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8 July 2022 Impedance characteristics of high speed VCSELs
Zhao Chen, Jinhao He, Zhiming Chen, Jiaqi Xu, Hui Li
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Proceedings Volume 12280, 2021 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications; 122800E (2022) https://doi.org/10.1117/12.2620181
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only
Abstract
Temperature-dependent impedance characteristics are investigated for high speed VCSELs. Through small signal reflection S11 measurements for a large current range at different temperature and fitting during a equivalent circuit modeling we show that our VCSELs have higher parasitic cutoff frequency at higher temperature. Parasitic is not a limitation for both room temperature and higher temperature operation for our small aperture diameter VCSELs. Also, the values of the equivalent-circuit elements are determined for a large range of current at different temperature operation. Oxide-aperture-diameter-depend impedance characteristics are analyzed at 85 °C, and shows that the larger capacitance is main reason for larger aperture VCSELs have lower parasitic cutoff frequency, and it is necessary to decrease the capacitance for large aperture VCSELs, in order to improve the parasitic cutoff frequency.
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Zhao Chen, Jinhao He, Zhiming Chen, Jiaqi Xu, and Hui Li "Impedance characteristics of high speed VCSELs", Proc. SPIE 12280, 2021 International Conference on Optical Instruments and Technology: Advanced Laser Technology and Applications, 122800E (8 July 2022); https://doi.org/10.1117/12.2620181
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Vertical cavity surface emitting lasers
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