研究目的
To design and analyze single-carrier 400G unrepeatered optical transmission systems using ROPAs with dedicated delivery fibers, focusing on joint evaluation of BER and OSNR for optimal performance.
研究成果
The proposed design methodology for high-capacity unrepeatered transmission systems, based on joint BER and OSNR evaluation, is effective and validated by experimental results, achieving record distances for single-carrier 400G WDM transmission. Future work could involve extending the model to include more nonlinear effects and reducing implementation costs.
研究不足
The system model does not account for cross-polarization effects, polarization mode dispersion (PMD), and certain nonlinearities like four-wave mixing, which may limit accuracy in some scenarios. The use of dedicated delivery fibers increases cost, and the approach is optimized for specific fiber types and configurations.
1：Experimental Design and Method Selection:
The methodology involves designing unrepeatered systems with ROPAs and dedicated pump delivery fibers, using simulation models to optimize parameters like EDF length and distances.
2：Sample Selection and Data Sources:
Two experimental setups were used: one with 16x400G channels over 403 km and another with 24x400G channels over
3：1 km, employing different fiber types and amplification stages. List of Experimental Equipment and Materials:
4 Includes EDFAs, DRAs, ROPAs, external cavity lasers (ECLs), LiNbO3 DP-IQMs, arbitrary waveform generators (AWGs), balanced photodetectors (BPDs), real-time oscilloscopes, and various optical fibers (e.g., VLA-PSCF, LA-PSCF, LL-SMF).
4：Experimental Procedures and Operational Workflow:
Involves generating WDM signals, amplifying with hybrid amplifiers, transmitting over fiber links, detecting with coherent receivers, and processing with DSP algorithms including FEC.
5：Data Analysis Methods:
BER and OSNR are evaluated using simulation models and compared with experimental measurements, employing techniques like split-step Fourier method for signal propagation and FDTD for amplifier modeling.
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external cavity laser
ECL
Generate optical signals with narrow linewidth for WDM transmission.
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dual-polarization in-phase quadrature modulator
DP-IQM
LiNbO3
Modulate optical signals to generate 16QAM channels.
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arbitrary waveform generator
AWG
Generate electrical signals for modulation.
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balanced photodetector
BPD
Detect optical signals in coherent receivers.
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real-time oscilloscope
Sample electrical signals for off-line DSP.
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erbium doped fiber amplifier
EDFA
Amplify optical signals in various stages of the transmission system.
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distributed Raman amplifier
DRA
Provide distributed amplification using Raman effect.
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remote optically-pumped amplifier
ROPA
Amplify signals remotely using optical pumping.
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optical fiber
VLA-PSCF
Transmit signals with low loss and large effective area to reduce nonlinear effects.
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optical fiber
LA-PSCF
Used in midspan sections to increase system reach.
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optical fiber
LL-SMF
Enhance Raman gain in final sections of spans.
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