Analytical Noise-Variance Assessment of Receiver-Side Optical Filtering for Background-Noise Mitigation in Free-Space Optical Communication under Atmospheric Turbulence
DOI:
https://doi.org/10.4108/tsoe.14376Keywords:
Free-space optical communication, Optical filtering, Noise variance, Atmospheric attenuation, Intelligent transportation systems, Maritime communicationsAbstract
Receiver-side optical filtering trades useful-signal attenuation against noise suppression in free-space optical communication. We analyse a 40 Gbps, 1.54 km OptiSystem link at 1552.52 nm using six filter responses. A normalized variance metric combines received power and signal-to-noise ratio. IIR, Gaussian and Bessel responses increase Q from 6.94 to 8.81–8.94 and signal-to-noise ratio from 16.83 to 18.90–19.03 dB. Under a fixed-gain signal-power interpretation, the inferred effective variance decreases by 45.81–46.50%; the individual background-noise contribution is not identified. Error rates near 10⁻¹⁹ are analyzer estimates. We clarify the fixed-loss channel assumption, derive a filter-benefit condition, and discuss hardware, adaptive selection, and potential transport and maritime applications. Outdoor validation and recovery of the original filter settings remain necessary.
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[1] Ho VC, Huynh LT, Koboević Ž. UAV-Assisted MOSI/SOMI MIMO-FSO Relay for Resilient Transport Communication Links. Automation. 2026;7(4):107. doi:10.3390/automation7040107.
[2] Andrews LC, Phillips RL, Hopen CY. Laser Beam Scintillation with Applications. Bellingham: SPIE Press; 2001. doi:10.1117/3.412858.
[3] Jahid A, Alsharif MH, Hall TJ. A contemporary survey on free space optical communication: Potentials, technical challenges, recent advances and research direction. J Netw Comput Appl. 2022;200:103311. doi:10.1016/j.jnca.2021.103311.
[4] Alimi IA, Monteiro PP. Revolutionizing Free-Space Optics: A Survey of Enabling Technologies, Challenges, Trends, and Prospects of Beyond 5G Free-Space Optical (FSO) Communication Systems. Sensors. 2024;24(24):8036. doi:10.3390/s24248036.
[5] Abdelfatah R, Alshaer N, Ismail T. A review on pointing, acquisition, and tracking approaches in UAV-based fso communication systems. Opt Quantum Electron. 2022;54:571. doi:10.1007/s11082-022-03968-2.
[6] International Telecommunication Union. Prediction methods required for the design of terrestrial free-space optical links. Recommendation ITU-R P.1814-1. Geneva: ITU; 2025. Available from: https://www.itu.int/rec/R-REC-P.1814-1-202509-I.
[7] Luu H-M. Study on IoT application and development of artificial neural networks in vehicle status diagnosis. EAI Endorsed Trans on Trans and OE. 2025;1(1). doi:10.4108/tsoe.10848.
[8] Dang X-K, Do V-D, Nguyen N-T, Ly S. Integrating model predictive control with deep learning for sway reduction in ship-to-shore crane operations. EAI Endorsed Trans on Trans and OE. 2025;1(1). doi:10.4108/tsoe.10838.
[9] Al-Sallami F, Rajbhandari S, Ata Y. FSO Basics. In: Handbook of Radio and Optical Networks Convergence. Singapore: Springer; 2024. p. 815–859. doi:10.1007/978-981-97-2282-2_54.
[10] Kaushal H, Jain VK, Kar S. Free Space Optical Communication. New Delhi: Springer; 2017. doi:10.1007/978-81-322-3691-7.
[11] Henniger H, Wilfert O. An introduction to free-space optical communications. Radioengineering. 2010;19(2):203-212.
[12] Celik A, Shihada B, Alouini MS. Optical wireless data center networks: potentials, limitations, and prospects. In: Broadband Access Communication Technologies XIII. Bellingham: SPIE; 2019. doi:10.1117/12.2507643.
