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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 Results 1 - 20 of 36  /  [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
ED, THz 2021-12-20
13:00
Miyagi
(Primary: On-site, Secondary: Online)
[Invited Talk] Recent Progress in Carrier Down-Conversion Devices Between Optical Communication and Beyond 5G Wireless Communication
Akira Satou, Dai Nakajima, Kazuki Nishimura, Tomotaka Hosotani, Katsumi Iwatsuki, Tetsuya Suemitsu, Keisuke Kasai, Masato Yoshida, Taiichi Otsuji (Tohoku Univ.) ED2021-48
echnologies that seamlessly converges optical networks and wireless networks with small delay and low power consumption ... [more] ED2021-48
pp.1-5
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, 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
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
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 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
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
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
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