Free-space Orbital Angular Momentum Generation, Multiplexing, Demultiplexing and Detection
Open AccessToday’s state-of-an-art technologies cannot satisfy common data traffic demands in industry, military and defense, as well as general consumer-oriented applications. Telecom industry needs new generation data transfer paradigms with increased signal spectral efficiency and new adaptive detection schemes. Orbital angular momentum (OAM) has aroused an extensive interest in the field of optical communication over the past twenty years. More and more researches have been conducted with beams carrying OAM, where its helical wavefront and orthogonal property can be theoretically used for ultra-highly efficient information transmission. Here we discuss the experimentally generation, multiplexing, demultiplexing and detection of OAM beams. We propose a new classical Shannon information defined via Wigner distribution function (WDF) and introduce Groenewold commutative product to get a coherent WDF reconstruction of the detected beams. My contribution to Shannon Groenewold information has been to build the setup and collect the data in lab. At the last, we also discuss the prospects of GHz fast underwater multiplexed OAM generation and detection.
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