Optical Isolators are important components of photonic circuits and require breaking of time inversion symmetry. Usually it is achieved with magnetic field but recent years have seen an effort directed toward development of magnetic –field –free optical isolators, based on temporal modulation and/or optical nonlinearity. In this talk various non-magnetic schemes will be compared and the case will be made for the optical isolator based on second and third order nonlinearities that have high degree of isolation and dynamic range

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Jacob B. Khurgin, "Optical-nonlinearity-enabled nonreciprocal propagation: what works and what does not (Conference Presentation)," Proc. SPIE 10548, Steep Dispersion Engineering and Opto-Atomic Precision Metrology XI, 1054811 (Presented at SPIE OPTO: January 31, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2292685.5751550949001.