Mid-infrared optical characterization of InGaAsP
Résumé
We present a measurement of the refractive index of In1−xGaxAsyP1−y lattice-matched to InP outside of the range
available in the literature. We have accurately determined the refractive index of In1−xGaxAsyP1−y lattice-matched
to InP as a function of wavelength (λ 1.55, 2.12, and 3 μm) and arsenic molar fraction (y 0.55, 0.7, and
0.72). Data is interpolated with a theoretical model and compared to the literature whenever possible. Agreement
with currently available data is good. Uncertainties are estimated, the largest one being related to the sample
composition. We also measure propagation losses dominated by scattering (0.15–1.2 cm−1) in ridge waveguides,
for the same range of compositions at wavelengths of 1.55 μm and 2.12 μm.