Ultrathin (5.MU.m) Flexible Reflective Waveplate of Fluorinated Polyimide and Elimination of Polarization Sensitivity in Titanium-Diffused Lithium Niobate Waveguide Circuits.

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  • Sawada Takashi
    NTT Science and Core Laboratory Group, 3–9–11, Midori–cho, Musashino, Tokyo 180–8585, Japan
  • Ando Shinji
    NTT Science and Core Laboratory Group, 3–9–11, Midori–cho, Musashino, Tokyo 180–8585, Japan
  • Miyazawa Hiroshi
    NTT Opt–electronics Laboratories, 3–1, Morinosato Wakamiya, Atsugi, Kanagawa 243–0198, Japan
  • Takenaka Hisataka
    NTT Science and Core Laboratory Group, 3–9–11, Midori–cho, Musashino, Tokyo 180–8585, Japan
  • Sasaki Shigekuni
    NTT Science and Core Laboratory Group, 3–9–11, Midori–cho, Musashino, Tokyo 180–8585, Japan

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  • Ultrathin (5 µm) Flexible Reflective Waveplate of Fluorinated Polyimide and Elimination of Polarization Sensitivity in Titanium-Diffused Lithium Niobate Waveguide Circuits

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An ultrathin, flexible reflective half-waveplate, consisting of a 5-µm-thick polyimide quarter-waveplate sputtered with a thin gold film, was fabricated, and its property of eliminating polarization sensitivity in titanium-diffused lithium niobate waveguide circuits was investigated. Transverse electric/transverse magnetic mode-conversion ratios of 15-20 dB at 1.55 µm were obtained, and a polarization-insensitive intensity modulator with a low half-wave voltage of 4.5 V was successfully fabricated using a titanium-diffused lithium niobate waveguide. The excess loss of the polyimide reflective waveplate (1 dB) was much smaller than that using a conventional quartz waveplate (6 dB).

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