Author Affiliations
Abstract
1 School of Information Science and Technology, Fudan University, Shanghai 200433, China
2 Changfei Optical Fiber and Cable Joint Stock Limited Company, Wuhan 430073, China
3 Nanjing University of Information Science & Technology, Nanjing 210000, China
We experimentally transmit eight wavelength-division-multiplexing (WDM) channels, 16 quadratic-amplitude-modulation (QAM) signals at 32-GBaud, over 1000 km few mode fiber (FMF). In this experiment, we use WDM, mode division multiplexing, and polarization multiplexing for signal transmission. Through the multiple-input–multiple-output (MIMO) equalization algorithms, we achieve the total line transmission rate of 4.096 Tbit/s. The results prove that the bit error rates (BERs) for the 16QAM signals after 1000 km FMF transmission are below the soft-decision forward-error-correction (SD-FEC) threshold of 2.4×10-2, and the net rate reaches 3.413 Tbit/s. Our proposed system provides a reference for the future development of high-capacity communication.
optical fiber communication mode division multiplexing few-mode fiber multiple-input–multiple-output high-capacity transmission long-distance transmission 
Chinese Optics Letters
2024, 22(1): 010602
作者单位
摘要
1 复旦大学通信与信息工程学院通信科学与工程系,上海 200433
2 长飞光纤光缆股份有限公司,湖北 武汉 430073
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。
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 
中国激光
2023, 50(23): 2306001
作者单位
摘要
1 复旦大学信息科学与工程学院通信科学与工程系,上海 200433
2 长飞光纤光缆股份有限公司,湖北 武汉 430073
3 南京信息工程大学物理与光电工程学院,江苏 南京 210044
为了解决通信容量不足以及非线性损伤问题,基于正交相位(IQ)调制外差相干探测,利用极化复用技术、模分复用技术以及先进的数字处理算法,搭建了单通道模分复用少模光纤传输系统,并成功实现了波特率为32 Gbaud的16正交振幅调制(QAM)信号在两个兼并模LP11a和LP11b模式下的1000 km传输。使用时域和频域多输入多输出最小均方(MIMO-LMS)算法进行均衡处理后,误码率(BER)低于软判决前向纠错(SD-FEC)的阈值(5.2×10-2)。
光通信 光纤通信 模分复用 少模光纤 极化复用 长距离传输 optical communications optical fiber communications modular division multiplexing few-mode fiber polarization multiplexing long-haul transmission 
中国激光
2023, 50(19): 1906006
作者单位
摘要
1 复旦大学信息科学与工程学院,上海 200433
2 长飞光纤光缆股份有限公司,湖北 武汉 430073
3 南京信息工程大学,江苏 南京 210044
为了满足日益增长的数据需求,实现“超大容量、超长距离”通信,结合波分复用、偏振复用、模式复用3种复用技术,演示了一个少模光纤传输系统。实验生成符合ITU-T标准的80个通道,利用两个正交偏振及LP11a、LP11b两个模式,在最长达1000 km的少模光纤上传输32 GBaud的16QAM信号。为了减少色散效应和严重的偏振间、模间串扰产生的影响,在接收端数字信号处理(DSP)中,采用基于时域和频域的多输入多输出(MIMO)均衡解复用技术,显著提升系统性能。实验结果表明,经500/1000 km的少模光纤传输,系统的比特误码率(BER)分别能满足7%低密度奇偶校验码(LDPC)硬判决门限(3.8×10-3)和25% LDPC软判决门限(4.2×10-2)。当少模光纤传输距离为1000 km时,系统实现的净速率为32.768 Tbit/s,属于国内领先水平。
光通信 少模光纤 波分复用 MIMO均衡 大容量传输 长距离通信 optical communication few-mode fiber wavelength division multiplexing MIMO equalization ultrahigh-capacity transmission ultralong-distance communication 
光学学报
2023, 43(10): 1006004
作者单位
摘要
1 Key Laboratory for Information Science of Electromagnetic Waves (MoE), Fudan University, Shanghai 200433, China
2 Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, China
We experimentally demonstrate an 80-channel wavelength division multiplexing (WDM) transmission system over a 400 km fiber link. Raman amplification results in a non-flat WDM signal spectrum. Therefore, bit allocation optimization is used to enable different channels to carry different order quadrature amplitude modulation signals according to their optical signal-noise-ratios. A neural network equalizer based on a convolutional neural network (CNN), long short-term memory (LSTM) network, and fully connected (FC) layer structure is adopted in Rx digital signal processing, in which CNN is used for characteristic extraction, LSTM is used for equalization and demodulation, and FC layers are used for output. After transmission, the bit error rate of all channels is below the 25% soft-decision forward error correction threshold, and the line rate reaches 53.76 Tbit/s.We experimentally demonstrate an 80-channel wavelength division multiplexing (WDM) transmission system over a 400 km fiber link. Raman amplification results in a non-flat WDM signal spectrum. Therefore, bit allocation optimization is used to enable different channels to carry different order quadrature amplitude modulation signals according to their optical signal-noise-ratios. A neural network equalizer based on a convolutional neural network (CNN), long short-term memory (LSTM) network, and fully connected (FC) layer structure is adopted in Rx digital signal processing, in which CNN is used for characteristic extraction, LSTM is used for equalization and demodulation, and FC layers are used for output. After transmission, the bit error rate of all channels is below the 25% soft-decision forward error correction threshold, and the line rate reaches 53.76 Tbit/s.
wavelength division multiplexing transmission Raman amplification bit allocation optimization neural network equalizer 
激光与光电子学进展
2023, 60(7): 0736002
丁俊杰 1,2,*王演祎 1,2张教 3朱敏 3[ ... ]余建军 1,2
作者单位
摘要
1 复旦大学通信科学与工程系电磁波信息科学教育部重点实验室, 上海 200433
2 复旦大学上海先进通信与数据科学研究院, 上海 200433
3 网络通信与安全紫金山实验室, 江苏 南京 211111
4 西安邮电大学, 陕西 西安 710121
在光子辅助的W波段通信系统中,利用概率整形技术,实验验证了概率整形的八进制脉冲幅度调制(PS-PAM8)信号在太赫兹空芯光纤中的有线传输。采用包络检测的方案,在97~105 GHz的W波段上成功实现了5.75 GBaud的PS-PAM8信号在1 m空芯光纤上的传输。实验中的净传输速率可达13.63 Gbit/s, 满足2.4×10 -2的20%开销的软判决前向纠错码阈值。该实验结果证明了THz空芯光纤作为一种新型的W波段高速传输介质的潜力。
光通信 脉冲幅度调制 概率整形 光载无线 空芯光纤 optical communications pulse amplitude modulation probabilistic shaping radio-over-fiber hollow-core fiber 
光学学报
2021, 41(24): 2406003

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!