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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science
Ahmed Nabih Zaki Rashed
Menoufia University
Computer Science & IT Electrical & Electronics Engineering

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Journal : TELKOMNIKA (Telecommunication Computing Electronics and Control)

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Raised cosine/NRZ line coding techniques for upgrading free space optical communication systems through various levels of fog Aadel M. Alatwi; Ahmed Nabih Zaki Rashed
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 6: December 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i6.16236

Abstract

This study examines raised cosine/NRZ line coding techniques for upgrading free space optical (FSO) communication systems through various levels of fog.The max. Q factors are simulated and estimated for clear air, light fog, and moderate fog weather conditions at a data rate of 20 Gb/s. The optical signal to noise ratio is also measured for different weather conditions. The total power after both FSO channel and avalanche photodiode (APD) photo-detector receiver is estimated by an optical power meter for max. distances.The study shows that the max. propagation distance is extended to 50 kmthrough clear air, 2.25 km through light fog, and 1.6 km through moderate fog with acceptable max. Q factor
High speed modulated wavelength division optical fiber transmission systems performance signature Aadel M. Alatwi; Ahmed Nabih Zaki Rashed; Ismail A. Abd El Aziz
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 19, No 2: April 2021
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v19i2.16871

Abstract

This study presents modulated-wavelength division radio signals over fiber with mixed modulation techniques in the transmitter stage. Hybrid optical sources are used to achieve optimal performance and enhancement for an optical fiber communication network. The proposed modulation techniques work at a frequency of 250 GHz. Optical quadrature phase shift keying (OQPSK) and phase modulation (PM) techniques were merged to create OQPSKPM. This was in addition to the minimum shift keying (MSK) modulation scheme that was applied in the proposed model. The modulated wavelength division multiplexing design to four subscribers was examined with a single mode optical fiber at a 1550 nm wavelength. The proposed and previous simulation models were executed, investigated and measured on important operating parameter quantities that expressed the behavior of the optical fiber network in detail, like maximum quality factor, minimum bit error rate, and output power. The obtained simulation results demonstrated the priority of the proposed simulation model.
Co-Authors Aadel M. Alatwi Aadel M. Alatwi Aadel M. Alatwi Abd El-Naser A. Mohammed Abd El-Naser A. Mohammed Ahmed M. El-Eraki Alsharef Mohammad Ashraf S. Seliem Hazem M. El-Hageen Iraj Sadegh Amiri Ismail A. Abd El Aziz Mahmoud M. A. Eid Mohamed Yassin Ali Mohammed S. Alzaidi Norah Muhammad Alwadai Preecha Yupapin Shabana Urooj Shaimaa S. Abaza Shobhit K. Patel Sunil Lavadiya Vishal Sorathiya