Optical Isolation Using Nonreciprocal Polarization Rotation in Fe-InGaAlAs/InP Semiconductor Active Waveguide Optical Isolators

摘要

We propose semiconductor optical isolators based on nonreciprocal polarization rotation. The optical isolation is based on the magnetic field dependence of the polarization rotation, which is produced by the nonreciprocal phase difference in Fe-lnGaAIAs/lnP semiconductor active waveguide optical isolators. We characterized their alpha parameter and demonstrated an extinction ratio of 18.3dB in 0.85-mm-long waveguide devices. This is a new approach to realize monolithically integrable semiconductor optical isolators with large optical isolation and short (<1 mm) device length.