Hideyuki Sotobayashi (Dr. Eng.)

Affiliation:
Department of Electrical Engineering and Electronics,
College of Science and Engineering,
Aoyama Gakuin University
5-10-1-L218 Fuchinobe, Sagamihara-shi, Kanagawa 229-8558, Japan
sotobayashi@ee.aoyama.ac.jp

also with

Research Laboratory of Electronics,
Massachusetts Institute of Technology, room 36-323,
77 Massachusetts Avenue, Cambridge, MA 02139-4307, U.S.A
Phone: +1-617-253-8949, Fax: +1-617-253-9611
E-mail: hideyuki@mit.edu
http://web.mit.edu/hideyuki/www/sotobayashi-e.html

Biography
Hideyuki Sotobayashi received the B.E. degree in electronic engineering in 1992 and the M.E. and Dr.Eng. degrees in electrical engineering from the University of Tokyo, Tokyo, Japan, in 1994 and 1997, respectively. In 1997, he joined Communications Research Laboratory (CRL), Ministry of Posts and Telecommunications (MPT), Tokyo, Japan, where he has been engaged in research on photonic networks, optical communications, photonic processing, and nonlinear optics. CRL was reorganized as "National Institute of Information and Communications Technology (NICT)" on April 1st, 2004. In 2008, he joined the Aoyama Gakuin University as an Associate Professor.

Dr. Sotobayashi is a senior member of the Institute of Electrical and Electronics Engineers (IEEE) and members of the Optical Society of America (OSA), the Institute of Electronics and Information Communication Engineers of Japan (IEICE), and the Japan Society of Applied Physics (JSAP).

Since 2002 until 2005, he was a Visiting Scientist of Massachusetts Institute of Technology.
Since 2005, he has been a Research Affiliate of Massachusetts Institute of Technology.

Index Terms
Photonics, Optics, Photonic Network, Optical communication,
Optical time division multiplexing (TDM), Wavelength division multiplexing (WDM), Optical code division multiplexing (CDM), Subcarrier multiplexing (SCM),
Photonic processing, Nonlinear optics, Ultrafast phenomena,
Photonic link, Photonic node, Photonic access,
Optical phase conjugation (OPC), Wavelength conversion, Optical time gate, Supercontinuum (SC), Photonic label switching router (LSR), Photonic routing, Photonic packet switching, Label swapping
Optical fiber, Semiconductor optical amplifier (SOA), Four wave mixing (FWM), Photonic gateway

