Masataka Nakazawa

Publications (4)10.76 Total impact

• Article: Highly dispersion-tolerant 160 Gbaud optical Nyquist pulse TDM transmission over 525 km.

  Toshihiko Hirooka, Peng Ruan, Pengyu Guan, Masataka Nakazawa
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  ABSTRACT: We demonstrate an optical Nyquist pulse TDM (Nyquist OTDM) transmission at 160 Gbaud with a substantial increase in the dispersion tolerance compared with a conventional OTDM transmission. Optical Nyquist pulses can be bit-interleaved to ultrahigh symbol rate without suffering from intersymbol interference due to its zero-crossing property at every symbol interval. This allows the signal bandwidth to be greatly narrowed compared to typical pulse waveforms such as Gaussian or sech profile. By virtue of this property, a dispersion tolerance over ± 8 ps/nm was successfully realized in 160 Gbaud, 525 km transmission.
  Optics Express 07/2012; 20(14):15001-7. · 3.59 Impact Factor
• Article: Ultrahigh-speed "orthogonal" TDM transmission with an optical Nyquist pulse train.

  Masataka Nakazawa, Toshihiko Hirooka, Peng Ruan, Pengyu Guan
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  ABSTRACT: We propose a novel "orthogonal" TDM transmission scheme using an optical Nyquist pulse that enables us to achieve an ultrahigh data rate and spectral efficiency simultaneously without any intersymbol interference (ISI). We analytically describe the principle of orthogonal TDM, and demonstrate a 160 Gbaud optical orthogonal TDM transmission using 40 GHz optical Nyquist pulses. Tolerance to GVD and the dispersion slope is significantly improved by virtue of the orthogonality, reduced bandwidth, and minimum ISI.
  Optics Express 01/2012; 20(2):1129-40. · 3.59 Impact Factor
• Article: 2.56 Tbit/s/ch polarization-multiplexed DQPSK transmission over 300 km using time-domain optical Fourier transformation.

  Pengyu Guan, Toshiyuki Hirano, Koudai Harako, Yutaro Tomiyama, Toshihiko Hirooka, Masataka Nakazawa
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  ABSTRACT: We demonstrate a 2.56 Tbit/s/ch polarization-multiplexed single-carrier transmission over 300 km using subpicosecond DQPSK signals. We adopted an ultrafast time-domain optical Fourier transformation technique to reduce waveform distortions. For such an ultrashort optical pulse, depolarization components resulting from second-order polarization-mode dispersion (PMD) become a dominant factor as regards signal distortion because of the broad signal bandwidth. The influence of inter-polarization crosstalk induced by second-order PMD, is presented in detail.
  Optics Express 12/2011; 19(26):B567-73. · 3.59 Impact Factor
• Article: Single-Channel 1.28 Tbit/s-525 km DQPSK Transmission Using Ultrafast Time-Domain Optical Fourier Transformation and Nonlinear Optical Loop Mirror.

  Pengyu Guan, Hans Christian Hansen Mulvad, Yutaro Tomiyama, Toshiyuki Hirano, Toshihiko Hirooka, Masataka Nakazawa
  IEICE Transactions. 01/2011; 94-B:430-436.