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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 Results 1 - 20 of 66  /  [Next]  
Committee Date Time Place Paper Title / Authors Abstract Paper #
OCS, CS
(Joint)
2022-01-13
15:55
Yamaguchi Conference room 204A・B at KDDI Ishin-hall
(Primary: On-site, Secondary: Online)
Performance comparison of injection-locked carrier frequency conversion and self-heterodyne detection methods in coherently-linked optical and wireless transmission
Taisei Sato, Koichi Shirahata, Keisuke Kasai, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa (Tohoku Univ.) OCS2021-34
We have demonstrated a coherently-linked 64 Gbit/s, 256 QAM transmission in the 61 GHz IF band over a 10 km single-mode ... [more] OCS2021-34
pp.7-10
OFT 2021-05-14
13:45
Online Online BER performance improvement of ultrahigh-speed coherent Nyquist pulse transmission using low-nonlinearity, dispersion-compensated transmission line with chirped FBG and LCoS
Kosuke Kimura, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OFT2021-7
We demonstrate a low-nonlinearity, dispersion-compensated transmission line composed of a chirped FBG and an LCoS device... [more] OFT2021-7
pp.27-30
SR 2021-01-25
11:00
Online Online [Invited Talk] Toward optical and wireless integrated full-coherent access network
Toshihiko Hirooka, Keisuke Kasai, Masato Yoshida, Masataka Nakazawa (Tohoku Univ.) SR2020-49
We have proposed a coherently-linked optical and wireless transmission system toward a large-capacity radio access netwo... [more] SR2020-49
pp.15-20
OCS, CS
(Joint)
2021-01-14
14:55
Online Online Study on chromatic dispersion dependence of GAWBS noise
Kozo Sato, Takashi Kan, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OCS2020-30
We have proposed the guided acoustic-wave Brillouin scattering (GAWBS) phase noise compensation method with a pilot tone... [more] OCS2020-30
pp.18-23
OCS, CS
(Joint)
2021-01-15
14:25
Online Online 12.8 Tbit/s (1.28 Tbit/s/ch x 10) OTDM-WDM Transmission of PDM-DQPSK Optical Nyquist Pulses over 1500 km
Aoi Watanabe, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa (Tohoku Univ.) OCS2020-37
Motivated by the rapid increase in global data traffic, ultrahigh-speed transmission with a single-channel bit rate exce... [more] OCS2020-37
pp.50-54
OCS, OFT, LSJ
(Joint) [detail]
2020-08-28
15:15
Online Online Experimental and theoretical analyses of GAWBS phase noise in multi-core fiber for digital coherent transmission
Masato Yoshida, Naoya Takefushi, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OCS2020-7
(Advance abstract in Japanese is available) [more] OCS2020-7
pp.15-20
RCS, SR, SRW
(Joint)
2020-03-04
09:00
Tokyo Tokyo Institute of Technology
(Cancelled but technical report was issued)
R&D of Technology for High Reliability Management of Advanced 5G Network to Various Requirements of Communication Services
Takahide Murakami, Hiroyuki Shinbo, Yu Tsukamoto, Shinobu Nanba, Yoji Kishi (KDDI Research), Morihiko Tamai, Hiroyuki Yokoyama (ATR), Takanori Hara, Koji Ishibashi (The University of Electro-Communications), Kensuke Tsuda, Yoshimi Fujii (Kozo Keikaku Engineering Inc.), Fumiyuki Adachi, Keisuke Kasai, Masataka Nakazawa (Tohoku Univ.), Yuta Seki, Takayuki Sotoyama (Panasonic) RCS2019-320
As the 5th generation mobile communication system is widespread approximately 2025, more variety of communication qualit... [more] RCS2019-320
pp.1-6
CS, OCS
(Joint)
2020-01-16
14:45
Oita Beppu Housensou Hotel (Oita Pref.) [Invited Lecture] Next Generation C-RAN Mobile Fronthaul Using On-line Bi-directional 256 QAM WDM Coherent Transmission
Takashi Kan, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa (Tohoku Univ.) OCS2019-73
We have recently proposed a simple digital coherent transmission system with an injection locking technique for next gen... [more] OCS2019-73
pp.47-52
OCS, PN, NS
(Joint)
2019-06-20
10:35
Iwate MALIOS(Morioka) Sub-Picosecond Optical Switch over Entire C-Band by Using Nonlinear Optical Loop Mirror
Ryoya Hirata, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa (Tohoku Univ.) OCS2019-10
