研究目的
To propose and model a new all-optical approach for reducing peak-to-average power ratio (PAPR) in all-optical orthogonal frequency division multiplexing (AO-OFDM) systems based on time interleaving odd and even subcarriers.
研究成果
The proposed TIOES technique reduces PAPR by 3 dB, improves SNR by 2.5 dB, lowers required OSNR by 3 dB, and extends transmission distance from 2280 km to 3520 km at BER=10^{-3} for RZ-4QAM AO-OFDM systems compared to 4QAM AO-OFDM without the technique. It mitigates nonlinear phase noise and enhances system performance.
研究不足
The technique is implemented using optical devices, which may require overcoming electronic bottlenecks; it is specifically designed for phase modulation systems like mQAM and may not be efficient for other modulation types.
1：Experimental Design and Method Selection:
The study uses an analytical model to estimate the impact of interleaved time on PAPR reduction and nonlinear phase noise, and numerical simulations are conducted using VPItransmissionMaker? software. The system employs an optical coupler-based inverse fast Fourier transform/fast Fourier transform.
2：Sample Selection and Data Sources:
The system uses 29 subcarriers modulated with RZ-4QAM format at a symbol rate of 30 Gsymbol/s. Data is generated through simulation.
3：List of Experimental Equipment and Materials:
Optical frequency comb generator, wavelength selective switch, optical RZ-mQAM modulators, optical multiplexers, Mach-Zehnder modulators (MZMs), time delayers, erbium-doped fiber amplifiers (EDFAs), dispersion compensating fiber (DCF), and coherent RZ-QAM optical detectors.
4：Experimental Procedures and Operational Workflow:
Subcarriers are generated, split into odd and even groups, modulated with RZ-mQAM, multiplexed with time delays for odd subcarriers, combined, transmitted over a multi-span optical link with EDFAs and DCF, and received with demodulation.
5：Data Analysis Methods:
Analytical models for PAPR and phase noise variances are derived and compared with numerical simulation results using VPItransmissionMaker?.
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