Demonstration of 256 QAM 10 Gbps Signal Transmission over 570 km Fiber-based NG Radio over Fiber System

Deen, Hasan k. Al; Abd, Haider J.

doi:10.1590/2179-10742024v23i3280455

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Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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Article • J. Microw. Optoelectron. Electromagn. Appl. 23 (3) • 2024 • https://doi.org/10.1590/2179-10742024v23i3280455 copy

Demonstration of 256 QAM 10 Gbps Signal Transmission over 570 km Fiber-based NG Radio over Fiber System

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The rapid development of the Fifth Generation (5G) networks encourages researchers to improve the Radio over Fiber (RoF) technique to achieve data rates of 10 Gbps and beyond. That led to a significant increase in bandwidth and range while reducing latency and cost. This paper evaluates an Analog Radio over Fiber (ARoF) technique compatible with Next-Generation (NG) long-haul communication systems, aiming for simplicity and lower cost. Transmitting a 28 GHz, 256 Quadrature Amplitude Modulation (QAM) signal through Single-Mode Fiber (SMF) is possible by modulating it through two parallel Mach-Zehnder Modulators (MZM), allowing signal reception over long distances. The Error Vector Magnitude (EVM) appraises performance of the system. The simulation results indicate that the prototype can transfer data at 10 Gbps through the optical link up to 570 km with an EVM of 3.375% and received optical power of 4.015 dBm. The proposed system supports a high bit rate and maintains the EVM within 3GPP limits, making it superior to peer publications and highly appropriate for NG long-haul communication systems.

Index Terms
Analog Radio Over Fiber; Centralized Radio Access Networks; Error Vector Magnitude; Quadrature Amplitude Modulation.

Parameter	Value
Bit rates	10 Gbit/s
Carrier Frequency	28 GHz
MZM Extinction Ratio	10 dB
Laser wavelength	1550 nm
Modulation	256 QAM
APD-PD gain	5
Sample per bit	16
Fiber attenuation	0.2dB/ km

Ref.	Modulation	Fiber length km	EVM %	Carrier frequency GHz	Optical modulation type	Data rate Gbps
proposed method	256 QAM	570	3.375	28	External	10
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[¹⁷[17] C. Y. Wu et al., “Real-Time 4× 3.5 Gbps Sigma Delta Radio-over-Fiber for a Low-Cost 5G C-RAN Downlink,” in European Conference on Optical Communication (ECOC), Institute of Electrical and Electronics Engineers Incorporated, 2018, pp. 1-3. doi: 10.1109/ECOC.2018.8535235. https://doi.org/10.1109/ECOC.2018.853523... ]	256 QAM	20	2.67	3.5	Direct	3.5
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[²⁷[27] H. Li et al., “Real-Time 100-GS/s Sigma-Delta Modulator for All-Digital Radio-Over-Fiber Transmission,” Journal of Lightwave Technology, vol. 38, no. 2, pp. 386-393, 2020, doi: 10.1109/JLT.2019.2931549. https://doi.org/10.1109/JLT.2019.2931549... ]	256 QAM	10	3.13	27.5	EAM	100-GS/s
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