Microring-Based Unitraveling Carrier Photodiodes for High Bandwidth-Efficiency Product Photodetection in Optical Communication

作者：Hosseinifar Mitra^*; Ahmadi Vahid; Abaeiani Gholamreza

来源：Journal of Lightwave Technology, 2011, 29(9): 1285-1292.

DOI：10.1109/JLT.2011.2125945

• Frequency response
• microring-based unitraveling carrier photodiode (MR-UTC-PD)
• nanoscale
• quantum efficiency
• unitraveling carrier photodiode (UTC-PD)

A novel structure of unitraveling carrier photodiodes (UTC-PDs) with high-speed, high-efficiency, and wavelength selective characteristics is presented. Including the essential features of resonant cavity enhanced photodiodes and waveguide photodiodes, we propose microring-based UTC-PDs (MR-UTC-PDs) which can achieve excellent high-speed and high-quantum efficiency characteristics simultaneously. The photoresponse of MR-UTC-PDs is based on a drift-diffusion model. Photoresponse characteristics of MR-UTC-PDs, which depend on device parameters and coupling conditions, are investigated and it is shown that the overcoupled structures are suitable for high-speed photodetection. The important features of the device, such as efficiency enhancement and wavelength selectivity are discussed and the trade-off between 3 dB bandwidth and efficiency is solved for nanoscaled absorption layer. Additionally, the bandwidth-efficiency product in the order of several hundreds gigahertz can be obtained even with low photoabsorption layers.

• 出版日期2011-5-1