Ultrafast Optical Logics at 200 Gbit/s and beyond:
we're exploring advanced functions for building ultrahigh-speed optical-logic systems instead of the conventional electronic ones. We study their fundamental properties in the pulse-CW gating regime (e.g. wavelength conversion and 2R regeneration in the optical communications systems) and in the pulse-pulse gating regime (e.g. 3R regeneration).
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Ultrahigh-Frequency Optical-Clock Generation:
we're studying our original ultrahigh-frequency, ultrashort, mode-locked pulse laser scheme that contains an SMZ-DISC-type wavelength-convertor structure. We're designing and characterizing its ring cavity in the following three domains, that is, in the time domain [ps], in the optical-frequency domain [THz], and in the radio-frequency domain [GHz], almost independently.
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Yoshiyasu Ueno, 'Roadmap of ultrafast energy-saving optical semiconductor devices to Year 2025 (Invited talk),'
Japanese Society of Applied Physics,
Hiratsuka city, Kanagawa, Japan, March 17-20, 2010.
New! Takehiro Nishida, Satoshi Shinada, Naoya Wada, Takeru Yamaji, and Yoshiyasu Ueno,
"Ultrafast distortion-free semiconductor-based all-optical gate that contains optical-spectrum's phase-and-amplitude synthesizer,"
22nd Annual Meeting of IEEE Photonics Society, Oct. 4-8, 2009, Belek-Antalya, Turkey, paper no. TuB4.
full text
Jun Sakaguchi, Takehiro Nishida, and Yoshiyasu Ueno,
"200-Gb/s wavelength conversion using a delayed-interference all-optical semiconductor gate assisted by nonlinear polarization rotation,"
Optics Communications vol. 282, no. 9, pp. 1728-1733, May 2009.
abstract , full text
Yoshiyasu Ueno, 'Recent trends in the research of ultrafast, all-optical semiconductor gate devices (Invited talk),'
OCS-OPE-LQE symposium, Institute of Electronics, Information, and Communication Engineers (IEICE), Kawasaki, Japan, Sept. 16-19, 2008,
paper BCI-1-6.
full text (in Japanese)
Ryoichi Nakamoto, Hiroyuki Takeuchi, Jun Sakaguchi, and Yoshiyasu Ueno,
"1.55-um, mode-locked, single-longitudinal-mode, 10-GHz, 2-ps, ultra-short optical pulse train from our original semiconductor-based pulse-source scheme,"
Topical Conference on Nanophotonics (NANO), Optical Society of America, May 26-29, 2008, Southeast Univ., Nanjing, P.R. China, paper no. Nano-08-191.
Jun Sakaguchi, "200-Gb/s waveform analysis of ultrafast all-optical semiconductor gates towards low-power consumption operation,"
June 26, 2008, PhD thesis, fully qualified by the COE program's standard in National University of Electro-Communications, Tokyo, Japan.
full text in English (4.6MB)
Jun Sakaguchi, Mads L. Nielsen, Takashi Ohira, Rei Suzuki, and Yoshiyasu Ueno,
"Analysis of sub-pulse generation from the delayed-interference signal-wavelength converter for a wide carrier recovery rate range,"
Jpn. J. Appl. Phys. vol. 47, no. 9, pp. 7182-7189, Sept. 2008.
abstract ,
full text
Prof. Jian Wu,
Key Laboratory of Information Photonics and Optical Communications, Beijing Univ. of Posts and Telecommunications (BUPT), Beijing, P.R. China.
Prof. Taro Arakawa, Yokohama National University, Yokohama city.
Prof. Hiroyuki Uenohara, Tokyo Institute of Technology, Suzukake-dai campus, Yokohama city.
the 8th Lab-members Camp in rural Lodge (10 research students and Ueno),
UEC Sugadaira-Heights Seminar House, Ueda city, Nagano prefecture, Sept. 16-18, 2011.
