Silicon Waveguide Optical Isolator Operating for TE Mode Input Light

A waveguide optical isolator with a nonreciprocal phase shift is promising for obtaining high-optical isolation owing to its single-polarization operation. A typical configuration enables operation for only the TM mode input light. A silicon waveguide polarization rotator with asymmetric two parallel waveguides is implemented with the silicon waveguide optical isolator for operation with the TE mode input light. Maximal isolation of 26.7 dB at the wavelength of 1553 nm is demonstrated experimentally.