Propagation Studies in Free Space Using RZ and NRZ Optical Links Under Atmospheric Turbulence


  • K Sony
  • K Sarat Kumar
  • K CH. Sri Kavya



Attenuation, BER (Bit error rate), FSO(Free space optics), WDM(Wavelength division multiplexing), Quality Factor.


Free Space optics provides a solution for the growing bandwidth requirements of internet applications. It offers a better solution for bottleneck problems of connectivity but faces a major problem due to atmospheric effects such as Haze, Fog, Snow, Rain. The work modeled  here deals about providing a system designed for the FSO link which can offer efficient  transmission of data up to 3km considering the influence of Fog while transmission with better Quality factor and minimum Bit error Rate  and also does a comparative analysis of two system designs of FSO with a single source and with array of lasers at operating wavelength of 850 nm  using the Wavelength Division Multiplexing  with both RZ and NRZ Formats.



[1] Sony,K. Modelling the systems for improvised performance in FSO Networks,Journal of advanced research in dynamical and control systems,Volume 9,Issue Special Issue 14,2017,Pages 2627-2636.

[2] Keiser, G., optical fiber communications, McGrawHill Company, 2000.

[3] Keiser, G., optical essential communications, McGraw-Hill Company, 2004

[4] Agrawal, G. P., Fiber-Optic communication system, John Wiley and Sons, 4th edition, 2010.

[5] Majumdar, A., Free-Space Laser Communications: Principles and Advanced, springer science+business media, LLC, 2008

[6] Lubna Nadeem, Performance of FSO Links using CSRZ, RZ, and NRZ and Effects of Atmospheric Turbulence, J. Opt. Commun. 2017, DOI 10.1515/joc-2016-0113.

[7] Kaur A, Sheetal A. Performance analysis of 16 × 2.5GB/s FSO system for the most critical weather conditions. Int J Adv Res Comput Commun Eng 2015 May;4(5):612–8.

[8] Chawla A, Mishra S, Aarthi G. Simulation research of free-space optical communication based on linear polarization shift keying modulation. ARPN J Eng Appl Sci 2015 Aug;10(14):6116–20.

[9] Jia W, Matsui Y, Mahgerefteh D, Lyubomirsky I, Chan CK. Generation and transmission of 10-Gbaud optical 3/4-RZDQPSK signals using a chirp-managed DBR laser. J Lightwave Technol 2012;30(21):3299–305.

[10] Zhou X, Nelson LE, Isaac R, Zhu B, Peckham DW, Borel PI, et al.. PDM-Nyquist-32QAM for 450 Gb/s per-channel WDM transmission on the 50 GHz ITU-T grid. J Lightwave Technol 2012 Feb;30(4):553–9.

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