GaAs/GaAlAs multiquantum well waveguides for all-optical switching at 1.55 mu m |
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| Authors: | Tsang HK Grant RS Penty RV White IH Soole JBD Colas E Leblanc HP Andreadakis NC Kim MS Sibbett W |
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| Affiliation: | Sch. of Phys., Bath Univ., UK; |
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| Abstract: | The first measurements of selfphase modulation and nonlinear absorption in a GaAs/GaAlAs multiquantum well (MQW) waveguide near the half-bandgap resonance are reported. An intensity-dependent refractive index coefficient n/sub 2/ of 9*10/sup -14/ cm/sup 2//W and a two-photon absorption coefficient of 0.15 cm/Gw at 1.55 mu m wavelength for TM light were obtained. This corresponds to an intensity-independent figure of merit of 24 rad phase change in one nonlinear absorption length, high enough to allow the implementation of subpicosecond all-optical switches at 1.55 mu m wavelength.<> |
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