Demonstration of data-carrying orbital angular momentum-based underwater wireless optical multicasting link
Demonstration of data-carrying orbital angular momentum-based underwater wireless optical multicasting link
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DOI：
10.1364/oe.25.028743
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发表时间：
2017-11
期刊：
影响因子：
3.8
通讯作者：
Yifan Zhao;Jing Xu;Andong Wang;Weichao Lv;Long Zhu;Shuhui Li;Jian Wang
中科院分区：
文献类型：
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作者：
Yifan Zhao;Jing Xu;Andong Wang;Weichao Lv;Long Zhu;Shuhui Li;Jian Wang
水下无线通信在多个用户之间分配信号时，需要一对多的数据信息传输，也称为组播。本文利用光波的空间域（空间相位结构），提出并演示了一种基于轨道角动量（OAM）的水下无线光多播链路。实验演示了4倍绿光（520 nm） OAM模式（OAM-6、OAM-3、OAM+3、OAM+6）在水下2米传输，每个通道携带1.5 gbaud 8-ary正交调幅（8-QAM）正交频分复用（OFDM）信号。水下传播后的OAM频谱由于组播OAM信道和其他不需要的信道之间的串扰小于- 6 dB而受到一定的衰减。误码率（BER）性能的特点是有~ 2db的损失。在自由空间OAM多播链路中还考虑了高阶调制信号（16-QAM-OFDM、32-QAM-OFDM）进行比较。
One-to-many data information transfer, also known as multicasting, is desired in underwater wireless communications when distributing signal between multiple users. In this paper, by exploiting the space domain (spatial phase structure) of lightwaves, we propose and demonstrate an orbital angular momentum (OAM)-based underwater wireless optical multicasting link. 2-meter underwater transmission of 4-fold green light (520 nm) OAM modes multicasting (OAM-6, OAM-3, OAM+3, OAM+6), each channel carrying 1.5-Gbaud 8-ary quadrature amplitude modulation (8-QAM) with orthogonal frequency-division multiplexing (OFDM) signal, is demonstrated in the experiment. The OAM spectrum after underwater propagation suffers some degradation with the crosstalk between multicasting OAM channels and other unwanted channels measured to be less than −6 dB. Bit-error rate (BER) performance is characterized with ~2 dB penalty. Higher-order modulation signals (16-QAM-OFDM, 32-QAM-OFDM) are also considered in free-space OAM multicasting link for comparison.