Abstract
Photoluminescence and grating coupling techniques have been used to investigate the effect of temperature variations, about room temperature, on the optical waveguiding properties of GaAs/AlGaAs multiple-quantum-well structures. The modal properties are found to exhibit a large temperature dependence near the excitonic resonance and an equally strong dependence on detuning. From the simultaneous measurement of changes in refractive index and absorption over a 20 K temperature range, it is concluded that temperature variations should be kept to within several kelvin in quantum-well devices, if substantial detuning and dielectric shifts are to be avoided.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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