Takeshi Umeki

Summary

Affiliation: NTT Communication Science Laboratories
Country: Japan

Publications

  1. doi request reprint Multi-span transmission using phase and amplitude regeneration in PPLN-based PSA
    T Umeki
    NTT Photonics Labs, NTT Corporation, 3 1, Morinosato Wakamiya, Atsugi, Kanagawa, 243 0198 Japan
    Opt Express 21:18170-7. 2013
  2. doi request reprint In-line phase sensitive amplifier based on PPLN waveguides
    Takeshi Umeki
    NTT Photonics Labs, NTT Corporation, 3 1 Morinosato Wakamiya, Atsugi, Kanagawa 243 0198, Japan
    Opt Express 21:12077-84. 2013
  3. doi request reprint 3-dB signal-ASE beat noise reduction of coherent multi-carrier signal utilizing phase sensitive amplification
    Takeshi Umeki
    NTT Photonics Labs, NTT Corporation, 3 1 Morinosato Wakamiya, Atsugi, Kanagawa 243 0198, Japan
    Opt Express 20:24727-34. 2012
  4. doi request reprint Phase sensitive degenerate parametric amplification using directly-bonded PPLN ridge waveguides
    Takeshi Umeki
    NTT Photonics Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan
    Opt Express 19:6326-32. 2011
  5. doi request reprint Phase sensitive amplification with noise figure below the 3 dB quantum limit using CW pumped PPLN waveguide
    Masaki Asobe
    NTT Photonics Laboratories, NTT Corporation, 3 1, Morinosato Wakamiya, Atsugi, Kanagawa 243 0198, Japan
    Opt Express 20:13164-72. 2012

Collaborators

  • Masaki Asobe
  • Osamu Tadanaga

Detail Information

Publications5

  1. doi request reprint Multi-span transmission using phase and amplitude regeneration in PPLN-based PSA
    T Umeki
    NTT Photonics Labs, NTT Corporation, 3 1, Morinosato Wakamiya, Atsugi, Kanagawa, 243 0198 Japan
    Opt Express 21:18170-7. 2013
    ..The ultra long-haul transmission of a 28-Gb/s binary phase shift keying (BPSK) signal over 5400 km was achieved with phase and amplitude regeneration...
  2. doi request reprint In-line phase sensitive amplifier based on PPLN waveguides
    Takeshi Umeki
    NTT Photonics Labs, NTT Corporation, 3 1 Morinosato Wakamiya, Atsugi, Kanagawa 243 0198, Japan
    Opt Express 21:12077-84. 2013
    ..The in-line PSA also operated successfully as a repeater amplifier in a 160 km fiber link without a power penalty. Finally, we demonstrate the regeneration of non-linear impairments induced by fiber non-linearity...
  3. doi request reprint 3-dB signal-ASE beat noise reduction of coherent multi-carrier signal utilizing phase sensitive amplification
    Takeshi Umeki
    NTT Photonics Labs, NTT Corporation, 3 1 Morinosato Wakamiya, Atsugi, Kanagawa 243 0198, Japan
    Opt Express 20:24727-34. 2012
    ..We also achieved a 3-dB SNR improvement in the electric domain by reducing the signal-ASE beat noise. The receiver sensitivity for a 10 Gbit/s phase shift keying signal was clearly improved with the PSA...
  4. doi request reprint Phase sensitive degenerate parametric amplification using directly-bonded PPLN ridge waveguides
    Takeshi Umeki
    NTT Photonics Laboratories, NTT Corporation, Atsugi, Kanagawa, Japan
    Opt Express 19:6326-32. 2011
    ..No secondary wavelength conversion process was observed, and a maximum output of 22 dBm was obtained. We also successfully demonstrated the phase sensitive amplification of a modulated signal light...
  5. doi request reprint Phase sensitive amplification with noise figure below the 3 dB quantum limit using CW pumped PPLN waveguide
    Masaki Asobe
    NTT Photonics Laboratories, NTT Corporation, 3 1, Morinosato Wakamiya, Atsugi, Kanagawa 243 0198, Japan
    Opt Express 20:13164-72. 2012
    ..The PSA was used as a preamplifier for detecting a 40 Gbit/s phase shift keying signal. The low noise characteristics were confirmed by the improved sensitivity...