互耦循环结构中的传输非互易性
Transmission Nonreciprocity in a Mutually Coupled Circulating Structure
摘要：
打破洛伦兹互易性被认为是光场非互易传输的先决条件，因此线性光学系统非互易性的可能性大多被忽略。提出了一种三个相互耦合的微腔或光纤环结构来实现光学非互易性。虽然它与来自两个不同输入端口的场的耦合是恒定相等的，但这种系统在其中一个腔中的光增益饱和或不同腔中的循环场的不对称耦合的情况下不连续地传输它们。光纤环构成的结构可以作为一个与时间无关的线性系统进行非互易传输，而不会破坏洛伦兹互易性。同时从两个不同端口输入的光隔离，甚至近似的光隔离器操作都可以用该结构实现。
英文摘要：
Breaking Lorentz reciprocity was believed to be a prerequisite for nonreciprocal transmissions of light fields, so the possibility of nonreciprocity by linear optical systems was mostly ignored. We put forward a structure of three mutually coupled microcavities or optical fiber rings to realize optical nonreciprocity. Although its couplings with the fields from two different input ports are constantly equal, such system transmits them nonreciprocally either under the saturation of an optical gain in one of the cavities or with the asymmetric couplings of the circulating fields in different cavities. The structure made up of optical fiber rings can perform nonreciprocal transmissions as a time-independent linear system without breaking Lorentz reciprocity. Optical isolation for inputs simultaneously from two different ports and even approximate optical isolator operations are implementable with the structure.
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