Petahertz communication: Harmonizing optical spectra for wireless communications

With the rapid deployment of Next-Generation Networks (NGN), research community has initiated discussions on an entirely new suite optical enabling techniques. To pave way for development future wireless networks, this article aims to unify existing infrared, visible light, and ultraviolet subbands while also exploring potential Petahertz (PHz) band support extremely bandwidth-thirsty telepresence style applications. Our focus is emerging Communication (PetaCom) framework, scenario-dependent propagation channels, modulation schemes, system performance, multiple access techniques, networking. We conclude with a range PetaCom challenges open issues.