of a set of square-sinc functions, where each square-sinc corresponds to signal on one wavelength. Then, they apply a nonlinear differential operator on the received signal to convert it to a fractional function, where each square-sinc becomes a pole. By identifying the existence of each pole in parallel, they can detect signal on each wavelengths efficiently.
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