论文标题
使用自称网络分析和生成多模光场
Analyzing and generating multimode optical fields using self-configuring networks
论文作者
论文摘要
使用有限数量的模式来描述，生成和检测光场在数学上可以经济且物理上有用。这样的模式基础可以直接映射到通信，传感和处理中的各种应用程序。但是，我们需要一种生成和分析此类领域的方法，包括对模态成分的相对振幅和相位的测量和控制。在这里，我们首先展示了如何自动且同时自动测量所有这些相对幅度和相位。该方法使用2x2个块的自配置网络，例如集成的马赫·齐汉（Mach-Zhhnder）干涉仪，该网络可以自动通过一系列简单的单参数功率最小化的序列自动与光场对齐，当网络元素（例如相位变速器）（例如相位变速器）进行调整。然后，从这些元素的结果设置中直接推导光场。我们展示了如何自动和仅使用两个光束来自动校准整个网络。然后，使用相同的校准并向后运行网格，我们还可以控制一个任意的多模字段。给出了用于操作此系统的明确算法和公式。
Working with finite numbers of modes to describe, generate and detect optical fields can be both mathematically economical and physically useful. Such a modal basis can map directly to various applications in communications, sensing and processing. But, we need a way to generate and analyze such fields, including measurement and control of both the relative amplitudes and phases of the modal components. Here, we show first how to measure all those relative amplitudes and phases automatically and simultaneously. The method uses a self-configuring network of 2x2 blocks, such as integrated Mach-Zehnder interferometers, that can automatically align itself to the optical field by a sequence of simple one-parameter power minimizations when network elements, such as phase shifters, are adjusted. The optical field is then directly deduced from the resulting settings of those elements. We show how the entire network can be calibrated for such measurements, automatically and with just two light beams. Then, using the same calibration and running the mesh backwards, we can also controllably generate an arbitrary multimode field. Explicit algorithms and formulas are given for operating this system.
