研究目的
To investigate the presence of ICI due to the impact of Laser Phase Noise (LPN) and Fiber Non-Linearity (FNL) in CO-OFDM systems and propose a clipping scheme to reduce PAPR and mitigate ICI.
研究成果
The proposed clipping algorithm effectively reduces PAPR and mitigates ICI in CO-OFDM systems, leading to improved receiver sensitivity, quality factor, and BER performance. A clipping ratio of 0.6 is identified as optimal, providing significant enhancements over conventional systems, especially at distances up to 385 km. The method shows robustness against LPN and FNL, making it suitable for long-haul optical communications.
研究不足
The study is based on simulations, which may not fully capture real-world conditions. The clipping method introduces in-band and out-of-band distortions, potentially degrading BER at longer distances. The system is evaluated for specific parameters (e.g., 4QAM, 10 Gbps) and may not generalize to other modulation schemes or higher data rates. Optimization of CR is empirical and might require further tuning for different scenarios.
1：Experimental Design and Method Selection:
The study uses a simulation-based approach to model a CO-OFDM system. A clipping algorithm is proposed to reduce PAPR, which in turn mitigates ICI caused by LPN and FNL. The method involves clipping the OFDM signal based on a threshold amplitude defined by the clipping ratio (CR).
2：Sample Selection and Data Sources:
The simulation uses a 4QAM system with parameters such as bit rate of 10 Gbps, sample rate of 40 Gbps, sequence length of 8192, and 128 subcarriers. Data is generated and processed in MATLAB and VPI Transmission Maker.
3：List of Experimental Equipment and Materials:
Software tools include MATLAB (2014a) for OFDM signal processing and VPI Transmission Maker Ver. 9.5 for optical transmission simulation. Components modeled include a continuous wave laser, IQ modulator, single-mode fiber (SMF), dispersion compensating fiber (DCF), optical amplifier (EDFA), and balanced detectors.
4：5 for optical transmission simulation. Components modeled include a continuous wave laser, IQ modulator, single-mode fiber (SMF), dispersion compensating fiber (DCF), optical amplifier (EDFA), and balanced detectors. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The OFDM signal is generated, modulated using IFFT, clipped based on CR values (e.g., 0.6), transmitted over optical fiber (up to 550 km with SMF and DCF loops), and received. Performance metrics like BER, EVM, and quality factor are measured for different CR values and distances.
5：6), transmitted over optical fiber (up to 550 km with SMF and DCF loops), and received. Performance metrics like BER, EVM, and quality factor are measured for different CR values and distances. Data Analysis Methods:
5. Data Analysis Methods: Data is analyzed using statistical methods to compute PAPR, CCDF, BER, EVM, and quality factor. Comparisons are made between systems with and without clipping to evaluate ICI reduction and performance improvement.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
VPI Transmission Maker
Ver. 9.5
VPIphotonics
Used to implement optical transmitter and receiver components for simulation of optical transmission.
-
MATLAB
2014a
MathWorks
Used to implement the entire OFDM sender and receptor for signal processing and simulation.
-
Single Mode Fiber
Used as the optical transmission medium for the CO-OFDM system.
-
Dispersion Compensating Fiber
Used to compensate for dispersion in the optical transmission system.
-
Optical Amplifier EDFA
Used to amplify the optical signal during transmission.
-
Continuous Wave Laser
Produces the optical carrier for modulation in the IQ modulator.
-
IQ Modulator
Modulates the electrical OFDM signal into optical signal using in-phase and quadrature components.
-
Balanced Detectors
Used in the optical receiver to obtain I/Q components of the OFDM signal after optical-to-electrical conversion.
-
Swept Attenuator
Used to vary the received power in simulations to measure BER vs. received power.
-
登录查看剩余7件设备及参数对照表
查看全部