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Journals

G. Qin, H. Sotobayashi, M. Tsuchiya, A. Mori, T. Suzuki, Y. Ohishi, "Stimulated Brillouin scattering in a single mode tellurite fiber for amplification, lasing and slow light generation," J. Lightwave Tech., vol. 26, no. 5, pp. 492-498, 2008.
G. Qin, H. Sotobayashi, M. Tsuchiya, A. Mori, Y. Ohishi, "Stimulated Brillouin amplification in a Tellurite fiber as a potential system for slow light generation," J. J. App. Phy., vol. 46, No. 34, 2007.
T. Isu, J. Inoue, K. Akahane, H. Sotobayashi, and M. Tsuchiya, "Nonlinear absorption of highly stacked InAs quantum dot layers on an InP(311) substrate (invited)," Proc. SPIE, vol. 6393, pp. 639309-1-9, 2006.
H. Sotobayashi, "Supercontinuum generation based lightwave management applied to multiplexing format conversion," Proc. SPIE, vol. 6187, 61870L-1-8, 2006.
J. T. Gopinath, H. M. Shen, H. Sotobayashi, E. P. Ippen, T. Hasegawa, T. Nagashima, and N. Sugimoto, " Highly nonlinear bismuth-oxide fiber for supercontinuum generation and femtosecond pulse compression," IEEE/OSA J. Lightwave Technol., vol. 23, no. 11, pp. 3591-3596, 2005.
P. T. Rakich, H. Sotobayashi, J. T. Gopinath, J. W. Sickler, C. W. Wong, S. G. Johnson, M. Qi, E. Lidorikis, H. I. Smith, J. D. Joannopoulos, and E. P. Ippen, "Broadband optical studies of 1-D and 3-D photonic crystals (invited)," Proc. SPIE Int. Soc. Opt. Eng., vol. 6017, pp. 6011702 1-6, 2005.
H. Sotobayashi, J. T. Gopinath, H. M. Shen, J. W. Sickler, P. T. Rakich, and E. P. Ippen, "Supercontinuum generation and Broadband fiber lasers using bismuth-oxide-based erbium-doped fiber amplifiers (invited)," Proc. SPIE Int. Soc. Opt. Eng., vol. 6014, pp. 60140T 1-8, 2005.
Y. Awaji, H. Sotobayashi, and F. Kubota, "Transmission of 80 gb/s * 6 WDM over 100 km using linear optical amplifiers," IEEE Photon. Technol. lett., vol.17, no. 3, pp. 699-701, 2005.
P. T. Rakich, H. Sotobayashi, J. T. Gopinath, S. G. Johnson, J. W. Sickler, C. W. Wong, J. D. Joannopoulos, and E. P. Ippen, "Nano-scale photonic crystal microcavity characterization with an all-fiber based 1.2-2.0 μm supercontinuum," OSA Optics Express, vol. 13, no. 3, pp. 821-825, 2005.
http://www.opticsexpress.org/abstract.cfm?URI=OPEX-13-3-821
J. T. Gopinath, H. M. Shen, H. Sotobayashi, E. P. Ippen, T. Hasegawa, T. Nagashima, and N. Sugimoto, "Highly nonlinear bismuth-oxide fiber for smooth supercontinuum generation at 1.5 μm," OSA Optics Express, vol. 12, no. 23, pp. 5697-5702, 2004. http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-23-5697
Y. Takushima, H. Sotobayashi, M. E. Grein, E. P. Ippen, and H. A. Haus, "Linewidth of mode combs of passively and actively mode-locked semiconductor laser diodes (invited)," Proc. SPIE Int. Soc. Opt. Eng., vol. 5595, pp. 213-227, 2004.
H. Sotobayashi, J. T. Gopinath, J. W. Sickler, and E. P. Ippen, "Broadband fiber lasers using bismuth-oxide-based erbium-doped fiber amplifiers (invited)," Proc. SPIE Int. Soc. Opt. Eng., vol. 5595, pp. 16-25, 2004.
H. Sotobayashi, J. T. Gopinath, E. M. Koontz, L. A. Kolodziejski and E. P. Ippen, "Wavelength tunable passively mode-locked bismuth oxide-based erbium-doped fiber laser," Optics Communications, vol. 237, no. 4-6, pp. 399-403, 2004. [Full Text(214kB, PDF)]
H. Sotobayashi, J. T. Gopinath, Y. Takushima, K. Hsu, and E. P. Ippen, "Broadband wavelength tunable, single frequency, and single polarization Bismuth Oxide-based Erbium-doped fiber laser," IEEE Photon. Technol. Lett., vol. 16, no. 7, pp. 1628-1630, 2004. [Full Text(94kB, PDF)]
H. Sotobayashi, W. Chujo, and K. Kitayama, "Highly spectral efficient optical code division multiplexing transmission system (invited)," IEEE J. S.T. Quant. Electron., vol. 10, no. 2, pp. 250-258, 2004. [Full Text(753kB, PDF)]
