研究目的
To analyze the physical reasons of the phase noise in Modified Uni-traveling Carrier Photodetector (MUTC-PD) and achieve a reduction, as well as to find a low-phase noise operating condition of the photodetector.
研究成果
The power-dependent transit time is the main factor resulting in the phase change fluctuation with the optical power. The minimum capacitance and the lowest phase change appear in the same incident optical power, guiding to obtain a low-phase noise operating condition of the MUTC-PD.
研究不足
The study focuses on the phase change and AM-to-PM coefficient under specific conditions (60-GHz sinusoidal with 100% modulation depth) and may not cover all operational scenarios of MUTC-PDs.
1：Experimental Design and Method Selection:
The phase change of the 60-GHz sinusoidal with 100% modulation depth is calculated using an equivalent circuit of the MUTC-PD to deduce a calculation formula of the phase change.
2：Sample Selection and Data Sources:
A high-speed MUTC-PD with an active area of 14 μm2 is simulated using Silvaco TCAD software.
3：List of Experimental Equipment and Materials:
Silvaco TCAD software for simulation.
4：Experimental Procedures and Operational Workflow:
The 3dB bandwidth with different optical intensity under different reverse bias voltage is studied. The phase change of the 60 GHz signal with 100% modulation depth at different reverse bias voltage is examined.
5：Data Analysis Methods:
The phase of frequency response equals to the phase change between the input voltage signal and the output current of the MUTC-PD.
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