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 廊坊师范学院电子信息工程学院, 河北廊坊 065000
2 北华航天工业学院电子与控制工程学院, 河北廊坊 065000
太赫兹通信兼具微波通信和光波通信的优势, 是解决通信容量紧缺难题的最有效技术手段之一。针对太赫兹波段吸收损耗严重及抗外在扰动差, 难以支持长距传输问题, 设计了一种基于环形光子晶体光纤(PCF)结构的新型太赫兹光纤。以现有常见材料作为光纤基底材质, 通过创新光纤结构中空气孔排布方式, 抵消材料高吸收损耗, 以支持高性能轨道角动量(OAM)模式传输。选择最优参数, 实现 6个 OAM模式群的高模式质量、低限制损耗和宽带宽的稳定传输。在 0.2~0.9 THz宽波段内, 实现模式纯度超过 88.9%, 限制损耗小于 10-7 dB/m。通过软件仿真实验设计, 解决了太赫兹与 OAM技术相结合的关键问题, 为模分复用(MDM)技术在太赫兹通信系统的应用奠定了理论研究基础。
轨道角动量 太赫兹通信 光子晶体光纤 模分复用 Orbital Angular Momentum terahertz communication Photonic Crystal Fiber Mode Division Multiplexing 
太赫兹科学与电子信息学报
2023, 21(12): 1417
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
Author Affiliations
Abstract
1 Shanghai Jiao Tong University, Department of Electronic Engineering, State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai, China
2 Nokia Bell Labs, Murray Hill, New Jersey, United States
3 Shanghai University, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai, China
4 Shanghai Jiao Tong University, School of Electronic Information and Electrical Engineering, John Hopcroft Center for Computer Science, Shanghai, China
Mode-division multiplexing (MDM) technology enables high-bandwidth data transmission using orthogonal waveguide modes to construct parallel data streams. However, few demonstrations have been realized for generating and supporting high-order modes, mainly due to the intrinsic large material group-velocity dispersion (GVD), which make it challenging to selectively couple different-order spatial modes. We show the feasibility of on-chip GVD engineering by introducing a gradient-index metamaterial structure, which enables a robust and fully scalable MDM process. We demonstrate a record-high-order MDM device that supports TE0–TE15 modes simultaneously. 40-GBaud 16-ary quadrature amplitude modulation signals encoded on 16 mode channels contribute to a 2.162 Tbit / s net data rate, which is the highest data rate ever reported for an on-chip single-wavelength transmission. Our method can effectively expand the number of channels provided by MDM technology and promote the emerging research fields with great demand for parallelism, such as high-capacity optical interconnects, high-dimensional quantum communications, and large-scale neural networks.
integrated photonics metamaterial mode-division multiplexing subwavelength grating 
Advanced Photonics
2023, 5(5): 056008
Author Affiliations
Abstract
1 Huazhong University of Science and Technology, Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Wuhan, China
2 Optics Valley Laboratory, Wuhan, China
3 Boston University, Boston, Massachusetts, United States
Diverse spatial mode bases can be exploited in mode-division multiplexing (MDM) to sustain the capacity growth in fiber-optic communications, such as linearly polarized (LP) modes, vector modes, LP orbital angular momentum (LP-OAM) modes, and circularly polarized OAM (CP-OAM) modes. Nevertheless, which kind of mode bases is more appropriate to be utilized in fiber still remains unclear. Here, we aim to find the superior mode basis in MDM fiber-optic communications via a system-level comparison in air-core fiber (ACF). We first investigate the walk-off effect of four spatial mode bases over 1-km ACF, where LP and LP-OAM modes show intrinsic mode walk-off, while it is negligible for vector and CP-OAM modes. We then study the mode coupling effect of degenerate vector and CP-OAM modes over 1-km ACF under fiber perturbations, where degenerate even and odd vector modes suffer severe mode cross talk, while negligible for high-order degenerate CP-OAM modes based on the laws of angular momentum conservation. Moreover, we comprehensively evaluate the system-level performance for data-carrying single-channel and two-channel MDM transmission with different spatial mode bases under various kinds of fiber perturbations (bending, twisting, pressing, winding, and out-of-plane moving). The obtained results indicate that the CP-OAM mode basis shows superiority compared to other mode bases in MDM fiber-optic communications without using multiple-input multiple-output digital signal processing. Our findings may pave the way for robust short-reach MDM optical interconnects for data centers and high-performance computing.
