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All Technical Committee Conferences (Searched in: All Years)
| Committee | Date Time | Place | Paper Title / Authors | Abstract | Paper # | |
| OFT | 2018-10-11 14:00 |
Miyagi | Touhoku Univ. | [Poster Presentation]
Observation of GAWBS noise and development of its compensation technique in digital coherent optical transmission Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.)  OFT2018-29 |
Guided acoustic-wave Brillouin scattering (GAWBS) noise is an optical phase fluctuation that occurs coherently with ther... [more] | OFT2018-29 pp.79-83 |
| EMD, LQE, OPE, CPM, R | 2018-08-24 13:40 |
Hokkaido | Otaru Camber of Commerce & Industry | Oscillation chracteristics of a narrow linewidth DFB LD array with an optical feedback method Keisuke Kasai, Masataka Nakazawa (Tohoku Univ.) R2018-31 EMD2018-34 CPM2018-34 OPE2018-61 LQE2018-50 |
We describe a 1.5 m, narrow linewidth, high output power wavelength tunable LD with a self-optical feedback circuit. By... [more] | R2018-31 EMD2018-34 CPM2018-34 OPE2018-61 LQE2018-50 pp.73-78 |
| CS, OCS (Joint) |
2018-01-29 15:45 |
Ehime | Ehime University | 80 Gbit/s, 256 QAM digital coherent optical transmission with injection-locking for next generation mobile fronthaul Keisuke Kasai, Yixing Wang, Masato Yoshida, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa (Tohoku Univ.) OCS2017-70 |
We propose a simple digital coherent transmission system with injection-locking for the next generation (5G and post 5G)... [more] | OCS2017-70 pp.19-24 |
| R, EMD, CPM, LQE, OPE | 2017-09-01 11:30 |
Aomori | A full C-band wavelength tunable laser diode with narrow linewidth and low intensity noise characteristics Keisuke Kasai, Masataka Nakazawa (Tohoku Univ.), Yasunori Tomomatsu, Takashi Endo (Koshin Kogaku) R2017-36 EMD2017-30 CPM2017-51 OPE2017-60 LQE2017-33 |
We demonstrate a narrow-linewidth, low-intensity noise, widely wavelength-tunable LD for which we adopted a long externa... [more] | R2017-36 EMD2017-30 CPM2017-51 OPE2017-60 LQE2017-33 pp.59-64 |
|
| OFT, OCS, IEE-CMN, ITE-BCT [detail] | 2016-11-11 09:30 |
Nagasaki | Nagasaki Shoko Kaigi Sho | Fabrication of a multi-core fiber by using a slurry casting method Jun Yamamoto, Tamotsu Yajima, Yusuke Kinoshita, Futoshi Ishii (Kohokoku Kogyo), Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OFT2016-30 |
We fabricated a 7 core multi-core fiber (MCF) using a slurry casting method with a highly pure SiO2 powder as a starting... [more] | OFT2016-30 pp.29-33 |
| LQE, OPE, EMD, R, CPM | 2016-08-25 11:05 |
Hokkaido | A 295 mW output, frequency-stabilized erbium silica fiber laser Keisuke Kasai, Masato Yoshida, Masataka Nakazawa (Tohoku Univ.) R2016-23 EMD2016-27 CPM2016-36 OPE2016-57 LQE2016-32 |
We demonstrate the frequency stabilization of a high output power, erbium silica fiber laser by utilizing an acetylene a... [more] | R2016-23 EMD2016-27 CPM2016-36 OPE2016-57 LQE2016-32 pp.21-26 |
|
| NS, RCS (Joint) |
2015-12-17 13:30 |
Ehime | Matsuyama Community Center | [Invited Lecture]
5G R&D Activities for High Capacity Technologies with Ultra High-Density Multi-Band and Multi-Access Layered Cells Morihiko Minowa, Hiroyuki Seki (Fujitsu), Yukihiko Okumura, Satoshi Suyama (NTT DOCOMO), Akihiro Otaka, Shunji Kimura, Masashi Nakatsugawa (NTT), Hiroaki Asano, Yasufumi Ichikawa (Panasonic), Yukio Hirano (Mitsubishi Electric), Yasushi Yamao (UEC), Fumiyuki Adachi (Tohoku University), Masataka Nakazawa (Tohoku Univ.) NS2015-134 RCS2015-250 |
In this report, we introduce our 5G R&D activities for “High Capacity Technologies with Ultra High-Density Multi-Band an... [more] | NS2015-134 RCS2015-250 pp.43-48(NS), pp.41-46(RCS) |
| OCS | 2015-07-30 10:00 |
Tokyo | Tokyo Tech Front | 1.92 Tbit/s/ch, 64 QAM coherent Nyquist orthogonal TDM transmission with a spectral efficiency of 10.6 bit/s/Hz David Odeke Otuya, Koudai Harako, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OCS2015-26 |
(Advance abstract in Japanese is available) [more] | OCS2015-26 pp.7-12 |
| QIT (2nd) |
2014-11-18 13:30 |
Miyagi | Tohoku Univ. | QAM quantum stream cipher using digital coherent optical transmission Masataka Nakazawa, Masato Yoshida, Toshihiko Hirooka, Keisuke Kasai (Tohoku Univ.) |
[more] | |
| MWP | 2014-11-05 13:30 |
Miyagi | RIEC, Tohoku Univ. | [Special Invited Talk]
Resilient ICT research activities of ROEC at Tohoku University and its cooperation with NICT Masataka Nakazawa (Tohoku Univ.) MWP2014-42 |
