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Abstract
All-optical phase modulation of 10 mu m wavelength radiation based on photoinduced intersub-band birefringence in a GaAs/AlGaAs quantum well waveguide is demonstrated. The undoped multiquantum well layer is inserted in an infra-red slab waveguide. Band-to-band optical pumping is used to activate the infra-red intersub-band absorption and dispersion. As a result, TM and TE infra-red guiding modes present different attenuation and phase retardation as a function of the optical pump power. Photoinduced phase retardation between TM and TE modes of 20 degrees has been measured with a pump power as low as 40 mW. Applications to efficient all-optical phase modulation devices are discussed.
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