Abstract Breaking the symmetry between forward- and backward-propagating optical modes is of fundamental scientific interest and enables crucial functionalities, such as isolators, circulators, and duplex communication systems. Although there has been progress in achieving optical isolation on-chip, integrated broadband nonreciprocal signal processing functionalities that enable transmitting and receiving via the same low-loss planar waveguide, without altering the frequency or mode of the signal, remain elusive. Here, we demonstrate a nonreciprocal delay scheme based on the unidirectional transfer of optical data pulses to acoustic waves in a chip-based integration platform. We experimentally demonstrate that this scheme is not impacted by simultaneously counterpropagating optical signals. Furthermore, we achieve a bandwidth more than an order of magnitude broader than the intrinsic optoacoustic linewidth, linear operation for a wide range of signal powers, and importantly, show that this scheme is wavelength preserving and avoids complicated multimode structures.

中文翻译：

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片上宽带非互易光存储

摘要 打破前向和后向传播光模式之间的对称性具有基本的科学意义，并且可以实现关键功能，例如隔离器、环行器和双工通信系统。尽管在实现片上光隔离方面取得了进展，但集成宽带非互易信号处理功能能够通过相同的低损耗平面波导进行传输和接收，而不会改变信号的频率或模式，但仍然难以实现。在这里，我们展示了一种基于光数据脉冲单向传输到基于芯片的集成平台中的声波的非互易延迟方案。我们通过实验证明该方案不受同时反向传播的光信号的影响。此外，