Terabit free-space data transmission employing orbital angular momentum multiplexing
Terabit free-space data transmission employing orbital angular momentum multiplexing
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DOI：
10.1038/nphoton.2012.138
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发表时间：
2012-07-01
期刊：
影响因子：
35
通讯作者：
Willner, Alan E.
中科院分区：
文献类型：
--
作者：
Wang, Jian;Yang, Jeng-Yuan;Willner, Alan E.
20世纪90年代，人们认识到具有螺旋相位前锋的光束具有轨道角动量，这一认识使从光学操纵到量子信息处理的各种应用都受益。最近，人们的注意力转向了在通信中利用这种光束的机会。在这里，我们证明了用42.8x4Gbit S(-1)正交幅度调制(16-QAM)信号编码的四束不同轨道角动量的光束可以被复用和解复用，当与偏振复用相结合时，允许1.37Tbit的S(-1)聚合率和25.6bit的S(-1)赫兹(-1)的频谱效率。此外，在空间域上，我们展示了两组同心环的可扩展性，这些同心环由8个极化复用的20x4Gbit S(-1)16QAM承载的轨道角动量光束组成，获得了2.56Tbit S(-1)的容量和95.7bit S(-1)Hz(-1)的频谱效率。我们还报道了用100Gbit S(-1)差分正交相移键控信号编码的轨道角动量光束之间的数据交换。这些演示表明，轨道角动量可能是增加自由空间通信能力的有用自由度。
The recognition in the 1990s that light beams with a helical phase front have orbital angular momentum has benefited applications ranging from optical manipulation to quantum information processing. Recently, attention has been directed towards the opportunities for harnessing such beams in communications. Here, we demonstrate that four light beams with different values of orbital angular momentum and encoded with 42.8 x 4 Gbit s(-1) quadrature amplitude modulation (16-QAM) signals can be multiplexed and demultiplexed, allowing a 1.37 Tbit s(-1) aggregated rate and 25.6 bit s(-1) Hz(-1) spectral efficiency when combined with polarization multiplexing. Moreover, we show scalability in the spatial domain using two groups of concentric rings of eight polarization-multiplexed 20 x 4 Gbit s(-1) 16-QAM-carrying orbital angular momentum beams, achieving a capacity of 2.56 Tbit s(-1) and spectral efficiency of 95.7 bit s(-1) Hz(-1). We also report data exchange between orbital angular momentum beams encoded with 100 Gbit s(-1) differential quadrature phase-shift keying signals. These demonstrations suggest that orbital angular momentum could be a useful degree of freedom for increasing the capacity of free-space communications.