  Rising data demands are a growing concern globally. The task at hand is to
evolve current communication networks to support enhanced data rates while
maintaining low latency, energy consumption and costs. To meet the above
challenge, Optical Wireless Communication (OWC) technology is proposed as a
solution to complement traditional Radio Frequency (RF) based communication
systems. Recently, Vertical Cavity Surface Emitting Lasers (VCSELS) have been
considered for data transmission in OWC indoor environments due to their
ability to transmit power through narrow, near-circular beams to receivers. In
this paper, we study the energy efficiency of a VCSEL-based OWC system in an
indoor environment and compare it to that of a Light Emitting Diode (LED) based
system. The main findings show that the VCSEL system performs better and has
higher energy efficiency.
