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Extraction of nonlinear parameters of dispersive avalanche photodiode using pulsed RF measurement and quasi-DC optical excitation

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4 Author(s)
Ghose, A. ; Dept. of High Frequency Eng., Univ. of Kassel, Germany ; Bunz, B. ; Weide, J. ; Kompa, G.

A measurement system using a pulsed RF signal is presented for extraction of nonlinear parameters of a large-signal model (LSM) of a dispersive avalanche photodiode. Nonlinear model of the avalanche photodiode was considered as two-port network and vector reflection measurement was carried out using a microwave transition analyzer in pulsed RF mode in conjunction with synchronized pulsed optical stimulus on the photodiode. Square-wave optical stimulus of 5-μs width (full width at half maximum) and 5-kHz pulse-repetition frequency (quasi-dc) were synchronized with the pulsed RF excitation using a synchronization circuit. High-frequency dispersion effects were taken into consideration for deriving the current through the photodiode and the theoretical background was given for the derivation of optical and bias-dependent parameters. Nonlinear parameters of LSM of the avalanche photodiode were extracted from the small-signal vector reflection measurement at different bias points and optical conditions. Thermal impedance of the device limits the continuous-wave measurement up to 0.1 mW of optical power, whereas when using the current method, it was possible to characterize the device up to 1.3 mW of peak optical power.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:53 ,  Issue: 6 )