论文标题
单发kramers-kronig复合轨道角动量谱检索
Single-shot Kramers-Kronig complex orbital angular momentum spectrum retrieval
论文作者
论文摘要
轨道角动量（OAM）频谱诊断是基于OAM的系统的基本基础。除其他外，简单的轴上干涉测量可以在几镜头中检索复杂OAM光谱的幅度和相信息。然而，由于测量中固有的信号信号节拍干扰，它的单发检索仍然是虚幻的。在这里，我们在连贯的通信中介绍了Kramers-Kronig（KK）接收器的概念，向OAM域介绍，从而实现了严格的单次OAM光谱测量。我们详细解释了工作原理和KK方法的要求，然后将技术应用于精确衡量各种特征的OAM状态。此外，我们讨论了载体与信号功率比的影响以及对严格检索必不可少的采样点的数量，并评估在大量随机OAM光谱和高维空间上的性能。单发KK干涉法显示了实时表征复杂OAM态的巨大潜力。
Orbital angular momentum (OAM) spectrum diagnosis is a fundamental building block for diverse OAM-based systems. Among others, the simple on-axis interferometric measurement can retrieve the amplitude and phase information of complex OAM spectra in a few shots. Yet, its single-shot retrieval remains illusive, due to the signal-signal beat interference inherent in the measurement. Here, we introduce the concept of Kramers-Kronig (KK) receiver in coherent communications to the OAM domain, enabling rigorous, single-shot OAM spectrum measurement. We explain in detail the working principle and the requirement of the KK method, and then apply the technique to precisely measure various characteristic OAM states. In addition, we discuss the effects of the carrier-to-signal power ratio and the number of sampling points essential for rigorous retrieval, and evaluate the performance on a large set of random OAM spectra and high-dimensional spaces. Single-shot KK interferometry shows enormous potential for characterizing complex OAM states in real-time.
