Resonant-cavity separate absorption, charge and multiplication avalanche photodiodes with high-speed and high gain-bandwidth product
- 1 March 1998
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 10 (3) , 409-411
- https://doi.org/10.1109/68.661426
Abstract
Previously, it has been shown that resonant-cavity separate-absorption-and-multiplication (SAM) avalanche photodiodes (APD's) exhibit high-speed and high gain-bandwidth products. In this letter, we describe a resonant-cavity SAM APD with an additional charge layer that provides better control of the electric field profile. These devices have achieved bandwidths as high as 33 GHz in the low-gain regime and a record gain-bandwidth product of 290 GHz. We also describe the correlation between the gain-bandwidth product and the doping level in the charge layer. With width dependent ionization coefficients, the current versus voltage (I-V) and gain-bandwidth simulations agree well with the measured results and indicate that even higher gain-bandwidth should be achievable with an optimized SACM APD structure.Keywords
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