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Browsing by Author "Hsu, Tsung-Chi"

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    Design, Modeling, and Fabrication of High-Speed VCSEL with Data Rate up to 50 Gb/s
    (2019-08-14)
    Shen, Chih-Chiang
    ;
    Hsu, Tsung-Chi
    ;
    Yeh, Yen-Wei
    ;
    Kang, Chieh-Yu
    ;
    Lu, Yun-Ting
    We have studied the characteristics of frequency response at 850-nm GaAs high-speed vertical-cavity surface-emitting lasers (VCSELs) with different kinds of oxide aperture sizes and cavity length using the PICS3D simulation program. Using 5-mu m oxide aperture sizes, the frequency response behavior can be improved from 18.4 GHz and 15.5 GHz to 21.2 GHz and 19 GHz in a maximum of 3 dB at 25 degrees C and 85 degrees C, respectively. Numerical simulation results also suggest that the frequency response performances improved from 21.2 GHz and 19 GHz to 30.5 GHz and 24.5 GHz in a maximum of 3 dB at 25 degrees C and 85 degrees C due to the reduction of cavity length from 3 lambda/2 to lambda/2. Consequently, the high-speed VCSEL devices were fabricated on a modified structure and exhibited 50-Gb/s data rate at 85 degrees C.