Abstract
At low light intensities (linear regime), the absorption coefficient is independent of the light intensity; however, at sufficiently high intensities, the absorption becomes a nonlinear function. In case that incident optical power is sufficiently high to saturate the absorption coefficient, the optical power which is not absorbed is transmitted to the next region in the absorption layer if the photodetector is in longitudinal structure. Therefore this type of light-absorption behavior would be critical in analyzing the nonlinearity of a traveling-wave photodetector (TWPD). The transmitted optical power is absorbed as a nonlinear function of absorption coefficient, and the generated photocurrent due to the saturated absorption also shows the nonlinear characteristics. In this paper, we calculated the photocurrent of a TWPD considering the effect of the absorption saturation caused by high input intensity, and compared with the results using the linear function of absorption coefficient. For a different incident optical power, the nonlinear characteristics of photocurrent are analyzed for two-tone input signals, and thereby the inter-modulation distortions (IMD's) and spurious-free dynamic range (SFDR) are obtained.
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