Abstract
In this paper, we have calculated and discussed in detail the nonlinear effect induced by three carrier
effects: free-carrier absorption, bandgap filling, and bandgap shrinkage. The central wavelength of response of
resonant-cavity-enhanced (RCE) photodetectors shifts according to the change of the refractive index, and the
response of a given optical wavelength simultaneously changes. With an increasing As composition of
In<sub>1-x</sub>Ga<sub>x</sub>As<sub>y</sub>P<sub>1-y</sub> and
the spacer thickness, the nonlinear effect increases, but the -
1-dB input saturation optical power and the -1-dB saturation
photocurrent decrease. Bistable-state operation occurs when the input optical power is in the proper bistable
region.
© 2007 IEEE
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