Before revision:  The usage of channelrhodopsin molecules, able to receive FRET signals and convert them into voltage, is proposed. The communication system is modelled with molecular structures and spectral characteristics of the proposed molecules and further validatedby using Monte Carlo computer simulations, calculating the data throughputand the bit error rate  .
After revision:  The usage of channelrhodopsin molecules, able to receive FRET signals and convert them into voltage, are suggested. Further, medical in-body systems where both molecule types might be successfully applied, are discussed. Luciferase-channelrhodopsin communication is modeled and its performance is numerically validated, reporting on its throughput, bit error rate .