When we design an optical system, we need to consider that the transmitting power is appropriate to reach the receiving end, if this power is less than required, it will be difficult to separate the data from the noise, which in turn, will causes errors. In this chapter, a new method is presented to improve the received power in wireless optical communications by introducing an adaptive power method that adjusts the amplifier’s power according to weather conditions. The simulation was done using OptiSystem programming environment and MATLAB environment. Results have shown improvement in the received power, bit error rate, quality factor, and eye diagram, in which the quality factor was improved by a rate ranging from 3.6 to 44.45% in different weather conditions.