Abstract

Measurements have been made at wavelengths between 1486 and 1600 nm of nonlinear refraction and absorption in an InGaAs single quantum well centered in an InGaAsP waveguide. Band-edge resonant nonlinear refractive cross sections as large as σn = −5.0 × 10−20 cm3 have been deduced with a characteristic saturation carrier density of ~2 × 1013 cm−3. For all pulse lengths used (≤ 15 ms) the electronic transition nonlinearity appeared always to dominate any thermally induced refractive-index changes.

© 1993 Optical Society of America

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