Performance Enhancement of 1.2 Tbps Coherent DP-QPSK DWDM-FSO System Using Hybrid EDFA/EYDFA Optical Amplification Under Atmospheric Turbulence
DOI:
https://doi.org/10.65405/r1zb4314Keywords:
FSO, DWDM, DP-QPSK, Hybrid Optical Amplifier, EDFA, EYDFA, Coherent Detection, BER, Q-factorAbstract
The increasing demand for ultra-high-speed communication systems has created significant challenges for Free-Space Optical (FSO) networks, particularly due to atmospheric impairments such as turbulence, attenuation, and signal degradation. Moreover, conventional modulation techniques such as Non-Return-to-Zero (NRZ) suffer from limited spectral efficiency, restricting the achievable transmission capacity. To address these challenges, this paper proposes a high-capacity coherent Dense Wavelength Division Multiplexing Free-Space Optical (DWDM-FSO) system based on Dual-Polarization Quadrature Phase Shift Keying (DP-QPSK) modulation and hybrid Erbium-Doped Fiber Amplifier/Erbium-Ytterbium Co-Doped Fiber Amplifier (EDFA/EYDFA) optical amplification. The proposed system achieves an aggregate transmission capacity of 1.2 Tbps using twelve wavelength channels, each operating at 100 Gbps. DP-QPSK enhances spectral efficiency by utilizing both phase and polarization multiplexing, while coherent detection with Digital Signal Processing (DSP) improves receiver sensitivity and compensates for atmospheric-induced phase and frequency distortions. The system performance is evaluated using received optical power, Signal-to-Noise Ratio (SNR), Q-factor, Bit Error Rate (BER), and constellation diagrams under different atmospheric conditions. The results demonstrate that the proposed architecture significantly improves transmission capacity, spectral efficiency, and link reliability compared with conventional NRZ-based FSO systems
Downloads
References
[1] H. M. Obaid et al., “Performance analysis of a hybrid optical amplifier based 480-Gbps DWDM-FSO system,” Frontiers in Computer Science, 2024. [2] A. Jahid et al., “Free space optical communication survey,” Journal of Network and Computer Applications (JNCA).
[3] S. Seenivasan et al., “1000 Gbps MDM-WDM FSO link employing DP-QPSK modulation scheme under the effect of fog,” Optik, vol. 251, 2022.
[4] J. Kaur and R. Kaur, “Investigation of RS-code DP-QPSK enabled FSO communication link under various atmospheric conditions,” in Proc. IEEE International Conference on Computing, Power and Communication Technologies (GUCON), 2022.
[5] M. F. Al-Mashhadani et al., “Numerical evaluation of bidirectional high-speed data transmission over turbulence tolerable FSO link employing WDM-OAM multiplexing and DP-QPSK modulation,” Optics Communications, vol. 546, 2023.
[6] P. Pishgam et al., “Performance enhancement of two-stage erbium-ytterbium co-doped fiber amplifiers using wavelength-selective reflective feedback loop,” Optical and Quantum Electronics, vol. 58, 2026.
[7] S. T. Hayle et al., “5G sub-6 GHz/MMW wireless convergence with fiber-FSO for JRC systems,” Optics Communications, vol. 570, 2026.
[8] Azouz, A., Fawzi, M., Mohammed, I., Hamed, O., Maher, A., & Baddi, M. (2026). Influence of Electrolyte Chemistry and Electrode Material on Hydrogen Production Performance in Alkaline Water Electrolysis. Al-Farooq Journal of Sciences, 2(2), 49-66.
[9] A. K. S. Seenivasan, “Performance evaluation of 6.4 Tbps dual polarization quadrature phase shift keying Nyquist-WDM superchannel FSO transmission link: Impact of different weather conditions,” Journal of Optical Communications, vol. 41, no. 3, pp. 251-260, 2020.
[10] S. Gupta and R. Kaur, “Performance analysis of DP-QPSK based FSO systems under different weather conditions,” in Proc. IEEE International Conference on Advanced Communications and amplifiers for multichannel WDM system,” Optik, vol. 127, no. 1, pp. 445-449, 2016.
[11] Alriheebi, R. A. (2026). Integrated Modeling and Mult objective Control of Multilevel DC/AC Inverters for Conducted Electromagnetic Interference Mitigation. Al-Farooq Journal of Sciences, 2(3), 897-925.
