Offset tolerance of an orbital angular momentum optical communication system with angular deflection

Offset tolerance of an orbital angular momentum optical communication system with angular deflection
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具有角偏转的轨道角动量光通信系统的偏移容差

DOI:
10.1016/j.optcom.2017.02.014
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发表时间:
2017-06
影响因子:
2.4
通讯作者:
Guo-hua Wu
Guo-hua Wu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Xiao-li Yin;Hong-qing Sang;Xiao-Zhou Cui;Huan Chang;Li Li;Guo-hua Wu

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这项工作研究了偏移容差 (OT),特别关注自由空间中轨道角动量 (OAM) 系统的角偏转。我们通过傅立叶级数 (FS) 展开导出了角度偏转拉盖尔高斯 (LG) 光束的 OT 解析表达式,并确定了 OAM 复用系统的 OT 上限。接下来,我们数值分析了束腰、传输距离和OAM状态数对OT的影响。计算结果表明,偏转光束的OT与OAM数的平方根成反比,与传播距离近似成倒数。最后,我们计算了具有不同通道组的复用系统的误码率(BER)和聚合容量。结果证实估计的上限是合理的,特别是对于较大的模式间距。这项工作可以为角度偏转OAM复用通信系统的设计和优化提供指导。
This work studied the offset tolerance (OT) with a particular focus on the angular deflection of an orbital angular momentum (OAM) system in free space. We derived an analytical expression of the OT for an angular-deflected Laguerre-Gaussian (LG) beam via Fourier series (FS) expansion and determined the upper bound of the OT for OAM-multiplexed systems. Next, we analyzed the effects of the beam waist, transmitted distance and OAM state number on the OT numerically. The calculation results indicate that the OT of the deflected beam is inversely proportional to the square root of the OAM number and approximately reciprocal to the propagation distance. Finally, we calculated the bit-error rate (BER) and aggregated capacity of multiplexed systems with different sets of channels. The results confirmed that the estimated upper bound is reasonable, especially for larger mode spacings. This work can provide guidance for the design and optimization of angular-deflected OAM-multiplexed communication systems.
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