High-responsivity 100GHz waveguide UTC photodetector

T. Umezawa, K. Akahane, A. Matsumoto, A. Kanno, N. Yamamoto, Tetsuya Kawanishi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)


    We present a double cladding, high-mesa-type waveguide UTC photodetector with an improved the responsivity. In this device structure, an InGaAs thin core layer was sandwiched by p-InP/InGaAsP and n-InP/InGaAsP cladding layers, including a UTC structure, in order to obtain a good optical coupling between the waveguide and the fiber. By comparing the resulting mode field with that obtained with a single cladding layer structure, we confirmed that the vertical mode field was enlarged. Without a spot size converter, the measured responsivity was as high as 0.6 A/W at 1550 nm, which suggests a responsivity three times higher than that of back-illuminated structures, and higher responsivity than that of previous reports. A high frequency performance (f3dB = 100 GHz) was also measured. The device structure, including the layer, doping level conditions, and optical fiber coupling results are discussed, and its performance is characterized in detail.

    Original languageEnglish
    Title of host publicationBroadband Access Communication Technologies XI
    ISBN (Electronic)9781510606975
    Publication statusPublished - 2017
    EventPhotonics West OPTO 2017 Conference on Broadband Access Communication Technologies XI - San Francisco, United States
    Duration: 2017 Jan 312017 Feb 1


    OtherPhotonics West OPTO 2017 Conference on Broadband Access Communication Technologies XI
    CountryUnited States
    CitySan Francisco



    • Double clad
    • Frequency response
    • Responsivity
    • Waveguide-photodetector

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

    Cite this

    Umezawa, T., Akahane, K., Matsumoto, A., Kanno, A., Yamamoto, N., & Kawanishi, T. (2017). High-responsivity 100GHz waveguide UTC photodetector. In Broadband Access Communication Technologies XI (Vol. 10128). [1012807] SPIE. https://doi.org/10.1117/12.2250246