COMPARATIVE INVESTIGATION OF VISIBLE TO SWIR LASERS FOR TERRESTRIAL FSO LINK ANALYSIS UNDER VARIOUS METEOROLOGICAL CIRCUMSTANCES
Abstract
This paper compares coherent optical sources operating in the visible to short wavelength infrared (SWIR) spectral bands at various wavelengths, such as lasers operating in longer-range terrestrial free space optical links under varying atmospheric circumstances. For the link range of five kilometers, different laser sources have been taken into consideration in this comparison research. For instance, two visible wavelengths (532 nm, 640 nm), two near infrared wavelengths (NIR) (808 nm, 980 nm), and one short wavelength infrared (SWIR) (1550 nm) have all been discussed. Additional characteristics include a 100 MHz data transmission frequency and Return to Zero On-Off Keying (RZ-OOK) modulation technique. Fog, rain, snow, turbulence, and other atmospheric phenomena have a significant impact on the terrestrial FSO link. Thus, in order to retain dependable connection performance and recover the conveniently supplied information in inclement weather, transmitted optical power is a crucial requirement. Other parameters like optical power attenuation, signal to noise ratio (SNR), bit error rate (BER), etc. have been analyzed at the receiver end using proper optics for each wavelength at a distance of 5 km in various adverse atmospheric conditions. From the link analysis computation, it has been revealed that the link margin for 1550 nm, 980 nm, 808 nm, 640 nm, and 532 nm Lasers are about 63.1 dB, 60.6 dB, 59 dB, 57 dB, and 56 dB respectively for 5 km link range at adverse atmospheric scenario.
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