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Optical phase conjugation with dual frame OFDM for dispersion and nonlinearity mitigation over multimode fiber

机译：双框架OFDM的光学相位缀合用于多模光纤的分散和非线性缓解

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This paper presents a modification in conventional asymmetrically clipped optical OFDM (ACO-OFDM) frame for direct detection intensity modulation (DD-IM) system. The conventional ACO-OFDM for DD-IM utilizes only one-fourth of available subcarriers for information symbols and therefore the bandwidth efficiency is very low. Authors propose to retain the othwerwise discarded negative polarity symbols to increase the bandwidth efficiency and transmission power for given number of subcarriers in ACO-OFDM. Proposed dual frame OFDM consists of two similar subframes and one of them is transmitted with optical phase conjugation for dispersion and non-linearity mitigation in multimode optical fiber. Proposed system is compared with another scheme-phase conjugated sub-carrier coding (PCSC) in OFDM. At - 15 dBm received optical power, proposed dual frame shows bit error rate (BER) 1.974 * 10~(-3) when compared to PCSC that shows BER value of 1.13 * 10~(-1). BER Performance for the proposed dual frame OFDM with QPSK and QAM-16 modulation schemes is also compared in this research work.
机译：本文介绍了用于直接检测强度调制（DD-IM）系统的传统不对称夹射光学OFDM（ACO-OFDM）框架的修改。用于DD-IM的传统ACO-OFDM仅利用可用子载波的四分之一的信息符号，因此带宽效率非常低。作者提出保留othwerwise丢弃负极性的符号来增加带宽效率和传输功率在ACO-OFDM子载波的给定数量。所提出的双帧OFDM由两个类似的子帧组成，其中一个是用光学相位缀合的传输，用于多模光纤中的色散和非线性缓解。将所提出的系统与OFDM中的另一个方案相结合的子载波编码（PCSC）进行比较。在-15 dBm接收的光功率下，建议双帧显示与PCSC相比，显示比特错误率（BER）1.974 * 10〜（-3），显示BER值为1.13 * 10〜（-1）。在本研究工作中还比较了QPSK和QAM-16调制方案的建议双架OFDM的BER性能。

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