Toshihiko Hirooka

Summary

Affiliation: Tohoku University
Country: Japan

Publications

  1. doi request reprint Linear and nonlinear propagation of optical Nyquist pulses in fibers
    Toshihiko Hirooka
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai shi, Miyagi ken, 980 8577 Japan
    Opt Express 20:19836-49. 2012
  2. doi request reprint Highly dispersion-tolerant 160 Gbaud optical Nyquist pulse TDM transmission over 525 km
    Toshihiko Hirooka
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai shi, Miyagiken, 980 8577 Japan
    Opt Express 20:15001-7. 2012
  3. doi request reprint 512 QAM transmission over 240 km using frequency-domain equalization in a digital coherent receiver
    Yuki Koizumi
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai, 980 8577 Japan
    Opt Express 20:23383-9. 2012
  4. doi request reprint 160 Gbit/s-300 km single-channel transmission in the 1.1 μm band with a precise GVD and slope compensation
    Kengo Koizumi
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai shi, Miyagi ken 980 8577, Japan
    Opt Express 21:4303-10. 2013
  5. doi request reprint A 31 mW, 280 fs passively mode-locked fiber soliton laser using a high heat-resistant SWNT/P3HT saturable absorber coated with siloxane
    Takato Ono
    Research Institute of Electrical Communication, Tohoku University 2 1 1 Katahira, Sendai, 980 8577 Japan
    Opt Express 20:23659-65. 2012
  6. doi request reprint Nondestructive measurement of mode couplings along a multi-core fiber using a synchronous multi-channel OTDR
    Masataka Nakazawa
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai shi, Miyagiken 980 8577 Japan
    Opt Express 20:12530-40. 2012
  7. doi request reprint Ultrahigh-speed "orthogonal" TDM transmission with an optical Nyquist pulse train
    Masataka Nakazawa
    Research Institute of Electrical Communication, Tohoku University, Aoba ku, Sendai shi, Japan
    Opt Express 20:1129-40. 2012
  8. doi request reprint Marked performance improvement of 256 QAM transmission using a digital back-propagation method
    Kazushi Toyoda
    Research Institute of Electrical Communication, Tohoku University 2 1 1 Katahira, Aoba ku, Sendai, 980 8577 Japan
    Opt Express 20:19815-21. 2012
  9. ncbi request reprint Novel RZ-CW conversion scheme for ultra multi-level, high-speed coherent OTDM transmission
    Masataka Nakazawa
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai shi, 980 8577, Japan
    Opt Express 19:B574-80. 2011
  10. ncbi request reprint 2.56 Tbit/s/ch polarization-multiplexed DQPSK transmission over 300 km using time-domain optical Fourier transformation
    Pengyu Guan
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai, 980 8577 Japan
    Opt Express 19:B567-73. 2011

Collaborators

Detail Information

Publications11

  1. doi request reprint Linear and nonlinear propagation of optical Nyquist pulses in fibers
    Toshihiko Hirooka
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai shi, Miyagi ken, 980 8577 Japan
    Opt Express 20:19836-49. 2012
    ..We analyze how this periodic zero-crossing property is maintained or affected by the fiber dispersion and nonlinearity, and show that it is better maintained against nonlinearity in the presence of normal dispersion...
  2. doi request reprint Highly dispersion-tolerant 160 Gbaud optical Nyquist pulse TDM transmission over 525 km
    Toshihiko Hirooka
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai shi, Miyagiken, 980 8577 Japan
    Opt Express 20:15001-7. 2012
    ..By virtue of this property, a dispersion tolerance over ± 8 ps/nm was successfully realized in 160 Gbaud, 525 km transmission...
  3. doi request reprint 512 QAM transmission over 240 km using frequency-domain equalization in a digital coherent receiver
    Yuki Koizumi
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai, 980 8577 Japan
    Opt Express 20:23383-9. 2012
    ..FDE also allows the transmission distance to be extended up to 240 km...
  4. doi request reprint 160 Gbit/s-300 km single-channel transmission in the 1.1 μm band with a precise GVD and slope compensation
    Kengo Koizumi
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai shi, Miyagi ken 980 8577, Japan
    Opt Express 21:4303-10. 2013
    ..5 Gbit/s taking the 7% FEC overhead into account...
  5. doi request reprint A 31 mW, 280 fs passively mode-locked fiber soliton laser using a high heat-resistant SWNT/P3HT saturable absorber coated with siloxane
    Takato Ono
    Research Institute of Electrical Communication, Tohoku University 2 1 1 Katahira, Sendai, 980 8577 Japan
    Opt Express 20:23659-65. 2012
    ..By applying the saturable absorber to a passively mode-locked Er fiber laser, we successfully demonstrated 280 fs, 31 mW pulse generation with a fivefold improvement in heat resistance...
  6. doi request reprint Nondestructive measurement of mode couplings along a multi-core fiber using a synchronous multi-channel OTDR
    Masataka Nakazawa
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai shi, Miyagiken 980 8577 Japan
    Opt Express 20:12530-40. 2012
    ..The mode couplings along seven core fibers are successfully obtained using a synchronous seven-channel OTDR...
  7. doi request reprint Ultrahigh-speed "orthogonal" TDM transmission with an optical Nyquist pulse train
    Masataka Nakazawa
    Research Institute of Electrical Communication, Tohoku University, Aoba ku, Sendai shi, Japan
    Opt Express 20:1129-40. 2012
    ..Tolerance to GVD and the dispersion slope is significantly improved by virtue of the orthogonality, reduced bandwidth, and minimum ISI...
  8. doi request reprint Marked performance improvement of 256 QAM transmission using a digital back-propagation method
    Kazushi Toyoda
    Research Institute of Electrical Communication, Tohoku University 2 1 1 Katahira, Aoba ku, Sendai, 980 8577 Japan
    Opt Express 20:19815-21. 2012
    ....
  9. ncbi request reprint Novel RZ-CW conversion scheme for ultra multi-level, high-speed coherent OTDM transmission
    Masataka Nakazawa
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai shi, 980 8577, Japan
    Opt Express 19:B574-80. 2011
    ..The advantage of this scheme is successfully demonstrated with 10 Gsymbol/s, 4- and 8-OTDM, 32-RZ/QAM demodulation experiments...
  10. ncbi request reprint 2.56 Tbit/s/ch polarization-multiplexed DQPSK transmission over 300 km using time-domain optical Fourier transformation
    Pengyu Guan
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai, 980 8577 Japan
    Opt Express 19:B567-73. 2011
    ..The influence of inter-polarization crosstalk induced by second-order PMD, is presented in detail...
  11. doi request reprint 10 GHz, 1.1 ps optical pulse generation from a regeneratively mode-locked Yb fiber laser in the 1.1 μm band
    Kengo Koizumi
    Research Institute of Electrical Communication, Tohoku University, Sendai shi, Miyagiken, Japan
    Opt Express 19:25426-32. 2011
    ..As a result, a 1.1 ps optical pulse with a timing jitter of 140 fs was successfully generated...