研究目的
Investigating the application of multi-core fiber (MCF) optical fronthaul in multi-antenna systems for 5G communications, focusing on MIMO and beamforming capabilities.
研究成果
The experimental results confirm the suitability of MCF media for multi-antenna MIMO systems and photonic beamformers in 5G communications. The proposed MCF fronthaul and photonic TTD chip enable efficient MIMO transmission and beam-steering, demonstrating potential for future 5G deployments.
研究不足
The study is limited to a 4-core fiber and a 4-antenna system, while 5G deployments may require more antenna elements. The scalability to higher-density MCFs and the integration of semiconductor amplifiers for larger phased-array antennas are potential areas for optimization.
1：Experimental Design and Method Selection:
The study evaluates the performance of MCF in supporting 4×4 MIMO transmission and 4×1 beamforming in 5G multi-antenna systems. It employs a commercially available 4-core fiber and a Si3N4 photonic chip based on optical ring resonators (ORRs) for beam-steering.
2：Sample Selection and Data Sources:
A fully compliant 3GPP LTE-A signal is generated and evaluated using a wireless test set. The study also uses single-carrier signals with varying bandwidths for beamforming evaluation.
3：List of Experimental Equipment and Materials:
Includes a distributed feedback laser (DFB), Mach-Zehnder (MZ) electro-optical modulators, a 4-core fiber (Fibercore SM-4C1500(8.0/125)), PIN photodetectors, and a Si3N4 photonic chip with ORRs.
4：0/125)), PIN photodetectors, and a Si3N4 photonic chip with ORRs. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The setup involves modulating LTE-A data on an optical carrier, transmitting through the MCF, and detecting with PIN photodetectors. Beamforming is achieved by tuning the time delay applied to each antenna element via the ORRs.
5：Data Analysis Methods:
Performance is evaluated based on error vector magnitude (EVM) and signal-to-noise ratio (SNR) measurements, with comparisons to 3GPP recommendations.
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Optical tunable filter
OTF-950
Santec
Ensures optical single side band (SSB) operation with a 1.2-nm bandwidth.
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4-core fiber
SM-4C1500(8.0/125)
Fibercore
Enables simultaneous transmission of different optical data streams at the same wavelength by spatial multiplexing for MIMO signals and beamforming by transmitting the same optical data signal with different phase or time delays to each antenna element.
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Si3N4 photonic chip
Based on optical ring resonators (ORRs) for continuous and centralized tuning of the time delay applied to each antenna element in beam-steering applications.
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Distributed feedback laser
DFB
Generates continuous-wave light at 1555.75 nm for optical carrier in the experimental setup.
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Mach-Zehnder electro-optical modulator
MZ
Modulates LTE-A data on the optical carrier at the quadrature bias point.
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PIN photodetector
PIN
Used for direct detection of the optical signals at reception.
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Erbium doped fiber amplifier
EDFA
Amplifies the filtered signal in the beamforming experimental setup.
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