Ultrafast optical switches have many useful applications ranging from ultrahigh-speed optical communication to signal pr... [more] OCS2019-10
pp.1-4
OCS, PN, NS
(Joint)
2019-06-20
11:00
Iwate MALIOS(Morioka) GAWBS noise characteristics in digital coherent transmission in various optical fibers
Naoya Takefushi, Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OCS2019-11
(Advance abstract in Japanese is available) [more] OCS2019-11
pp.5-10
OCS, PN, NS
(Joint)
2019-06-21
16:00
Iwate MALIOS(Morioka) 50.4 Tbit/s, L-band 480 ch-WDM, 128 QAM-160 km digital coherent optical transmission using an injection-locked homodyne receiver
Takashi Kan, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OCS2019-19
Injection locking method enables us to realize precise optical carrier-phase synchronization between transmitted data an... [more] OCS2019-19
pp.47-50
RCS, SR, SRW
(Joint)
2019-03-08
10:30
Kanagawa YRP 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), Jun Terada, Satoshi Shigematsu, Yasushi Takatori (NTT), Hiroaki Asano (Panasonic), Yukio Hirano (Mitsubishi Electric), Yasushi Yamao (UEC), Fumiyuki Adachi, Masataka Nakazawa (Tohoku Univ.) RCS2018-323
In this paper, we make a summary report of our 5G R&D activities for “High Capacity Technologies with Ultra High-Density... [more] RCS2018-323
pp.207-212
OCS, CS
(Joint)
2019-01-17
17:15
Okinawa Nobumoto Ohama Memorial Hall (Ishigaki Island) [Invited Lecture] 160 Gbit/s, 256 QAM bidirectional coherent transmission for next generation mobile fronthaul
Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Katsumi Iwatsuki, Masataka Nakazawa (Tohoku Univ.) CS2018-95 OCS2018-75
We have recently proposed a simple digital coherent transmission system with an injection locking technique for a next g... [more] CS2018-95 OCS2018-75
pp.47-52(CS), pp.41-46(OCS)
OCS, CS
(Joint)
2019-01-17
17:40
Okinawa Nobumoto Ohama Memorial Hall (Ishigaki Island) [Invited Lecture] Dual-polarization real-time 256~512 QAM digital coherent transmission
Masato Yoshida, Keisuke Kasai, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) CS2018-96 OCS2018-76
(Advance abstract in Japanese is available) [more] CS2018-96 OCS2018-76
pp.53-58(CS), pp.47-52(OCS)
LQE, OPE, SIPH 2018-12-06
17:10
Tokyo Keio University Full C+L-Band, Mode Hop Free Wavelength Tunable LD with a Linewidth of Less than 8 kHz
Keisuke Kasai, Masataka Nakazawa (Tohoku Univ.), Yasunori Tomomatsu, Takashi Endo (Koshin Kogaku) OPE2018-109 LQE2018-119 SIPH2018-25
We present a full 90-nm C+L-band (1530-1620 nm) mode hop free wavelength tunable LD in which we developed a new waveleng... [more] OPE2018-109 LQE2018-119 SIPH2018-25
pp.59-62
OFT 2018-10-11
14:00
Miyagi Touhoku Univ. [Poster Presentation] Single-channel 10.2 Tbit/s Optical Nyquist Pulse Transmission over 300 km
Ryoya Hirata, Jianping Wang, Toshihiko Hirooka, Masato Yoshida, Masataka Nakazawa (Tohoku Univ.) OFT2018-26
We have proposed an optical Nyquist pulse and its orthogonal TDM scheme for high-speed and high spectrally efficient tra... [more] OFT2018-26
pp.61-66
OFT 2018-10-11
14:00
Miyagi Touhoku Univ. [Poster Presentation] Single-channel 7.68 Tbit/s, 64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 9.7 bit/s/Hz
Kosuke Kimura, Nitta Junpei, Masato Yoshida, Keisuke Kasai, Toshiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OFT2018-27
We achieved a record capacity of 7.68 Tbit/s in a single channel coherent Nyquist pulse transmission over 150 km with a ... [more] OFT2018-27
pp.67-71
OFT 2018-10-11
14:00
Miyagi Touhoku Univ. [Poster Presentation] 12 bit/s/Hz, 58.2 Tbit/s, 256 QAM-160 km C-band WDM Transmission Using an Injection Locking Technique
Takashi Kan, Keisuke Kasai, Masato Yoshida, Toshihiko Hirooka, Masataka Nakazawa (Tohoku Univ.) OFT2018-28
Injection locking can realize precise carrier-phase synchronization between the transmitted data and a local oscillator ... [more] OFT2018-28
pp.73-77
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
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