Abstract
The third-order intermodulation distortions of an InGaAs/InP modified uni-traveling carrier photodiode (MUTC-PD) are characterized using a two-tone setup. At 0.3 GHz modulation frequency and photocurrents above 40 mA the third order local intercept point (IP3) reaches 52 dBm and remains above 35 dBm up to the photodiode's 3 dB bandwidth. A simple equivalent circuit model is used to explain the frequency characteristics of the intermodulation distortions. Based on experimental data, we find that the frequency characteristics of the IP3 can be attributed to the change of both the responsivity and device capacitance induced by the photocurrent and the transient voltage drop at the load and series resistors. Further investigations of the non-linear phenomena suggest that the Franz-Keldysh effect and impact ionization are the primary reasons for voltage-dependent responsivity, while low doping concentration in the p-type InGaAs absorber and space charge screening are responsible for the voltage dependent capacitance and photocurrent dependent capacitance, respectively.
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