[more] | MWP2014-42 pp.1-6 |
| OCS, OPE, LQE | 2014-10-30 14:05 |
Nagasaki | Nagasaki Museum of History and Culture | High-performance TDM demultiplexing of coherent Nyquist pulses using time-domain orthogonality Koudai Harako, David Odeke Otuya, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa (TohokuUniv.) OCS2014-60 OPE2014-104 LQE2014-78 |
We propose a simple and high-performance scheme for demultiplexing coherent Nyquist TDM signals by photo-mixing on a pho... [more] | OCS2014-60 OPE2014-104 LQE2014-78 pp.97-100 |
| OFT | 2014-01-24 14:30 |
Tokyo | Investigation of the Influence of Fusion Splice on Crosstalk Properties of Multicore Fiber Katsunori Imamura, Ryuichi Sugizaki, Takeshi Yagi (Furukawa Electric), Masato Yoshida, Masataka Nakazawa (Tohoku Univ.) OFT2013-48 |
We investigated the relationship between splice loss and crosstalk properties in the fusion spliced multicore fibers. We... [more] | OFT2013-48 pp.11-15 |
|
| LQE, CPM, EMD, OPE, R | 2012-08-23 11:50 |
Miyagi | Tohoku Univ. | Performance improvement of optical frequency stabilized Cs optical atomic clock Kazunari Tokuhira, Fumitaka Suzuki, Masato Yoshida, Masataka Nakazawa (Tohoku Univ.) R2012-25 EMD2012-31 CPM2012-56 OPE2012-63 LQE2012-29 |
We have proposed a Cs optical atomic clock, which carries a atandard microwave clock signal with an optical pulse. The c... [more] | R2012-25 EMD2012-31 CPM2012-56 OPE2012-63 LQE2012-29 pp.21-25 |
| LQE, CPM, EMD, OPE, R | 2012-08-24 09:30 |
Miyagi | Tohoku Univ. | 1.07μm passively mde-locked Ytterbium-doped fiber laser with SWNT/PMMA saturable absorber Masato Yoshida, Yuichiro Hori, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) R2012-37 EMD2012-43 CPM2012-68 OPE2012-75 LQE2012-41 |
Single-wall carbon nanotubes (SWNT) have received considerable attention as a nonlinear optical material for ultrashort ... [more] | R2012-37 EMD2012-43 CPM2012-68 OPE2012-75 LQE2012-41 pp.83-86 |
| LQE, CPM, EMD, OPE, R | 2012-08-24 09:55 |
Miyagi | Tohoku Univ. | Increase of Output Power of Passively Mode-Locked Fiber Laser with a SWNT Takato Ono, Yuichiro Hori, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.), Junji Mata, Jun Tsukamoto (Toray) R2012-38 EMD2012-44 CPM2012-69 OPE2012-76 LQE2012-42 |
We have demonstrated a passively mode-locked fiber laser with SWNT-based saturable absorbers made by uniformly dispersin... [more] | R2012-38 EMD2012-44 CPM2012-69 OPE2012-76 LQE2012-42 pp.87-90 |
| OCS | 2012-07-26 14:05 |
Shizuoka | 32 RZ/QAM coherent optical transmission employing an RZ-CW conversion technique Keisuke Kasai, David Odeke Otuya, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OCS2012-23 |
Coherent optical time division multiplexing (OTDM) transmission with a multi-level modulation format has attracted a lot... [more] | OCS2012-23 pp.13-18 |
|
| NS, OCS, PN (Joint) |
2012-06-22 11:15 |
Yamagata | Yamagata Univ. | Demultiplexing of 160 Gbit/s OTDM signal using a nonlinear optical loop mirror at 1.1μm Kengo Koizumi, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa (Tohoku Univ.) OCS2012-18 |
(Advance abstract in Japanese is available) [more] | OCS2012-18 pp.47-52 |
| OCS, OPE (Joint) |
2012-05-18 09:30 |
Tokyo | Kikai-Shinko-Kaikan Bldg(Tokyo) | Depolarization-induced crosstalk in polarization-multiplexed transmission and its impact on ultrahigh-speed optical transmission Toshihiko Hirooka, Koudai Harako, Pengyu Guan, Masataka Nakazawa (Tohoku Univ.) OCS2012-1 |
Ultrashort optical pulses such as used in a single-channel Terabit/s OTDM transmission suffers from significant transmis... [more] | OCS2012-1 pp.1-4 |
| CPM, OPE, LQE, EMD | 2011-08-25 16:00 |
Hokkaido | Hokkaido Univ. | Oscillation characteristics of a <sup>13</sup>C<sub>2</sub>H<sub>2</sub> frequency-stabilized λ/4-shifted DFB laser diode with an external fiber ring cavity Keisuke Kasai, Masataka Nakazawa (Tohoku Univ.) EMD2011-41 CPM2011-85 OPE2011-76 LQE2011-39 |
We demonstrate frequency stabilization of a $lambda$/4-shifted distributed feedback laser diode (DFB LD) with an externa... [more] | EMD2011-41 CPM2011-85 OPE2011-76 LQE2011-39 pp.49-52 |
| OCS | 2011-07-11 13:40 |
Osaka | Osaka Univ. Nakanoshima Center | Development of FPGA-based real-time receiver for 64 QAM coherent signals Masato Yoshida, Tatsunori Omiya, Keisuke Kasai, Masataka Nakazawa (Tohoku Univ.) OCS2011-27 |
(Advance abstract in Japanese is available) [more] | OCS2011-27 pp.7-12 |
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