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Peak-to-average power ratio reduction in all-optical orthogonal frequency division multiplexing system using rotated constellation approach

机译：使用旋转星座方法的全光正交频分复用系统中峰均功率比降低

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摘要

In this paper, a new approach for reducing peak-to-average power ratio (PAPR) based on modulated half subcarriers in all-optical OFDM systems with rotated QAM constellation is presented. To reduce the PAPR, the odd subcarriers are modulated with rotated QAM constellation, while the even subcarriers are modulated with standard QAM constellation. The impact of the rotation angle on the PAPR is mathematically modeled. The effect of PAPR reduction on the system performance is investigated by simulating the all-optical OFDM system, which uses optical coupler-based inverse fast Fourier transform (IFFT)/fast Fourier transform (FFT). The all-optical system is numerically demonstrated with 29 subcarriers. Each subcarrier is modulated by a QAM modulator at a symbol rate of 25 Gsymbol/s. The results reveal that PAPR is reduced with increasing the angle of rotation. The PAPR reduction can reach about 0.8 dB when the complementary cumulative distribution function (CCDF) is 1 x 10(-3). Furthermore, both the nonlinear phase noise and the optical signal-to-noise ratio (OSNR) of the system are improved in comparison with the original all-optical OFDM without PAPR reduction. (C) 2015 Elsevier Inc. All rights reserved.
机译：本文提出了一种在具有旋转QAM星座的全光OFDM系统中基于调制半子载波降低峰均功率比（PAPR）的新方法。为了降低PAPR，奇数子载波用旋转的QAM星座进行调制，而偶数子载波用标准QAM星座进行调制。旋转角度对PAPR的影响是数学建模的。通过模拟全光OFDM系统，研究了PAPR降低对系统性能的影响，该系统使用基于光耦合器的快速傅里叶逆变换（IFFT）/快速傅里叶逆变换（FFT）。用29个子载波对全光系统进行了数值演示。每个子载波由QAM调制器以25 Gsymbol / s的符号速率进行调制。结果表明，PAPR随着旋转角度的增加而降低。当互补累积分布函数（CCDF）为1 x 10（-3）时，PAPR降低可以达到约0.8 dB。此外，与原始的不带PAPR降低的全光OFDM相比，系统的非线性相位噪声和光信噪比（OSNR）都得到了改善。 （C）2015 Elsevier Inc.保留所有权利。

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