A novel weakly guiding multimode fiber (MMF) with enhanced performance, named inverse hyperbolic tangent MMF (IHTAN MMF), is proposed and designed to exhibit larger separation ( ${\geq }1\times 10\,\,^{\mathrm{ -4}}$ ) within 14 mode groups (MGs). This ensures improved available data channels compared with standard graded-index MMF and various recent orbital angular momentum (OAM) fibers, thus enabling a transmission free of multiple-input/multiple-output (MIMO). A numerical study of the key characteristics and performance metrics of the proposed IHTAN MMF is performed. The modal analysis shows a large separation between the supported MGs, thereby enabling low inter-channel crosstalk (XT) and enhanced OAM mode purities (99.9%). Consequently, resistivity to intrinsic XT is enhanced (−30 dB). Low differential intergroup and intragroup delays and flat and low chromatic dispersion are analyzed (proved), discussed, and compared with those of recent fibers. Comparison findings show that IHTAN MMF could play a role in short- or medium-haul MG multiplexing communications free of MIMO digital signal processing (DSP). Finally, the multiplexing, transmission, and demultiplexing system of 50 OAM data channels collocated with small, cost-effective, energy-efficient MIMO DSP blocks are discussed to enhance the scalability of the proposed fiber. The results show that IHTAN MMF could be a promising candidate for next-generation MMF-enabled OAM transmission systems.

中文翻译：

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用于 OAM 模式/模组复用光网络的反双曲正切光纤


提出并设计了一种具有增强性能的新型弱引导多模光纤（MMF），称为反双曲正切多模光纤（IHTAN MMF），其设计具有更大的分离度（ ${\geq }1\times 10\,\,^{\mathrm{ -4}}$ ) 在 14 个模式组 (MG) 内。与标准渐变折射率 MMF 和各种最新的轨道角动量 (OAM) 光纤相比，这确保了改进的可用数据通道，从而实现无多输入/多输出 (MIMO) 的传输。对所提出的 IHTAN MMF 的关键特性和性能指标进行了数值研究。模态分析显示所支持的 MG 之间有很大的分离，从而实现了低通道间串扰 (XT) 和增强的 OAM 模式纯度 (99.9%)。因此，对本征 XT 的抵抗力增强 (-30 dB)。对低差分组间和组内延迟以及平坦和低色散进行了分析（证明）、讨论，并与最新光纤进行了比较。比较结果表明，IHTAN MMF 可以在无需 MIMO 数字信号处理 (DSP) 的短程或中程 MG 复用通信中发挥作用。最后，讨论了 50 个 OAM 数据通道与小型、经济有效、节能的 MIMO DSP 模块搭配的复用、传输和解复用系统，以增强所提出光纤的可扩展性。结果表明，IHTAN MMF 可能成为下一代支持 MMF 的 OAM 传输系统的有希望的候选者。