(Solved): For an underwater optical wireless communication system, the following data is given: Transmitted p ...

For an underwater optical wireless communication system, the following data is given: Transmitted power $=2$ watts, optical efficiency of the transmitter $=0.8$, optical efficiency of the receiver $=0.9$, total extinction coefficient $=0.04{\mathrm{m}}^{-1}$, perpendicular distance between the transmitter plane and the receiver plane $=15\mathrm{m}$, transmittance beam divergence angle $=30^{\circ }$, angle between the perpendicular to the receiver plane and the transmitter-receiver trajectory $=0^{\circ }$ and the receiver aperture area $=3{\mathrm{cm}}^2$. a. Find the received optical power in $\mu$ watt, using Beer's Law. b. For the underwater optical system described above, find the received optical power in $\mu$ watt, under line-of-sight (LOS) conditions. Why is this result different when compared to the result found in part (a) above?