摘要
为了解决急剧提升的通信系统容量需求与长距离传输等问题,通过实验验证了超大容量的少模光纤传输。在超大容量需求的背景下,同时使用波分复用、模分复用、偏振复用三种复用技术进行信号传输,凭借自研的低损耗六模渐变型光纤(各模式衰减约为0.2 dB/km),实现了覆盖C波段共80个通道,每个通道双模双偏振信号的1000 km传输。考虑到超长距离传输带来的色散和双模双偏振带来的串扰,在进行接收端离线数字信号处理(DSP)时首先使用频域色散补偿算法进行色散补偿,并在下采样和时钟恢复后联合利用多输入多输出-频域最小均方算法(MIMO-FDLMS)和多输入多输出-时域最小均方算法(MIMO-TDLMS)进行信道均衡和色散补偿。在28%冗余的低密度奇偶校验(LDPC)信道编码软判决前向纠错(SD-FEC)阈值5.2×10^(-2)条件下,实现了总的线传输速率40.96 Tbit/s,净速率高达32 Tbit/s。
Objective In recent years,the explosive growth of data volume has challenged the backbone transmission network whose core technology is optical fiber transmission.In the past,single-mode fiber transmission has long been the first choice for large-capacity and long-distance transmission due to its low loss and high bandwidth.Till now,single-mode fiber still occupies most of the optical transmission networks.However,the rate of single-mode fiber transmission which combines polarization division multiplexing(PDM)and wavelength division multiplexing(WDM)technologies is limited to 100 Tbit/s.It becomes weaker and weaker in the face of the expected increase of several orders of magnitude in the demand for transmission rate.With the emergence of more mature mode division multiplexing(MDM)and demultiplexing technologies,low-dispersion,low-loss few-mode fibers(FMFs),and more advanced digital signal processing(DSP)algorithms,it becomes possible to use few-mode fibers to achieve greater capacity and longer distance transmission.Methods Our few-mode transmission experiment uses a self-developed graded few-mode fiber that can transmit six modes.In the experiment,we choose two modes of LP11a and LP11b for transmission.Compared with other modes,the LP11 mode has a lower loss,and this kind of few-mode transmission can perform power control and dispersion control more easily than the few-mode transmission of different linear polarization modes.The transmission distance of each loop is 50 km,and 1000 km transmission is achieved by transmitting 20 loops.In terms of the experimental setup of the long-distance few-mode fiber loop experiment,at the transmitting end,80 laser sources with a frequency interval of 50 GHz output a total of 80 carriers through the arrayed waveguide grating control.The two IQ signals output by the arbitrary waveform generator modulate the WDM signal of 79 channels and another test signal in the IQ modulator respectively,and then a section of decorrelation signal is generated through the delay line and is use
作者
郑天启
王晨
王凯辉
丁俊杰
朱博文
桑博涵
周雯
沈磊
张磊
王瑞春
闫长鹍
余建军
Zheng Tianqi;Wang Chen;Wang Kaihui;Ding Junjie;Zhu Bowen;Sang Bohan;Zhou Wen;Shen Lei;Zhang Lei;Wang Ruichun;Yan Changkun;Yu Jianjun(Department of Communication Science and Engineering,School of Information Science and Technology,Fudan University,Shanghai 200433,China;Yangtze Optical Fibre and Cable Joint Stock Limited Company,Wuhan 430073,Hubei,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2023年第23期169-176,共8页
Chinese Journal of Lasers
基金
国家重点研发项目(2018YFB1800905)
国家自然科学基金(61935005,61720106015,61835002,62127802)。
关键词
光通信
波分复用
模分复用
偏振复用
长距离传输
超大容量传输
optical communications
wavelength division multiplexing
mode division multiplexing
polarization division multiplexing
long haul transmission
ultra-high-capacity transmission
