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The article discusses the study on kerr optical nonlinearities in optical isolation, and details the new opportunities and limitations in time-invariant optical systems. The researchers have demonstrated that Kerr nonlinear devices can be designed to isolate strong signals, but they do not necessarily provide the same non-reciprocal response in superposition with large signals or noise. They suggest that nano-devices such as diodes and transistors should be given priority in photonics.

The article focuses on on-chip optical isolation by citing reference to various research studies demonstrating non-reciprocal optical response, which is based on a synthetic magnetic field in an all-silicon platform. Topics discussed include research study by L.D. Tzuang and team in which they used synthesized magnetic field to 43 percent isolation for showing non-reciprocal effect, Aharonov?Bohm effect, and use of optical isolation in fields including on-chip lasers and optical routing.