Abstract
We investigated the direct measurement of intensity-dependent refractive index changes in GaInAsP/InP ridge waveguides with ps-order pump pulses below the band gap using an optical loop mirror interferometer. The temporal response of the probe in GaInAsP (λg=1410 nm) waveguides was shown to be instantaneous with respect to 4 ps pump pulses. The intensity-dependent refractive index coefficient was measured to be -2.0±0.6×10-12 cm2/W. In addition, pump-induced absorption changes were studied.
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