This paper demonstrates the effect of haze condition on free space optical (FSO) communication and to thin out the attenuation effects. The effects in the main focus on the atmospheric attenuation effects due the visibility and link range (length). Visibility is the main concern in utilizing the FSO communication system. The higher visibility, the longer transmission link. Hence, FSO performance could be enhanced and increased efficiency by using different wavelengths of laser beam. The conventions generally used wavelengths are 785 nm, 850 nm, and 1550 nm. The analysis result shows that the wavelength 1550 nm is better than 785 nm and 850 nm due to the less attenuation performance. Wavelength 1550 nm had improved 33%, 67%, 80% and 100% compared to the wavelength 850 nm and 785 nm due to the visibility and distance of 3 km, respectively. Higher wavelength able to thin out the attenuation effects on FSO links. Wavelength 1550 nm is sufficient enough to penetrate haze dense without giving harm to the eyes.
