A comprehensive model is developed for the calculation of polarization-dependent absorption coefficients and refractive index of the InGaAs-InP interdiffused multiple-quantumwell at room temperature for wavelengths ranging from 1.1 to 2.4 m. Groups III and V types of interdiffusion are considered separately. The as-grown structure is a latticed-matched In0:53Ga0:47As-InP structure with a well width of 60Å. The optical transitions consist of a full quantum-well calculation together with 0; X; and L valleys contributions and through the Kramers-Krönig transformation to link the real and imaginary parts of the dielectric functions. The results show that Group-III-only interdiffusion produces compressive strain and results in a band-edge red shift and refractive index enlargement, while the tensile strain induced by Group-V-only interdiffusion results in a vice verse effect. This provides a left and right tunable band edge and positive and negative index steps dependent on the interdiffusion process. A small and constant birefringence of 0.005 at around 1.55 m can also be obtained over a 50-nm wavelength range by using Group-V-only interdiffusion. These properties have strong implications in realizing a tunable and high-performance device as well as for photonic integrations.
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