Masataka Nakazawa

Summary

Affiliation: Tohoku University
Country: Japan

Publications

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. doi request reprint 131 fs, 33 MHz all-fiber soliton laser at 1.07 microm with a film-type SWNT saturable absorber coated on polyimide
    Fumio Shohda
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai, 980 8577, Japan
    Opt Express 18:11223-9. 2010
  7. doi request reprint 1024 QAM (60 Gbit/s) single-carrier coherent optical transmission over 150 km
    Yuki Koizumi
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai shi, Miyagiken 980 8577 Japan
    Opt Express 20:12508-14. 2012
  8. 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
  9. 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
  10. doi request reprint 400 Gbit/s 256 QAM-OFDM transmission over 720 km with a 14 bit/s/Hz spectral efficiency by using high-resolution FDE
    Tatsunori Omiya
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai shi, Miyagi ken, 980 8577 Japan
    Opt Express 21:2632-41. 2013

Collaborators

Detail Information

Publications16

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. doi request reprint 131 fs, 33 MHz all-fiber soliton laser at 1.07 microm with a film-type SWNT saturable absorber coated on polyimide
    Fumio Shohda
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai, 980 8577, Japan
    Opt Express 18:11223-9. 2010
    ..07 microm. As a result, a 131 fs, 33 MHz pulse was successfully generated with a simple laser configuration...
  7. doi request reprint 1024 QAM (60 Gbit/s) single-carrier coherent optical transmission over 150 km
    Yuki Koizumi
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai shi, Miyagiken 980 8577 Japan
    Opt Express 20:12508-14. 2012
    ..As a result, 60 Gbit/s polarization-multiplexed transmission over 150-km has been achieved at 3 Gsymbol/s within an optical bandwidth of only 4.05 GHz...
  8. 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...
  9. 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
    ....
  10. doi request reprint 400 Gbit/s 256 QAM-OFDM transmission over 720 km with a 14 bit/s/Hz spectral efficiency by using high-resolution FDE
    Tatsunori Omiya
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Sendai shi, Miyagi ken, 980 8577 Japan
    Opt Express 21:2632-41. 2013
    ..A detailed analytical evaluation of the 256 QAM-OFDM transmission is also provided, which clarifies the influence of quantization error in the digital coherent receiver on the waveform distortion compensation with DBP...
  11. doi request reprint An 88 fs fiber soliton laser using a quantum well saturable absorber with an ultrafast intersubband transition
    Fumio Shohda
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai, 980 8577 Japan
    Opt Express 17:22499-504. 2009
    ..We designed the laser cavity as a soliton laser, which enabled us to generate a stable pulse. As a result, an 88 fs, 42 MHz soliton pulse was successfully generated...
  12. 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...
  13. ncbi request reprint 147 fs, 51 MHz soliton fiber laser at 1.56 microm with a fiber-connector-type SWNT/P3HT saturable absorber
    Fumio Shohda
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai, 980 8577 Japan
    Opt Express 16:20943-8. 2008
    ..We used a soliton cavity configuration to generate the shortest pulse (147 fs) at the highest repetition rate (51 MHz) yet obtained with carbon nanotubes (CNT) related saturable absorbers...
  14. 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...
  15. ncbi request reprint 64 and 128 coherent QAM optical transmission over 150 km using frequency-stabilized laser and heterodyne PLL detection
    Masato Yoshida
    Research Institute of Electrical Communication, Tohoku University, 2 1 1 Katahira, Aoba ku, Sendai shi, Miyagi ken, 980 8577 Japan
    Opt Express 16:829-40. 2008
    ....
  16. 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...