The crucial element for ensuring secure optical communication lies in the consistent recovery of high-quality messages and validation needs to occur periodically. Semiconductor lasers have proven to be outstanding devices in the role of transceivers. This study delves into optical communication utilizing unidirectionally coupled multimode semiconductor lasers, specifically 3-mode lasers, as both transmitter and receiver. Two types of coupling are examined: global coupling, where the output of transmitter modes connects to corresponding receiver modes, and cross-modal coupling, which introduces a detuning equivalent to the frequency spacing of modes. The research is focused on investigating the impact of the transmission coefficient and bias current on the quality of the transmitted message. In the first coupling scenario, a high-quality message is successfully recovered, whereas the second coupling scheme demonstrates a neutral effect on message recovery quality. Message recovery is shown with an analog signal and a periodic bit sequence.