The progress of on-chip optical communication relies on integrated multi-dimensional mode (de)multiplexers to enhance communication capacity and establish comprehensive networks. However, existing multi-dimensional (de)multiplexers, involving modes and wavelengths, face limitations due to their reliance on single-directional total internal reflection and multi-level mode conversion based on directional coupling principles. These constraints restrict their potential for full-duplex functionality and highly integrated communication. We solve these problems by introducing a photonic-like crystal-connected bidirectional micro-ring resonator array (PBMRA) and apply it to duplex mode-wavelength multiplexing communication. The directional independence of total internal reflection and the cumulative effect of the subwavelength-scale pillar within the single-level photonic crystal enable bidirectional mode and wavelength multiplexed signals to transmit among multi-pair nodes without interference, improving on-chip integration in single-level mode conversion. As a proof of concept, we fabricated a nine-channel bidirectional multi-dimensional (de)multiplexer, featuring three wavelengths and three TE modes, compactly housed within a footprint of 80 μm×80 μm, which efficiently transmits QPSK-OFDM signals at a rate of 216 Gbit/s, achieving a bit error rate lower than 10−4. Leveraging the co-ring transmission characteristic and the orthogonality of the mode-wavelength channel, this (de)multiplexer also enables a doubling of communication capacity using two physical transmission channels.

中文翻译：

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用于双工模式和波长通道（解）复用的光子晶体连接双向微环谐振器阵列


片上光通信的进步依赖于集成的多维模式（解）复用器来增强通信能力并建立综合网络。然而，现有的涉及模式和波长的多维（解）复用器由于依赖于单向全内反射和基于定向耦合原理的多级模式转换而面临局限性。这些限制限制了它们实现全双工功能和高度集成通信的潜力。我们通过引入类光子晶体连接的双向微环谐振器阵列（PBMRA）来解决这些问题，并将其应用于双工模式波长复用通信。全内反射的方向独立性和单层光子晶体内亚波长尺度柱的累积效应使得双向模式和波长复用信号能够在多对节点之间传输而不受干扰，提高了单层的片上集成度模式转换。作为概念证明，我们制造了一个九通道双向多维（解）复用器，具有三种波长和三种 TE 模式，紧凑地安装在 80 英尺的占地面积内。微米×80微米，以216Gbit/s的速率高效传输QPSK-OFDM信号，误码率低于10 −4 。利用共环传输特性和模式波长信道的正交性，该复用器还可以使用两个物理传输信道使通信容量加倍。