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GaAs/GaAlAs multiquantum well waveguides for all-optical switching at 1.55 mu m

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10 Author(s)
Tsang, H.K. ; Sch. of Phys., Bath Univ., UK ; Grant, R.S. ; Penty, R.V. ; White, I.H.
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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 n2 of 9*10-14 cm2/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.

Published in:

Electronics Letters  (Volume:27 ,  Issue: 22 )