在实地部署的多芯OAM光纤上实现高频谱效率、超低MIMO SDM传输
High Spectral-Efficiency, Ultra-low MIMO SDM Transmission over a Field-Deployed Multi-Core OAM Fiber
AI总结：
本文在5公里实地部署的七环芯光纤上演示了双向SDM传输，实现2×201.6 bit/s/Hz的频谱效率，创下实地部署光缆SDM传输的最高纪录，较已有系统提升约10倍，且仅需低复杂度的小规模4×4 MIMO处理。
摘要：
基于少模多芯光纤（FM-MCF）的空分复用（SDM）系统通过同时利用空间（光纤纤芯）和模式（每个纤芯中的光模式）两个维度，具有最大化每根光纤复用空间信道数量的潜力。然而，迄今为止，尚未有在真实室外环境中实地部署的FM-MCF上进行SDM传输的报道，这与在实际光缆管道中安装的单模多芯光纤（SM-MCF）所演示的SDM方案形成鲜明对比。在本文中，我们展示了在5公里实地部署的七环芯光纤（7-RCF）上进行双向SDM传输的成功演示，该光纤包层直径为178微米，实现了2×201.6 bit/s/Hz的频谱效率（SE）。这项工作在使用实地部署光缆的SDM演示中创造了最高频谱效率的新纪录，与已报道的实地部署光缆传输系统的频谱效率相比实现了约10倍的提升。值得注意的是，这些结果是通过利用小规模模块化4×4多输入多输出（MIMO）处理实现的，其时域均衡（TDE）抽头数不超过15，单位容量的复杂度与采用弱耦合SM-MCF光缆的SDM演示中的MIMO均衡相当。这些结果凸显了在实际应用中利用SDM技术提高频谱效率和扩展单根光纤容量的巨大潜力。
英文摘要：
Few-mode multi-core fiber (FM-MCF) based Space-Division Multiplexing (SDM) systems possess the potential to maximize the number of multiplexed spatial channels per fiber by harnessing both the space (fiber cores) and mode (optical mode per core) dimensions. However, to date, no SDM transmissions over field-deployed FM-MCFs in realistic outdoor settings have been reported, which contrasts with SDM schemes demonstrated using single-mode multi-core fibers (SM-MCFs) installed in practical fiber cable ducts. In this paper, we present the successful demonstration of bidirectional SDM transmission over a 5-km field-deployed seven ring-core fiber (7-RCF) with a cladding diameter of 178 $μ$m, achieving a Spectral Efficiency (SE) of 2$\times$201.6 bit/s/Hz. This work establishes a new record for the highest SE attained in SDM demonstrations utilizing field-deployed fiber cables, achieving an approximate 10x increase compared to the SE of reported field-deployed optical fiber cable transmission systems. Notably, these results are realized through the utilization of small-scale modular 4$\times$4 multiple-input multiple-output (MIMO) processing with a time-domain equalization (TDE) tap number not exceeding 15, maintaining a complexity per unit capacity comparable to that of MIMO equalization in SDM demonstrations employing weakly coupled SM-MCF cables. These results underscore the significant potential for achieving heightened SE and expanding capacity per individual fiber using SDM techniques in practical applications.
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