Chip‐Based Optical Isolator and Nonreciprocal Parity‐Time Symmetry Induced by Stimulated Brillouin Scattering,Laser & Photonics Reviews

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Chip‐Based Optical Isolator and Nonreciprocal Parity‐Time Symmetry Induced by Stimulated Brillouin Scattering
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-04-03 , DOI: 10.1002/lpor.201900278
Jiyang Ma ₁ , Jianming Wen ₂ , Shulin Ding ₁ , Shengjun Li ₁ , Yong Hu ₁ , Xiaoshun Jiang ₁ , Liang Jiang ₃ , Min Xiao _{1,

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Affiliation

Realization of chip‐scale nonreciprocal optics such as isolators and circulators is highly demanding for all‐optical signal routing and protection with standard photonics foundry process. Owing to the significant challenge for incorporating magneto‐optical materials on chip, the exploration of magnetic‐free alternatives has become exceedingly imperative in integrated photonics. Here, a chip‐based, tunable all‐optical isolator at the telecommunication band is demonstrated, which is based upon bulk stimulated Brillouin scattering (SBS) in a high‐Q silica microtoroid resonator. This device exhibits remarkable characteristics over most state‐of‐the‐art implements, including high isolation ratio, no insertion loss, and large working power range. Thanks to the guided acoustic wave and accompanying momentum‐conservation condition, bulk SBS also assist in realizing the nonreciprocal parity‐time symmetry in two directly coupled microresonators. The breach of time‐reversal symmetry further makes the design a versatile arena for developing many formidable ultra‐compact devices such as unidirectional single‐mode Brillouin lasers and supersensitive photonic sensors.

中文翻译：

受激布里渊散射引起的基于芯片的光隔离器和不可逆奇偶时间对称

芯片级不可逆光学器件（例如隔离器和循环器）的实现对全光信号路由和标准光子铸造工艺的保护提出了很高的要求。由于将磁光材料集成到芯片上的严峻挑战，在集成光子学中探索无磁替代品已成为当务之急。在此，我们演示了在电信频段基于芯片的可调谐全光隔离器，该隔离器基于高Q二氧化硅微环形谐振器中的体受激布里渊散射（SBS）。该器件在大多数最先进的工具上均具有非凡的特性，包括高隔离率，无插入损耗和较大的工作功率范围。多亏了引导的声波和伴随的动量守恒条件，批量SBS还有助于在两个直接耦合的微谐振器中实现不可逆的奇偶时间对称。突破了时间反转对称性，使该设计成为开发许多强大的超紧凑型设备（如单向单模布里渊激光器和超灵敏光子传感器）的多功能场所。

更新日期：2020-04-03

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