Abstract
Directional couplers that use multiple-quantum-well (MQW) waveguides1,2 are very attractive for future photonic-exchange systems because a low switching voltage and compactness are simultaneously attainable. Although the refractive-index change induced by the electric field in the MQW is strongly polarization sensitive, it has been recently shown that the polarization-independent refractive-index change can be obtained by introducing the appropriate tensile strain.3 In this paper we present what we believe to be the first polarization-independent switching operation in an MQW directional coupler using tensile strain.
© 1995 Optical Society of America
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