Efficient- and Broadband-Coupled Selective Spot-Size Converters With Damage-Free Graphene Integration Process

Rai Kou, Yuzuki Kobayashi, Kaori Warabi, Hidetaka Nishi, Tai Tsuchizawa, Tsuyoshi Yamamoto, Hirochika Nakajima, Koji Yamada

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    We report an enhancement of coupling efficiency between an optical fiber and graphene photonic device integrated on a silicon photonics platform. The design and optimization of selective spot-size converters (SSSCs) enables low coupling losses of 1.4 dB/facet for TE and 2.4 dB/facet for TM modes without causing damage to the graphene. In order to maximize the potential of the perfect wavelength independent response in the graphene, ultra-broad-bandwidth coupling from O- to U-bands (1300-1650 nm) is characterized. The bandwidth is over 300 nm (at 3-dB roll off) in both polarization modes. We integrated the SSSCs with a partially graphene integrated silicon-ring resonator to substantiate the wavelength response improvement by a pico-meter-order high-resolution spectroscopy.

    Original languageEnglish
    Article number6600409
    JournalIEEE Photonics Journal
    Volume6
    Issue number3
    DOIs
    Publication statusPublished - 2014 Jun 1

      Fingerprint

    Keywords

    • fiber coupling
    • graphene integration
    • Photonic device integration

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Atomic and Molecular Physics, and Optics

    Cite this

    Kou, R., Kobayashi, Y., Warabi, K., Nishi, H., Tsuchizawa, T., Yamamoto, T., Nakajima, H., & Yamada, K. (2014). Efficient- and Broadband-Coupled Selective Spot-Size Converters With Damage-Free Graphene Integration Process. IEEE Photonics Journal, 6(3), [6600409]. https://doi.org/10.1109/JPHOT.2014.2323297