Faraday rotation in an InP waveguide

摘要

Waveguide Faraday rotation was demonstrated in an InP waveguide with magnetic dopants. The modal Verdet coefficient was 10° /mm T at a wavelength of 1.55 μm. It was found that the Verdet coefficient of the Fe:In_(1-x)Ga_xAs_yP_(1-y) (x=0.290, y=0.628) core was 12.5°/mm T at a wavelength of 1.55 μm. The Verdet coefficient dependence on wavelength is in agreement with theory. The loss of the waveguide was 4.34 dB/cm, giving a magneto-optic figure of merit of 23 at a magnetic field of 1 T and a wavelength of 1.55 μm. This semiconductor waveguide shows promise for monolithically integrated optical isolators.