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This article numerically investigates the effect of absorption and scattering loss in the presence of underwater. Presenting optical wireless channel, system is considered for fundamental mode (LP01) and its higher order modes (LP11, LP21 & LP31). The system performance is examined in terms of bit error rate (BER) with the function of wavelength, distance, attenuation and beam divergence. This implementation also shows the optimized results with respect to spatial mode matching component using spatial aperture and collimating lens as well. The graded results producing the new sight and will have greater attention among the optical wireless technology. The overall analysis of system design promises for better performance even at the treaty of high attenuation loss 49.34 dB/m on the propagation of all spatial modes. Each results obtained in this paper reaches the stability at the greater attenuation with the wavelength range from 1000 nm to 1600 nm. Keywords: Absorption, Scattering loss, BER, Attenuation, Underwater