Abstract: This study presents the attenuation evaluation for optical wireless communication link measurements under various bit rates. From the numerical analysis, it has been found that 155 Mbps is the most suited bit rate to enhance the performance of the system regarding attenuation effect on the link compared to bit rate 622 Mbps and 2.5 Gbps. It enhanced the system by 4 and 48% compared to the other two bit rates. The system performance is proven better using lower bit rate links for communication. Higher bit rate system is usable but the communication system tends to be less functional for transmission links.