Abstract
The authors developed a magneto-optical (Cd,Mn)Te∕(Cd,Zn)Te quantum well waveguide and demonstrated that the Faraday rotation in the waveguide was slightly dependent on the wavelength. For a waveguide with a quantum well width of 20Å, constant Faraday rotation and a small amount of wavelength dispersion were simultaneously achieved in a wide 25nm wavelength range at room temperature. Thus the broadband waveguide optical isolator is operated over a wide bandwidth of 25nm. This result shows that it is feasible to monolithically integrate an optical isolator made of diluted magnetic semiconductor with semiconductor optoelectronic devices.
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