Drs. Naoya Wada and Satoshi Shinada, National Institute of Information and Communications Technology (NICT), Tokyo.
Prof. Jian Wu, Key Laboratory of Information Photonics and Optical Communications, Beijing Univ. of Posts and Telecommunications (BUPT), Beijing, P.R. China.
the 5th Lab-members Camp in rural Lodge, the University Seminar House,
Hachioji city, May 21-22, 2010.
Dr. Naoya Wada, National Institute of Information and Communications Technology (NICT), Tokyo.
Dr. Satoshi Shinada, National Institute of Information and Communications Technology (NICT), Tokyo.
Dr. Kiyoshi Asakawa, National Institutr for Materials Science (NIMS), Tsukuba, Ibaraki.
Dr. Nobuhiko Ozaki, TARA center, University of Tsukuba, Tsukuba, Ibaraki.
Prof. Jian Wu, Key Laboratory of Information Photonics and Optical Communications, Beijing Univ. of Posts and Telecommunications (BUPT), Beijing, P.R. China.
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*1: Hetian Jia was approved on Nov. 2008 to hold a class-studentship from April until September, 2009,
*2: He cancelled to start the studentship (Feb. 2009).
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the third-year Spring School,
the University Seminar House, Hachioji city, May 15-16, 2009.
Dr. Kiyoshi Asakawa, National Institutr for Materials Science (NIMS), Tsukuba, Ibaraki
Dr. Nobuhiko Ozaki, TARA center, University of Tsukuba, Tsukuba, Ibaraki
Dr. Satoshi Shinada, National Institute of Information and Communications Technology (NICT), Tokyo
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*1: J. Sakaguchi received his PhD degree in June 2008, and moved to a posdoc position in another academic group,
*2: Pei Yu stays from Jan. 9, 2008 through Sept. 2008.
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the second-year Spring School,
the University Seminar House, Hachioji city, May 16-17, 2008.
Eindhoven Univ. of Technology, COBRA, Eindhoven, Netherlands: H.J.S. Dorren, H. de Waardt, E. Tangdiongga, Y. Liu, A.M.J. Koonen, M. Smit, G.D. Khoe, et al.
University of Karlsruhe, Karlsruhe, Germany: J. Leuthold, et al.
Technical University of Denmark, COM, Copenhagen (Lyngby), Denmark: Kristian Stubkjaer, J. Mørk, M.L. Nielsen, Leif K. Oxenløwe, P. Jeppesen, et al.
Univ. Southern California, USA: Alan E. Willner, et al.
Purdue University, Indiana, USA: Andrew M. Weiner, et al.
Heinrich Herz Institute of Technology, Berlin, Germany: R. Ludwig, B. Sartorius, H-P. Nolting, H.G. Weber, et al.
Univ. College Cork, Cork, Ireland: D. Cotter, R. Manning, A. Ellis, et al.
MIT Lincoln Lab., Boston, MA, USA: S. Hamilton, B. Robinson, et al.
Massachusetts Institute of Technology, Boston, USA: E.P. Ippen, et al.
Univ. California Santa Barbara, CA, USA: J.E. Bowers, D. Blumenthal, L. Coldren, et al.
Univ. Central Florida, Orlando, USA: P. Delfyett, G. Li, G.I. Stegeman, P. Li KamWa, et al.
Beijing Univ. of Posts and Telecommunications, Beijing, P.R. China: Jian Wu, Xiaobin Hong, Jinton Lin.
National Technical University of Athens, Athens, Greece: H. Avramopoulos, et al.
Univ. California Davis, CA, USA: B. Yoo, et al.
Univ. Cambridge, UK: R.V. Penty, et al.
Princeton Univ., Princeton, NJ, USA: P. Prucnal, I. Glesk et al.
Federal Institute of Technology, Zurich, Switzerland: H. Melchior, G. Guekos, et al.
Univ. of Tokushima, Tokushima: K. Tajima, et al.
