IM/DD O-SEFDM系统生成方法及检测器研究  

Generation Method and Detector in IM/DD O-SEFDM System

作　　者：杨静宇 李梦岩 吉妍 王旭 谭勇 杨柳 罗风光[1] Yang Jingyu;Li Mengyan;Ji Yan;Wang Xu;Tan Yong;Yang Liu;Luo Fengguang(School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;Faculty of Physics and Electronic Science,Hubei University,Wuhan 430062,Hubei,China)

机构地区：[1]华中科技大学光学与电子信息学院,湖北武汉430074 [2]湖北大学物理与电子科学学院,湖北武汉430062

出　　处：《光学学报》2022年第19期32-38,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61471179,62001181);湖北大学校基金(202110503000006)。

摘　　要：通过对光高频谱效率频分复用(O-SEFDM)系统的现有多种生成方式的分析,提出了一种基于修正的普适分数阶傅里叶逆变换(uIFrFT)生成方法。基于参数P对称的uIFrFT,可以应用厄米特对称生成实值信号,因此避免了强度调制/直接探测(IM/DD)O-SEFDM中的上变频,实现了系统的简化。在该方案中设计了适配的球面部分检测器(SPD)。仿真结果表明,对于IM/DD O-SEFDM系统,uIFrFT生成方法在灵活性和性能上优于现有生成方法。此外,在4阶正交振幅调制(4QAM)和16QAM传输系统中,SPD相比于传统固定球面检测器(FSD)的误码率(BER)性能得到提升,而且复杂度降低了约51%。Upon the analysis of the existing generation methods for the optical spectrally efficient frequency-division multiplexing(O-SEFDM) system, a generation method based on the modified universal inverse fractional Fourier transform(uIFrFT) is proposed. On the basis of uIFrFT with P symmetry, Hermitian symmetry can be applied to generate real-valued signals. Therefore, the up-conversion in the intensity modulation/direct detection(IM/DD) OSEFDM system is avoided, which simplifies the system. Meanwhile, a suitable spherical part detector(SPD) is designed in this scheme. The simulations demonstrate that the generation method based on uIFrFT outperforms the existing generation methods in flexibility and performance for the IM/DD O-SEFDM system. Furthermore, SPD has improved the bit error rate(BER) performance and reduced complexity by about 51% compared to the conventional fixed spherical detector(FSD) in fourth-order quadrature amplitude modulation(4QAM) and 16QAM transmission systems.

关 键 词：光通信 高频谱效率频分复用 生成方法 厄米特对称 强度调制/直接探测 

分 类 号：TN913.7[电子电信—通信与信息系统]