[13] Ho VC, Nguyen NT. A Proposed Method Determination of the Total Signal to Noise Ratio for Free-Space Optical Communication Using UAV Relaying. In: 2024 International Conference on Advanced Technologies for Communications (ATC). IEEE; 2024. p. 339–345. doi:10.1109/ATC63255.2024.10908114.
[14] Kim II, McArthur B, Korevaar EJ. Comparison of laser beam propagation at 785 nm and 1550 nm in fog and haze for optical wireless communications. Proc SPIE. 2001;4214:26–37. doi:10.1117/12.417512.
[15] Khan R, Khattak RW, Khan MS, Mushtaq MT. Analysis of optical attenuation from measured visibility data in Islamabad, Pakistan. Mehran Univ Res J Eng Technol. 2018;37(2):269–278. doi:10.22581/muet1982.1802.04.
[16] Popoola WO, Ghassemlooy Z. BPSK subcarrier intensity modulated free-space optical communications in atmospheric turbulence. Journal of Lightwave Technology. 2009;27(8):967-973. doi:10.1109/JLT.2008.2004950.
[17] ITU-T. Optical interfaces for intra-office systems. Recommendation G.693. Geneva: International Telecommunication Union; 2005.
[18] ITU-T. Optical transport network physical layer interfaces. Recommendation G.959.1. Geneva: International Telecommunication Union; 2024.
[19] Kaushal H, Jain VK, Kar S. Ground-to-satellite optical communication link performance with spatial diversity in weak atmospheric turbulence. Fiber Integr Opt. 2010;29(4):315–340. doi:10.1080/01468030.2010.491893.
[20] Mofidi M, Chaman-Motlagh A. Error and channel capacity analysis of SIMO and MISO free-space optical communications. In: 20th Iranian Conference on Electrical Engineering (ICEE). IEEE; 2012. p. 1414–1418. doi:10.1109/IranianCEE.2012.6292580.
[21] Thorlabs. Optical systems: laser line filters [Internet]. [cited 2026 Sep 25]. Available from: https://www.thorlabs.com/catalogpages/842.pdf.
[22] Fernandes MA, Monteiro PP, Guiomar FP. Free-space terabit optical interconnects. J Lightwave Technol. 2022;40(5):1519–1526. doi:10.1109/JLT.2021.3133070.
[23] Mufutau AO, Guiomar FP, Fernandes MA, Lorences-Riesgo A, Oliveira A, Monteiro PP. Demonstration of a hybrid optical fiber–wireless 5G fronthaul coexisting with end-to-end 4G networks. J Opt Commun Netw. 2020;12(3):72–78. doi:10.1364/JOCN.382654.
[24] Dat PT, Yamaguchi Y, Motoya M, Oikawa S, Ichikawa J, Kanno A, et al. Transparent Fiber–Millimeter-Wave–Fiber System in 100-GHz Band Using Optical Modulator and Photonic Down-Conversion. J Lightwave Technol. 2022;40(5):1483–1493. doi:10.1109/JLT.2022.3141058.
[25] Dat PT, Morohashi I, Sekine N, Kanno A, Yamamoto N, Akahane K. Fiber–terahertz–fiber bridge system in the 355-GHz band using a simple optical frequency comb and a photonics-enabled receiver. Opt Lett. 2023;48(8):2190–2193. doi:10.1364/OL.486850.
[26] Wong YK, Idrus SM, Ghani IA. Performance analysis of the OFDM scheme for wireless over fiber communication link. Int J Comput Theory Eng. 2012;4(5):807–811. Available from: https://www.ijcte.org/papers/583-A827.pdf.
[27] Al-Gailani SA, Mohd Salleh MF, Salem AA, Shaddad RQ, Sheikh UU, Algeelani NA, et al. A survey of free space optics (FSO) communication systems, links, and networks. IEEE Access. 2021;9:7353–7373. doi:10.1109/ACCESS.2020.3048049.
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