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Investigating the impact of modulation peak current in improving the performance of OFDM-RoF system-based VCSEL for 5G system

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Abstract

The orthogonal frequency division multiplexing (OFDM) system and coherence detection are seen as a promising technology that increases the speed of digital data transmission in radio over fiber (RoF) technology. This groundbreaking research combines an OFDM RoF system, coherent optical detection, and a vertical cavity surface emitting laser (VCSEL) with external optical modulations. Prior until recently, OFDM RoF used optical sources like Continuous-Wave lasers (CW lasers). A specific modulation peak current selection is used in the design of the proposed OFDM RoF-VCSEL to enhance system performance. Data signals with different bit rates are mapped by M-QAM encoders before being converted to OFDM signals. In the same setup, a CW-laser is utilized in lieu of the VCSEL to compare the transmitted signal characteristics of the two types of VCSELs: the OFDM RoF-based VCSEL and the conventional VCSEL. The proposed system of an OFDM-based VCSEL with 4-QAM effectively allowed transmission lengths of up to 13,000 km with 10 Gbps and 2,000 km with 20 Gbps. The simulation of the constellation points of the OFDM RoF-based VCSEL are still reasonably clear and detectable up to transmission of 13,000 km, in contrast to the OFDM RoF-based CW-laser system, where the constellation points are disturbed, indicating a significant level of signal–noise interference. Furthermore, the modulation peaks current (of the VCSEL-based device) optimal value selection at 3 mA greatly impairs the performance of the recovered signal. It is important to note that the simulation was run using the Optisystem 17 program.

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Authors and Affiliations

  1. Department of Physics, College of Science, Salahaddin University-Erbil, Erbil, KRG, Iraq

    Raghad Zuhair Yousif Al-Maqdici & Sevan H. Ali

  2. Department of Computer Engineering, College of Engineering, Knowledge University, Erbil, 44001, Iraq

    Raghad Zuhair Yousif Al-Maqdici

  3. Department of Computer Technical Engineering, Al-Qalam University College, Kirkuk, Iraq

    Sirwan Kareem Jalal

  4. Information and Communication Technology ICTE Department, Erbil Polytechnic University, 120Meter, Erbil, Iraq

    Sevan H. Ali

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  1. Raghad Zuhair Yousif Al-Maqdici
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  2. Sirwan Kareem Jalal
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  3. Sevan H. Ali
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Correspondence to Raghad Zuhair Yousif Al-Maqdici.

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Al-Maqdici, R.Z.Y., Jalal, S.K. & Ali, S.H. Investigating the impact of modulation peak current in improving the performance of OFDM-RoF system-based VCSEL for 5G system. J Opt (2024). https://doi.org/10.1007/s12596-024-01656-w

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  • DOI: https://doi.org/10.1007/s12596-024-01656-w

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