Mode-Division-Multiplexing of Multiple Bessel-Gaussian Beams Carrying Orbital-Angular-Momentum for Obstruction-Tolerant Free-Space Optical and Millimetre-Wave Communication Links

作者：Ahmed Nisar^*; Zhao Zhe; Li Long; Huang Hao; Lavery Martin P J; Liao Peicheng; Yan Yan; Wang Zhe; Xie Guodong; Ren Yongxiong; Almaiman Ahmed; Willner Asher J; Ashrafi Solyman; Molisch Andreas F; Tur Moshe; Willner Alan E

来源：Scientific Reports, 2016, 6(1): 22082.

DOI：10.1038/srep22082

We experimentally investigate the potential of using 'self-healing' Bessel-Gaussian beams carrying orbital-angular-momentum to overcome limitations in obstructed free-space optical and 28-GHz millimetre-wave communication links. We multiplex and transmit two beams (l = +1 and +3) over 1.4 metres in both the optical and millimetre-wave domains. Each optical beam carried 50-Gbaud quadrature-phase-shift-keyed data, and each millimetre-wave beam carried 1-Gbaud 16-quadrature-amplitude-modulated data. In both types of links, opaque disks of different sizes are used to obstruct the beams at different transverse positions. We observe self-healing after the obstructions, and assess crosstalk and power penalty when data is transmitted. Moreover, we show that Bessel-Gaussian orbital-angular-momentum beams are more tolerant to obstructions than non-Bessel orbital-angularmomentum beams. For example, when obstructions that are 1 and 0.44 the size of the l = +1 beam, are placed at beam centre, optical and millimetre-wave Bessel-Gaussian beams show similar to 6 dB and similar to 8 dB reduction in crosstalk, respectively.

• 出版日期2016-3-1