fiber-optic communications mode-division multiplexing spatial modes linearly polarized modes vector modes linearly polarized orbital angular momentum modes circularly polarized orbital angular momentum modes air-core fiber fiber perturbations 
Advanced Photonics
2023, 5(5): 056003
作者单位
摘要
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
采用少模光纤强耦合模分复用技术是大容量光纤通信系统的一种主要方案,而数字信号处理能在数字域补偿信道中带来的损伤,为信号恢复提供了灵活性并进一步提升传输容量。介绍了少模光纤强耦合通信系统中相比单模光纤系统所受到的额外损伤,并介绍了补偿损伤所使用的多输入多输出(MIMO)均衡算法、空时编码(STC)算法、干扰消除算法和最大似然估计算法的工作原理和主要研究进展,同时阐述了当前这些算法在复杂度、传输时延、光传输速率等方面仍存在局限性。结果表明,MIMO均衡算法结合STC有明显优势,在未来大容量长距离少模光纤强耦合通信系统中具有重要的应用意义。
光通信 模分复用 强耦合 少模光纤 多输入多输出均衡器 空时编码 干扰消除 optical communications mode division multiplexing strong mode coupling few-mode fiber multiple input multiple output equalizer space-time code interference cancellation 
激光与光电子学进展
2023, 60(17): 1700001
郭鹏星 1,2周佳豪 1,2侯维刚 1,2,*郭磊 1,2
作者单位
摘要
1 重庆邮电大学通信与信息工程学院,重庆 400065
2 重庆邮电大学智能通信与网络安全研究院,重庆 400065
为有效地提高片上光交换网络的交换容量及规模,提出了一种基于波长和模式混合复用的无阻塞片上光交换网络架构。首先设计了基于微环谐振器的波长和模式混合复用的2×2光开关,并采用Benes拓扑互连成大规模无阻塞的交换网络。此外,通过设计波长和模式选择及复用模块,使所有节点间能够并行传输数据,并支持多播通信。为了验证所提观点,利用Ansys Lumerical 仿真平台模拟了一个支持2种模式和4种波长混合复用的16×16光交换网络。仿真验证了所提交换网络能够实现所有节点间多维复用信号的并行数据交换,且16×16网络的最大插入损耗小于2.1 dB,模间串扰小于-18.4 dB,网络最大和最小插入损耗差值小于0.5 dB,证明该交换网络具有良好的公平性。最后将所提结构与传统的基于单波长单模式以及多波长单模式的光交换网络进行对比,证明了所提结构可以在不增加波长成本的情况下提升交换网络的容量及节点的规模。
集成光学 片上光交换网络 无阻塞 微环谐振器 波长和模式混合复用 多播通信 integrated optics on-chip optical switching network non-blocking microring resonators hybrid wavelength and mode division multiplexing multicast communication 
光学学报
2023, 43(13): 1313001
作者单位
摘要
电子科技大学光纤传感与通信教育部重点实验室,四川 成都 611731
模分复用(MDM)与高速光传送网(OTN)相结合,能缓解日益增长的带宽需求压力和降低已有相干通信设备的使用成本。搭建了100 Gbit/s双偏振正交相移键控(DP-QPSK)MDM信号放大传输系统,主要包括MDM信号收发单元和少模掺铒光纤放大器(FM-EDFA),其中FM-EDFA采用少模隔离型波分复用器(FM-IWDM)构建。三模(LP01、LP11a和LP11b)放大传输实验表明,相对于无FM-EDFA的MDM系统,各信道的接收机灵敏度(以10-2误码率为参考)分别劣化0.55 dB、1.47 dB和0.99 dB。研究了两模(LP01和LP11b)放大情形下模式增益差(DMG)对信道灵敏度均衡性的影响,结果显示两者无明显的依赖关系。所得结论可为双偏振(DP)信号的MDM放大传输研究提供参考。
光通信 模分复用 少模掺铒光纤放大器 双偏振信号 optical communications mode division multiplexing few-mode erbium-doped fiber amplifier dual-polarization signals 
光学学报
2023, 43(9): 0906004
作者单位
摘要
华中科技大学武汉光电国家研究中心,湖北 武汉 430074
空分复用技术是大幅提高单根光纤数据传输容量的重要技术之一。对于长距离模分复用传输系统而言,少模掺铒光纤放大器是补偿光纤传输损耗必不可少的器件。因此,在少模掺铒光纤支持的所有模式中获得均衡增益至关重要,高差分模态增益会降低系统的传输性能。本文通过改进的化学气相沉积技术制备了18 μm/124 μm少模掺铒光纤,实验演示了基于该光纤的两模掺铒光纤放大器。当使用LP11b模式泵浦时,该放大器所支持的LP01和LP11a模式可以在1535~1560 nm波段获得19.4 dB以上的增益,差分模态增益最大为0.66 dB。
光纤光学 模分复用 少模掺铒光纤 少模掺铒光纤放大器 差分模态增益 fiber optics mode division multiplexing few-mode erbium-doped fiber few-mode erbium-doped fiber amplifier differential modal gain 
激光与光电子学进展
2023, 60(9): 0906006
作者单位
摘要
1 南京邮电大学 电子与光学工程学院,南京 210023
2 南京邮电大学 贝尔英才学院,南京 210023
提出了一种三信道石墨烯电光调制和模分复用集成器件,该器件由单层石墨烯覆盖的一维光子晶体纳米梁腔电光调制模块和纳米线波导模分复用模块组成。利用三维时域有限差分法进行仿真分析,结果表明,该器件可以同时实现TE0模、TE1模和TE2模的调制和模分复用功能。当波长为1 570 nm时,消光比大于28.3 dB,插入损耗小于0.21 dB,信道串扰小于-28.6 dB,调制器的3 dB带宽达到100 GHz,器件尺寸约为100 μm×13 μm。该集成器件性能优良,在大容量光通信系统中具有重要的应用价值。
石墨烯 纳米线波导 电光调制 模分复用 硅基光电子集成 Graphene Nanowire waveguides Electro-optic modulation Mode division multiplexing Silicon-based optoelectronics integration 
光子学报
2023, 52(2): 0213001

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