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Wang et al. [1] demonstrated different power transmission coefficients forforward and backward propagation in simulation and experiment. From such ademonstration, the central claim of their paper is that "the spatial inversionsymmetry breaking diode can construct an optical isolator in no conflict withany reciprocal principle". Their claim contradicts the Lorentz reciprocitytheorem, from which it is well known that one cannot construct an isolator thisway.

Comment on "Linear and passive silicon optical isolator" in Scientific Reports 2, 674