Dostart Nathan, Ehrlichman Yossef, Gentry Cale, Popović Miloš A
Opt Express. 2020 Nov 23;28(24):36055-36069. doi: 10.1364/OE.409381.
We propose and investigate the performance of integrated photonic isolators based on non-reciprocal mode conversion facilitated by unidirectional, traveling acoustic waves. A triply-guided waveguide system on-chip, comprising two optical modes and an electrically-driven acoustic mode, facilitates the non-reciprocal mode conversion and is combined with spatial mode filters to create the isolator. The co-guided and co-traveling arrangement enables isolation with no additional optical loss, without magnetic-optic materials, and with low power consumption. The approach is theoretically evaluated with simulations predicting over 20 dB of isolation and 2.6 dB of insertion loss with a 370 GHz optical bandwidth and 1 cm device length. The isolator uses only 1 mW of electrical drive power, an improvement of 1-3 orders of magnitude over the state of the art. The electronic drive and lack of magneto-optic materials suggest the potential for straightforward integration with drive circuits, including in monolithic CMOS electronic-photonic platforms, enabling a fully contained 'black box' optical isolator with two optical ports and DC electrical power.
我们提出并研究了基于单向行波促进的非互易模式转换的集成光子隔离器的性能。一种片上三波导系统，包括两个光学模式和一个电驱动声学模式，有助于非互易模式转换，并与空间模式滤波器相结合以制造隔离器。共引导和共传播的配置能够实现无额外光学损耗的隔离，无需磁光材料，且功耗低。通过模拟对该方法进行了理论评估，预测在370 GHz光学带宽和1 cm器件长度下，隔离度超过20 dB，插入损耗为2.6 dB。该隔离器仅使用1 mW的电驱动功率，比现有技术提高了1至3个数量级。电子驱动以及缺乏磁光材料表明，它有可能与驱动电路直接集成，包括在单片CMOS电子光子平台中，从而实现一个带有两个光学端口和直流电源的完全集成的“黑匣子”光学隔离器。
