  Exploiting light beams to carry information and deliver power is mooted as a
potential technology to recharge batteries of future generation Internet of
things (IoT) and Internet of underwater things (IoUT) devices while providing
optical connectivity. Simultaneous lightwave information and power transfer
(SLIPT) has been recently proposed as an efficient way for wireless power
transfer between communicating terminals. In this article, we provide an
overview of the various SLIPT techniques in time, power, and space domains. We
additionally demonstrate two SLPIT scenarios through underwater channels.
Moreover, we discuss the open issues related to the hardware as well as system
deployment in harsh environments.
