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Linearity of Modified Uni-Traveling Carrier Photodiodes

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4 Author(s)
Beling, A. ; Dept. of Electr. & Comput. Eng., Virginia Univ., Charlottesville, VA ; Huapu Pan ; Hao Chen ; Campbell, Joe C.

The third-order intermodulation distortions of an InGaAs/InP charge compensated modified uni-traveling carrier (UTC) photodiode 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 a record-high of 52 dBm and remains above 35 dBm up to the photodiode's 3-dB bandwidth. A simple equivalent circuit model with a voltage-dependent responsivity and a voltage- and photocurrent-dependent junction capacitance is used to explain the frequency characteristics of the intermodulation distortions.

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Lightwave Technology, Journal of  (Volume:26 ,  Issue: 15 )