High-Speed 46-GHz 850 nm Photodetector with Inductive Peaking

In this work, high-speed 850 nm GaAs/AlGaAs based dual-depletion-region photodetectors are demonstrated, which aim to meet the increasing need for bandwidth scaling and data rate in short-reach optical links. The devices exhibit the low dark current of ∼134.5 fA and responsivity of ∼0.44 A/W at 850...

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Bibliographic Details
Published in:Journal of lightwave technology 2024-03, Vol.42 (6), p.1-7
Main Authors: Long, Tianyu, Xie, Zhiyang, Li, Linze, Wang, Luyu, Zou, Xinbo, Ji, Haiming, Lu, Juanjuan, Chen, Baile
Format: Article
Language:English
Subjects:
Bandwidth
Bandwidths
Communications systems
Dark current
Data transmission
Depletion
Diameters
dual-depletion-region photodetectors
Electrodes
Frequency measurement
Gallium arsenide
High speed
high-speed 850 nm photodetectors
Impedance
inductive peaking
Optical communication
Photometers
Power transmission lines
Transmission line measurements
Transmission lines
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Summary:In this work, high-speed 850 nm GaAs/AlGaAs based dual-depletion-region photodetectors are demonstrated, which aim to meet the increasing need for bandwidth scaling and data rate in short-reach optical links. The devices exhibit the low dark current of ∼134.5 fA and responsivity of ∼0.44 A/W at 850 nm. The 3-dB bandwidth of 20 μm and 28 μm diameter devices with 50-ohm characteristic impedance transmission line were measured to be 29.72 GHz and 24.71 GHz respectively. While by incorporating inductive peaking via high characteristic impedance transmission line, the 20 μm and 28 μm diameter devices achieved maximum 3-dB bandwidth of 46.06 GHz and 36.09 GHz respectively. To the best of our knowledge, this 20 μm diameter device exhibits the highest 3-dB bandwidth among all the 850 nm photodetectors. This research showcases the potential of 850 nm dual-depletion-region photodetectors as promising solutions for high-speed short-reach optical communication systems, offering improved performance in terms of bandwidth and enabling the advancement of data transmission capabilities.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2023.3328899