Nonlinear Propagation In GaAs/GaAlAs Multiple Quantum Well Waveguides

P. Li Kam Wa; J. H. Marsh; P. N. Robson; J. S. Roberts; N. J. Mason

doi:10.1117/12.950756

11 September 1985 Nonlinear Propagation In GaAs/GaAlAs Multiple Quantum Well Waveguides

P. Li Kam Wa, J. H. Marsh, P. N. Robson, J. S. Roberts, N. J. Mason

Proceedings Volume 0578, Integrated Optical Circuit Engineering II; (1985) https://doi.org/10.1117/12.950756
Event: 1985 Cambridge Symposium, 1985, Cambridge, United States

Abstract

We report the experimental observation of partial switching of light between two coupled multiple quantum well waveguides caused by an increase in the optical intensity of the input beam. About lmW of power launched into the waveguide was required to switch the coupler from a crossed-over state to one of equal power division at the output. The measured value of the nonlinear refractive index coefficient (n,) in one of the guiding layers was 10 cm²/W when the intensity attenuation was 13.5cm^-1. The possibility of the refractive index change being caused by thermal effects has been ruled out experimentally. We have also obtained a theoretical description of this nonlinear directional coupler action by solving the coupled mode equations in the presence of a nonlinear refractive index and a standing attenuation constant. Very good agreement between our model and the experimental device has been obtained.

Citation Download Citation

P. Li Kam Wa, J. H. Marsh, P. N. Robson, J. S. Roberts, and N. J. Mason "Nonlinear Propagation In GaAs/GaAlAs Multiple Quantum Well Waveguides", Proc. SPIE 0578, Integrated Optical Circuit Engineering II, (11 September 1985); https://doi.org/10.1117/12.950756

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