Univ. Tsukuba, Tsukuba: K. Asakawa, Y. Sugimoto, et al.
National Institute of Advanced Industrial Science and Technol. (AIST), Tsukuba: H. Ishikawa, S. Ohkouchi, A. Onae, K. Minoshima, F-L. Hong, H. Tsuchida
Univ. Tokyo, Tokyo: Y. Nakano, Y. Arakawa, K. Kikuchi, S. Yamashita, T. Kamiya, M.K. Gonokami, et al.
Nara Institute of Science and Technol., Nara: H. Kawaguchi, et al.
National Defense Academy, Tokyo: M. Saruwatari, K. Tsuji, et al.
Tohoku University, Sendai: M. Nakazawa, et al.
National Institute of Information and Commun. Technol. (NICT), Koganei, Tokyo: T. Miyazaki, N. Wada, K.S. Abedin, M. Tsuchiya, Y. Matsushima, et al.
Tokyo Institute of Technology, Kanagawa: H. Uenohara, K. Kobayashi, T. Mizumoto, et al.
Tokyo Univ. of Agriculture and Technology, Tokyo: R. Lang
Osaka University: M. Matsumoto, K. Itoh, et al.
Univ. Electro-Communications, Tokyo: N. Kishi, M. Matsuura, K. Yamaguchi, K. Ueda, T. Miki, K. Hakuta, et al.
industry
KDDI R&D Labs., Kamifukuoka, Saitama: K. Nishimura, T. Yazaki, M. Hattori, M. Usami, Y. Matsushima, et al.
NEC R&D Labs., Tsukuba, Ibaraki: S. Nakamura, I. Ogura, Y. Hashimoto, T. Sasaki, et al.
NTT Photonics Labs., Atsugi, Kanagawa: Y. Yoshikuni, T. Segawa, H. Suzuki, M. Kodama, et al.
Fujitsu R&D Labs., Atsugi, Kanagawa: T. Akiyama, H. Kuwatsuka, et al.
Oki Electric R&D Labs., Hachioji, Tokyo: K. Fujii, H. Tsuji, H. Ogawa, et al.
Mitsubishi R&D Labs.
Anritsu R&D Labs., Atsugi, Kanagawa: A. Otani, et al.
Center for Integrated Photonics (previously British Telecom Labs.), Ipswich, UK: A.J. Poustie, G. Maxwell, et al.
Alcatel R&D Labs., Stuttgart, Germany: E. Lach, et al.
Lucent Technology, Bell Labs., Holmdel, NJ, USA: G. Raybon, et al.
Alphion, NJ, USA: J. Sarathy, B. Stefanov, L. Spiekman, et al.
Oct. 25-27, 2010: Laboratory member's 12th travel to research conference outside Japan
(since 2005, excluding those of supervisor professor and posdoc researcher).
For supervisor professor Y. Ueno, this is the 5th travel to mainland China.
The conference is 5th Triangle Symposium on Advanced Information and Communication Technology (TriSAI),
annually held between BUPT (Beijing, P.R. China), KAIST (Daejeon, Korea), and UEC (Tokyo, Japan).
Sept. 24-25, 2010: Lab-members Camp in rural Lodge, #6, University Seminar House, in hill-side area, Hachioji city, Tokyo. Ten students and one adviser professor.
May 21-22, 2010: Lab-members Camp in rural Lodge, #5, University Seminar House, in hill-side area, Hachioji city, Tokyo. Eleven students and one adviser professor.
Total number of attendees was 13 persons, including the one potential applicant from industry in Japan to doctor-course research in our research laboratory.
Dec. 15, 2009: Applications of new Undergraduate Researh Students Kyohei Hirai and Keita Yoshikawa to our research laboratory were approved by adviser professor Ueno.
(Those of Taijun Kato and Akihisa Yorozu were approved later on April 7th, 2010.)
Nov. 20-23, 2009 (two days of the four): Open Laboratory, 2009-3.
