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A Wavelength Selective Bidirectional Isolator

A wavelength selective optical isolator is proposed. Being different from conventional isolators, a well-designed wave plate is employed and works together with the Faraday rotator. Different wavelengths thus experiences different phase retardation so that wavelength-dependant polarization states are obtained for bidirectional beams. A (1.49&#956;m, 1.31&#956;m) wavelength selective isolator is demonstrated, which means 1.49&#956;m light only may propagate along one-direction why the opposite wave is only for 1.31&#956;m light. Over 60 dB optical isolation is obtained, which has promising applications in access optical networks.