Emulating atmospheric turbulence effects on a micro-mirror array: assessing the DMD for use with free-space-to-fibre optical connections
Emulating atmospheric turbulence effects on a micro-mirror array: assessing the DMD for use with free-space-to-fibre optical connections
复制标题
DOI：
10.1088/2631-8695/ac7d49
复制
发表时间：
2022-06
影响因子：
1.7
通讯作者：
D. Benton;A. Ellis;Yiming Li;Zhuyi Hu
中科院分区：
文献类型：
--
作者：
D. Benton;A. Ellis;Yiming Li;Zhuyi Hu
由一组22个Zernike模式构成的模拟大气湍流效应已写入作为二进制振幅空间光调制器的DMD阵列。已经产生了具有受控湍流量的畸变帧的序列，并且可以在可以超过1kHz速率的受控速率下操作，这可以在强湍流中看到。在这种情况下，选择400 Hz，并在接收器处用单模、多模和多模光纤观察相同湍流序列的闪烁水平。产生的闪烁水平与标准湍流模型一致。增加接收强度和减少闪烁观察到较大的核心纤维和相关的像差引起的焦点大小。接收到的强度变化和单个泽尼克模式的振幅变化之间的相关性具体地证明了当聚焦到接收光纤中时大气引起的光束漂移的效果。因此，DMD被证明能够产生必要的频率内容和范围的闪烁所需的大气仿真。
Emulated atmospheric turbulence effects constructed from a set of 22 Zernike modes have been written upon a DMD micromirror array operating as a binary amplitude spatial light modulator. Sequences of aberrated frames with controlled amounts of turbulence have been produced and can be operated at controlled rates that can exceed 1 kHz rates which can be seen in strong turbulence. In this case 400 Hz was chosen and the scintillation levels observed for the same turbulence sequence with single, few and multi-mode fibres at a receiver. Resulting scintillation levels are consistent with standard turbulence models. Increased received intensity and reduced scintillation was observed with larger core fibres and related to aberration-induced focal spot size. Correlation between the received intensity variation and the amplitude variations for individual Zernike modes demonstrates specifically the effect of atmospheric induced beam wander when focusing into a receive fibre. The DMD is thus shown to be able to generate both the necessary frequency content and range of scintillation required for atmospheric emulation.