This paper reviews the foundations of the Kramers–Kronig (KK) receiver, a recently proposed scheme designed to reconstruct a complex-valued signal from the measurement of its intensity in the context of fiber-optic communications. We provide a comprehensive characterization of the signal properties that are required for the proper operation of the KK receiver and discuss the most relevant implementation requirements, such as the need for digital up-sampling, the implications of receiver imperfections, line chromatic dispersion, optical filtering, and polarization multiplexing.

中文翻译：

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Kramers–Kronig接收器

本文回顾了Kramers-Kronig（KK）接收器的基础，该接收器是最近提出的一种方案，旨在通过在光纤通信的情况下通过测量强度来重建复数值信号。我们提供了KK接收机正常运行所需的信号特性的全面表征，并讨论了最相关的实现要求，例如对数字上采样的需求，接收机缺陷的影响，线色散，光学滤波和极化多路复用。