Yaru Han, Bing Xiong, Changzheng Sun, Zhibiao Hao, Jian Wang, Yanjun Han, Lai Wang, Hongtao Li, Jiadong Yu, Yi Luo, "Distributed parameter circuit model for wideband photodiodes with inductive coplanar waveguide electrodes," Chin. Opt. Lett. 18, 061301 (2020)
- Chinese Optics Letters
- Vol. 18, Issue 6, 061301 (2020)
Fig. 1. (a) Schematic diagram and (b) equivalent circuit model of the CPW. (c) The equivalent circuit model of the PD. Region 1 represents the transit time parameters, Region 2 represents the bulk and parasitic parameters of the PD, and Region 3 represents the
Fig. 2. Two different CPW structures: (a) CPW-1 with
Fig. 3. Fitted
Fig. 4. Top view of the PDs with the (a) CPW-1 and (b) CPW-2 structures, (c) the schematic device structure[16], and (d) the epitaxial layers of the MUTC-PD.
Fig. 5. (a) Measured and fitted frequency response at a reverse bias of 5 V and a photocurrent of 35 mA. (b) The output RF power versus the DC photocurrent at 40 GHz under a reverse bias of 5 V. (c) The 3 dB bandwidth under different biases and a fixed photocurrent of 35 mA. (d) The bandwidth improvement of PD-2 over that of PD-1.
Fig. 6. Measured and fitted
Fig. 7. 3 dB bandwidth limited by the transit time and RC constant of PD-1 and PD-2 under different bias voltages.
Fig. 8. (a) Frequency responses of the PDs under a bias voltage of 5 V. (b) Frequency responses of the PDs with and without the CPW electrodes.
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Table 1. Parameters of 3-Section Model (Region 3)
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Table 2. Intrinsic Parameters of PDs in Region 1 and Region 2
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