合成频率光子交换结构的设计与物理约束
Design and Physical Constraints of Synthetic-Frequency Photonic Switching Fabrics
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中文总结 AI 辅助
该研究探讨将合成频率耦合纳入光子交换结构的架构与物理约束，发现其可减少连接阻塞，需联合元件实现空间状态独立编程，并评估了薄膜铌酸锂谐振器模型的性能。
中文摘要 AI 辅助
电光频率转换与合成频率耦合是集成光子器件中已确立的功能。然而，它们在多端口交换结构中的作用取决于同时光连接如何共享空间路径、频率信道和器件控制。本文研究了如何将频率模式间的相干耦合纳入光子交换结构，并确定相应的架构和物理约束。研究表明，当所有信道均可自由访问时，合成频率耦合不会增加同时正交频率信道的数量，但可建立那些原本因固定输入频率、信道连续性要求或不可用输出信道而被阻塞的连接。在测试条件下，针对每端口含8个频率信道的8×8交换结构，耦合前三个频率间隔可实现无限制模式间耦合所获阻塞减少量的96.1%。进一步研究显示，单独的纯频率转换级无法替代缺失的空间连接；而要实现空间交换元件的名义减少，则需要一种联合元件，其空间状态可针对每个频率信道独立编程。最后，本文利用已报道的电光耦合和光子衰减尺度，在多级马赫-曾德尔干涉仪交换结构中评估了一种薄膜铌酸锂谐振器模型。这些结果阐明了合成频率耦合的架构作用，以及将其纳入集成光子交换结构的器件级要求。
英文摘要
Electro-optic frequency conversion and synthetic-frequency coupling are established functions in integrated photonic devices. Their role within a multiport switching fabric, however, depends on how simultaneous optical connections share spatial paths, frequency channels, and device controls. Here, we investigate how coherent coupling among frequency modes can be incorporated into photonic switching fabrics and identify the corresponding architectural and physical constraints. We show that synthetic-frequency coupling does not increase the number of simultaneous orthogonal frequency channels when all channels are freely accessible, but can establish connections that are otherwise blocked by fixed input frequencies, channel-continuity requirements, or unavailable output channels. Under the tested conditions, coupling over the first three frequency spacings in an $8\times8$ fabric with eight frequency channels per port achieves 96.1% of the blocking reduction obtained with unrestricted inter-mode coupling. We further show that a separate frequency-only conversion stage cannot replace missing spatial connectivity. A nominal reduction in spatial switching elements instead requires a joint element whose spatial state can be programmed independently for each frequency channel. Finally, we evaluate a thin-film lithium niobate resonator model using reported electro-optic coupling and photon-decay scales within a multistage Mach-Zehnder interferometer switching fabric. These results clarify the architectural role of synthetic-frequency coupling and the device-level requirements for incorporating it into integrated photonic switching fabrics.
发表机构
- Institute of Materials Science (ICMUV), University of Valencia（瓦伦西亚大学材料科学研究所）
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