摘要
为了利用模分复用(MDM)和超奈奎斯特(FTN)传输技术提高无源光网络(PON)的传输容量和频谱效率,同时也为了保证系统具有良好的误码率性能,本文提出了基于矩阵分解预编码和MIMO预均衡器的联合损伤补偿方法,用于消除超奈奎斯特模分复用无源光网络(FTN-MDM-PON)中存在的MDM信道损伤和FTN传输损伤。对于矩阵分解预编码技术,本文采用奇异值分解(SVD)预编码、带功率预分配的奇异值分解(SVD PA)预编码和Cholesky分解(Chol)预编码方式,分别将它们与MIMO预均衡器结合后对比三种联合方案降低FTN-MDM-PON系统误码率的效果。仿真实验结果表明:采用SVD PA预编码、Chol预编码与MIMO预均衡器结合的联合损伤补偿方法时,FTN-MDM-PON系统中的4个线偏振(LP)模式的FTN信号经过5 km少模光纤(FMF)传输后,接收端误码率能够低于7%硬判决-前向纠错(HD-FEC)门限3.8×10^(-3)。其中,Chol预编码与MIMO预均衡器结合的联合补偿方案降低误码率的效果最优,相比于表现较优的SVD PA预编码结合MIMO预均衡器方案,接收光灵敏度提升了1 dB~3 dB。
Objective The explosive development of virtual reality applications,ultra-high-definition videos,and intelligent internet of things(IoT)devices has brought new challenges to existing fiber access network solutions.As the main scheme of optical access networks,widely deployed passive optical networks based on time division multiplexing(TDM),wavelength division multiplexing(WDM),and polarization multiplexing(PDM)are currently limited by the communication capacity of single-mode fibers(SMFs)and the signal orthogonality of the traditional Nyquist transmission mode.To further improve system capacity and spectral efficiency,we proposed a faster-than-Nyquist mode-division multiplexing passive optical network(FTN-MDM-PON)that combines mode-division multiplexing(MDM)and faster-than-Nyquist(FTN)transmission technologies.However,PON based on the MDM channel and FTN transmission mode exhibits mode crosstalk caused by low-mode fiber transmission and intersymbol interference(ISI)caused by FTN transmission.Because the FTN-MDM-PON divides users by mode,the mode crosstalk in the low-mode fiber(FMF)causes the user signals loaded on different modes to interfere with each other.The ISI introduced by the FTN transmission causes adjacent symbols influence each other at the sampling decision time.To mitigate the two types of impairments in FTN-MDM-PONs,we proposed a joint damage compensation method based on matrix decomposition precoding and MIMO pre-equalization and built a simulation system in the VPI Transmission Maker for verification.Methods Because the PON downlink is a point-to-multipoint structure,it is impossible to simultaneously receive and eliminate mode crosstalk for all modes on the receivers of user-side optical network units(ONUs).In addition,the ISI introduced by FTN transmission technology is determined by the rolling-down factor of the pulse-forming filter and the time-domain compression factor,which is determined at the end of the transmitter.Therefore,we propose a joint damage compensation method based on matrixdec
作者
张倩武
詹书成
刘博洋
陈冠文
李智宇
欧阳远江
曹炳尧
李正璇
吴雅婷
Zhang Qianwu;Zhan Shucheng;Liu Boyang;Chen Guanwen;Li Zhiyu;Ouyang Yuanjiang;Cao Bingyao;Li Zhengxuan;Wu Yating(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,School of Communication and Information Engineering,Shanghai University,Shanghai 200444,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2024年第5期76-87,共12页
Chinese Journal of Lasers
基金
国家重点研发计划(2021YFB2900800)
上海市科委自主项目(22511100902,22511100502,20511102400)
上海市自然科学基金(20ZR1420900)
高等学校学科创新引智计划(D20031)。
关键词
光通信
无源光网络
模分复用
多输入多输出
超奈奎斯特
预编码
预均衡
optical communications
passive optical network
mode division multiplexing
multiple-input multiple-output
fasterthan-Nyquist
precoding
pre-equalization