Oct. 5, 2009: One of the scholarshiped-exchange students Mr. Huan Wang arrived from BUPT Beijing at UEC Tokyo last week, and started his post-graduate-level research-oriented studies in our research lab from this week.
Oct. 04-08, 2009: One of master-course students (T. N.) presents one of our collaboration-research achievements at IEEE Photonics Society's Annual Meeting, Antalya, Turkey.
September 28-30, 2009: Lab-members Camp in rural Lodge, #4, Takao-no-Mori Waku-waku Village, Hachioji city, Tokyo.
August 15, 2009: Informal lab event between present members (Mt. Sannotoh, Tanzawa area, Kanagawa).
July 19, 2009: Open Laboratory, 2009-2.
May 23, 2009: Open Laboratory, 2009-1.
May 15-16, 2009: Lab-members Camp in rural Lodge, #3, University Seminar House, Hachioji city, Tokyo.
Dec. 16, 2008: Four new undergrad members joined our laboratory. (Another new member joined on April 9, 2009.)
June 26, 2008: Jun Sakaguchi received his COE-standard PhD degree
defined by the 21st-Century Center of Excelence (COE) course 'Innovation in Coherent Optical Science,"
of the Univ. of Electro-Communications. *) His thesis "200-Gb/s waveform analysis of ultrafast all-optical semiconductor gates towards low-power consumption operation" has been approved by the six thesis-examiners
(Profs. K. Yamaguchi, K. Ueda, T. Okuno, N. Kishi, T. Kamiya, and Y. Ueno)
and the three international reviewers (Profs. J. Mørk from Denmark, J. Leuthold from Germany, and H. Dorren from the Netherlands).
May 16-17, 2008: Spring School of lab members in rural Lodge, #2, University Seminar House, Hachioji city, Tokyo.
Sept. 18-20, 2007: Japan-China-Korea inter-university, 2nd Triangle Forum (R. Nakamoto, M. Honma, and Y. Ueno), Beijing University of Posts and Telecommunications, Beijing, P.R. China.
Sept. 6-14, 2007: Short stays in COBRA Research Institute, Eindhoven Univ. of Technology, and Research Center COM, Technical Univ. of Denmark (Y. Ueno).
May 11-12, 2007:
Spring School of lab members in rural Lodge, #1, University Seminar House, Hachioji city, Tokyo.
Nov. 5, 2006: Informal lab event between present and alumni members.
May 13, 2006: Informal lab event between present and alumni members.
May 12, 2006: News release to a daily industrial newspaper, Nikkan Kogyo Shinbun (Japanese), about the successful 40-GHz pulse generation in our original scheme.
Feb. 18-19, 2006: Informal lab event: lab members' tour to a ski resort in Mt. Adatara, Fukushima, Japan.
September 2005: Dr. Ferran Salleras Vila joined us from the Swiss Federal Institute of Technology (EPFL, Lausanne, Prof. Benoit Deveaud), as a research associate.
July 2005: Second international research collaboration with Technical Univ. Denmark.
June 22, 2005: Grant-awarded from NEDO (collaboration research between Univ. Tsukuba, AIST, NEC, and us Univ. Electro-Comm., FY 2005-2007).
May 22, 2005: Informal lab event between present and alumni members (Mt. Sannotoh, Tanzawa area, Kanagawa).
July 18 & Nov. 19-20, 2004: Open Laboratory.
July-August, 2004: International resesarch collaboration with Technical Univ. Denmark.
May 15, 2004: Informal lab event between present and alumni members.
April 30th, 2004: Laboratory space was expanded to 120 m2.
Oct. 2003: Grant awarded from the Ministry of Education (FY 2003-2005).
Yoshiyasu Ueno, Professor
Jun Sakaguchi, PhD course
Ferran Salleras Vila, Dr., Research Associate
Masashi Toyoda, M1
Sumio Ichinohe, U4
