-3 even under the influence of strong atmospheric turbulence with Cn2 = 3 ×10-12 and misalignment of 1.8 mm. Encoding digital signals to OAM modes and amplitude of optical vortex beams simultaneously, we construct a novel multi-modulation format composed of 16 QAM-OFDM and OAM-SK signals, which is also demodulated with the BER of 10-5 at the optical signal-to-noise ratio (OSNR) of 18 dB. These demonstrate that the direct-demodulation method provides a feasible way to demodulate OAM-SK signals and may show potential in complex OAM modulation communications.">

Optical Orbital Angular Momentum Shift-Keying Communication Using Direct Demodulation (original) (raw)

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