In this paper, physically-based simulations are carried out to investigate and design broadband and high-output power uni-traveling carrier (UTC) photodiodes. The physical model is first verified by comparison to experimentally measured results. The graded-bandgap structure, which can induce potential gradient, is considered to be used in the absorption layers. It is shown that the electric field in the absorption layer is increased by the gradient, thus the performance of bandwidth and saturation current is improved by 36.6% and 40% respectively for our considered photodiode. Moreover, a modified graded-bandgap structure is proposed to further increase the electric field, and an additional 9.5% improvement in bandwidth is achieved. The final proposed UTC-PD structures will result in 399-GHz bandwidth and 49-mA DC saturation current.
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机译：在本文中，进行了基于物理的仿真，以研究和设计宽带和高输出功率单程载波（UTC）光电二极管。首先通过与实验测量结果进行比较来验证物理模型。可以引起电势梯度的梯度带隙结构被认为用于吸收层。结果表明，吸收层中的电场随梯度增加，因此对于我们考虑的光电二极管，带宽和饱和电流的性能分别提高了36.6％和40％。此外，提出了一种改进的梯度带隙结构，以进一步增加电场，并实现了带宽另外9.5％的改善。最终提出的UTC-PD结构将产生399 GHz带宽和49 mA DC饱和电流。
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