研究目的
To cope with the various nonlinear signal distortions in IM/DD transmission systems by providing a theoretical analysis on the Volterra nonlinear equalizer (VNLE) focusing on computational complexity aspects and developing a reduced-complexity scheme.
研究成果
The R2-VNLE scheme provides a significant reduction in computational complexity (up to 70%) while maintaining performance close to the full 2nd-order VNLE. Experimental results show superior BER performance compared to other techniques, enabling extended-reach IM/DD links up to 80 km with FEC thresholds met.
研究不足
The computational complexity of VNLEs can be high, potentially prohibiting real-time implementation in IM/DD systems. The study focuses on 2nd-order VNLE and may not address higher-order nonlinearities or other complex distortions fully.
1：Experimental Design and Method Selection:
The study involves a mathematical framework for the VNLE, focusing on computational complexity, and proposes a reduced-complexity scheme (R2-VNLE). Experimental verification uses 28-GBaud SSB-PAM-4 signals over SSMF links up to 80 km, with comparisons to other equalization schemes.
2：Sample Selection and Data Sources:
Signals are generated using an EA-DFB laser and transmitted over standard single-mode fiber. Data is collected using a digital sampling oscilloscope and processed offline in MATLAB.
3：List of Experimental Equipment and Materials:
Includes an arbitrary waveform generator (Keysight M8196A), EA-DFB laser, SSMF, EDFA, OBPF, VOA, PIN photodiode, RF amplifier, and DSO.
4：Experimental Procedures and Operational Workflow:
PAM-4 symbols are generated, modulated onto the laser, transmitted over fiber, amplified, filtered, detected, sampled, and processed with DSP for equalization and BER estimation.
5：Data Analysis Methods:
BER is estimated using Monte-Carlo error-counting over >5×10^7 bits, with LMS algorithm for equalizer adaptation and MATLAB for offline processing.
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Arbitrary Waveform Generator
M8196A
Keysight
Generates 28-GBaud PAM-4 symbols for modulation.
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Electro-Absorption Modulated Distributed-Feedback Laser
EA-DFB
Generates optical signals for transmission.
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Standard Single-Mode Fiber
SSMF
Transmission medium for optical signals.
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Erbium-Doped Fiber Amplifier
EDFA
Amplifies optical signals after transmission.
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Optical Band-Pass Filter
OBPF
Filters optical signals to form SSB and eliminate ASE noise.
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Variable Optical Attenuator
VOA
Controls received optical power before detection.
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PIN Photodiode
Detects optical signals and converts to electrical signals.
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RF Amplifier
Amplifies electrical signals after detection.
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Digital Sampling Oscilloscope
DSO
Samples and stores electrical signals for offline processing.
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