PERFORMANCE INVESTIGATIONS OF 40 GB/S ORBITAL ANGULAR MOMENTUM MULTIPLEXED FREE SPACE OPTICS TRANSMISSION SYSTEM UNDER WEATHER TURBULENCE
Keywords:
Free space optical (FSO), Orbital angular momentum (OAM), and Transmission diversitynon return to zero/return to zero (TD- NRZ / RZ)Abstract
In this paper, a design of 40 Gb/s free space optics (FSO) transmission link is proposed employing orbital angular momentum (OAM) multiplexing technique under the different weather turbulence such as clear sky, rain, fog, haze and dust. The system has four channels comprised of OAM multiplexed laser beams such as LG0,0, LG0,13, LG0,40, LG0,80, for realization free space transmission. It has been observed that Interchannel interference is a performance deteriorating constraint is in multi-channel OAM multiplexed FSO systems. To suppress of inter-channel interference a transmitter diversity NRZ/RZ formatting technique has been incorporated. A graphically representation of performance comparison is established considering return-to-zero (RZ), alternate mark inversion (AMI), non-return-to zero (NRZ) and transmitter Diversity- (TD)-NRZ/RZ modulation signal encodings in terms of bit error rate (log BER). The Results revealed that the system performance is better with TD-NRZ/RZ encoding compared to other techniques and it covers a transmission range from 67 to 1200 m depending upon the weather conditions.
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