Anisotropic two-photon transitions in GaAs/AlGaAs multiple quantumwell waveguides |
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Authors: | Yang CC Villeneuve A Stegeman GI Cheng-Hui Lin Hao-Hsiung Lin |
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Affiliation: | Dept. of Electr. & Comput. Eng., Pennsylvania State Univ., University Park, PA; |
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Abstract: | The two-photon absorption coefficient and induced nonlinear refractive index in both TE and TM modes of GaAs/AlGaAs multiple-quantum-well (MQW) strip-loaded channel waveguides are measured in the wavelength range from 1490 nm to 1660 nm. The two-photon absorption coefficient ranges from almost zero to 12 cm/GW, and the nonlinear refractive index is always on the order of 10-13 cm 2/W in the wavelength window investigated. Strong nonlinear anisotropy is observed. The values of the two-photon absorption coefficient are obtained by calibrating the inverse transmission measurements. Those of the nonlinear refractive index are obtained by monitoring the signal spectrum broadening due to self-phase modulation. The wavelength dependences of the measured two-photon absorption coefficient and nonlinear refractive index are reasonably consistent with the theoretical predictions |
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