摘要
提出一种海洋湍流随机相位屏模型。以海水折射率波动谱为基础,通过功率谱反演法将海洋湍流引起海水介质的折射率变化对传输光束产生的影响等效为随机相位屏对光束的影响,并利用相位结构函数和轨道角动量光束在海洋湍流中的传输特性验证该模型的有效性。研究结果表明:在光束折射率偏移量较小时,由随机相位屏模型获得的相位结构函数仿真值与理论值可较好地吻合;由随机相位屏模型获得的轨道角动量光束传输特性也与理论分析结果相一致。
A random phase screen model of ocean turbulence is proposed. Based on the fluctuating spectrum of ocean refractive index, the influence of the refractive index fluctuation of ocean medium on the transmitted beam caused by oceanic turbulence is equivalent to the influence of random phase screens on the beam with the power spectrum inversion method. The validity of the proposed model is testified by the phase structure function and the transmission characteristic of orbital angular momentum beam in ocean turbulence. Results show that the phase structure function values calculated by the random phase screen model are coincident with the theoretical results when the offset of beam refractive index is small. At the same time, the transmission characteristics of the orbital angular momentum beam obtained by the random phase screen model are also consistent with the theoretical analysis results.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2017年第12期1-6,共6页
Acta Optica Sinica
基金
国家自然科学基金(64075075
61271238)
教育部"宽带无线通信与传感网技术"重点实验室开放课题(NYKL2015011)
关键词
海洋光学
海洋湍流相位屏
功率谱反演
水下光通信
轨道角动量
oceanic optics
ocean turbulence phase screen
power spectrum inversion
underwater optical communication
orbital angular momentum
