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Leveraging the orthogonality of Zernike modes for robust free-space optical communication
Communications Physics ( IF 5.5 ) Pub Date : 2020-11-06 , DOI: 10.1038/s42005-020-00468-1
Santanu Konwar , Bosanta R. Boruah

Free-space optical communication systems exploit the properties of light beams to transfer information through a free-space link. Indeed such systems provide an exciting alternative for communication. Here we introduce information transfer through free-space using a laser beam having its phase encoded with multiple orthogonal aberration modes. We use Zernike polynomials, which form a complete basis set, to represent the aberration modes. The user information is converted to co-efficients of the Zernike modes which are summed digitally to obtain the resultant phase profile. A single phase modulating device then reads the resultant phase to shape the wavefront of the beam to be transmitted. The receiving station estimates the co-efficients of all modes in the beam from a single measurement of a wavefront sensor, to retrieve the user information. We demonstrate data transfer using multiple modes, each with multiple strengths, and external perturbation compensation using the completeness property of the modes.



中文翻译:

利用Zernike模式的正交性实现健壮的自由空间光通信

自由空间光通信系统利用光束的特性通过自由空间链路传输信息。实际上,这样的系统为通信提供了令人兴奋的选择。在这里,我们介绍使用激光束通过自由空间进行信息传递,该激光束的相位已通过多个正交像差模式进行了编码。我们使用形成完整基集的Zernike多项式来表示像差模式。用户信息被转换为Zernike模式的系数,将这些系数进行数字求和以获得最终的相位曲线。然后,单相调制设备读取所得相位,以对要传输的光束的波阵面进行整形。接收站从波前传感器的一次测量中估计光束中所有模式的系数,以检索用户信息。

更新日期:2020-11-06
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