H. Sotobayashi, W. Chujo, and T. Ozeki, "Ultrafast OTDM/WDM networks by use of photonic processing (invited)," Proc. SPIE Int. Soc. Opt. Eng., vol. 5581, pp. 556-563, 2004.
H. Sotobayashi, "Optical code-division multiplexing and its application to ultrafast photonic networks (invited)," Proc. SPIE Int. Soc. Opt. Eng., vol. 5581, pp. 26-39, 2004.
H. Sotobayashi, J. T. Gopinath, and E. P. Ippen, "Broadband bismuth-oxide-based erbium-doped fiber lasers (invited)," Proc. SPIE Int. Soc. Opt. Eng., vol. 5460, pp. 1-9, 2004.
H. Sotobayashi, "Optical code division multiplexing (OCDM)-based ultrafast photonic network (invited)," Proc. SPIE Int. Soc. Opt. Eng., vol. 5445, 20-25, 2004.
Y. Koyamada, S. Sato, S. Nakamura, H. Sotobayashi, and W. Chujo, "Simulating and designing Brillouin gain spectrum in single-mode fibers," IEEE/OSA J. Lightwave Technol., vol. 22, no. 2, pp. 631-639, 2004.[Full Text(635kB, PDF)]
H. Sotobayashi, W. Chujo, and T. Ozeki, "Ultrafast Hierarchical OTDM/WDM Network (invited)," J. Sys. Cyb. Inf., vol. 1, no. 6, 2004. http://www.iiisci.org/Journal/SCI/Abstract.asp?var=&id=P151639
H. Sotobayashi, J.T. Gopinath, and E. P. Ippen, "23 cm long Bi₂O₃-based EDFA for picosecond pulse amplification with 80 nm gain bandwidth," IEE Electron. Lett., vol. 39, no. 19, pp. 1374-1375, 2003. [Full Text(195kB, PDF)]
J.T. Gopinath, H. Sotobayashi, and E. P. Ippen, "Broadband amplification of picosecond pulses in a 23 cm long of Bi₂O₃-based Erbium-doped fiber," OSA Trends in Optics and Photonics Series (TOPS), vol. 92, pp. 50-53, 2003.
J. Inoue, H. Sotobayashi, W. Chujo, and H. Kawaguchi, "80 Gbit/s Conventional and Carrier-Suppressed RZ Signals Transmission over 200 km Standard Fiber by Using Mid-Span Optical Phase Conjugation (invited, OECC Awarded)," IEICE Trans. on Comm., vol. E86-B, no.5, pp.1555-1561, 2003.[Full Text(817kB, PDF)]
H. Sotobayashi, "Ultra-fast photonic networks based on optical division multiplexing (invited)," Radio Science Bulletin, no. 304, pp. 34-47, 2003. [Full Text(817kB, PDF)]
H. Sotobayashi, W. Chujo, and K. Kitayama, "Optical Code Division Multiplexing (OCDM) and Its Application for Peta-bit/s Photonic Network (invited)," Information Sciences, vol. 149, pp. 171-182, 2003. [Full Text(1237kB, PDF)]
H. Sotobayashi, W. Chujo, and T. Ozeki, "Ultrafast photonic technologies for the hierarchical hybrid OTDM/WDM photonic networks (invited)," Proc. SPIE Int. Soc. Opt. Eng., vol. 5246, pp. 355-361, 2003.
H. Sotobayashi, "Improving Spectral Efficiency Based on Optical Code Division Multiplexing Techniques," OSA Optics & Photonics News, vol. 13, no. 12, p.37, 2002. [Full Text(122kB, PDF)]
H. Sotobayashi, W. Chujo, and K. Kitayama, "Photonic gateway: multiplexing format conversions of OCDM-to-WDM and WDM-to-OCDM at 40 Gbit/s (4 x 10 Gbit/s)," IEEE/OSA J. Lightwave Technol., vol. 20, no. 12, pp. 2002-2008, 2002.[Full Text(684kB, PDF)]
T. Miyazaki, H. Sotobayashi, and W. Chujo, "Synchronous optical demultiplexing and sampling of 80-Gb/s OTDM signals by optically recovered clock using mode-locked laser diode and symmetric mach--zehnder switch," IEEE Photon. Technol. Lett., vol. 14, no. 12, pp. 1734-1736, 2002[Full Text(546kB, PDF)]
H. Sotobayashi, A. Konishi, W. Chujo, and T. Ozeki, "Wavelength-band generation and transmission of 3.24-Tbit/s (81-channel WDM40-Gbit/s) carrier-suppressed return-to-zero format by use of a single supercontinuum source for frequency standardization," OSA J. Opt. Soc. Am. B, vol. 19, no. 11, pp. 2803-2809, 2002.[Full Text(1056kB, PDF)]
H. Sotobayashi, K. Kitayama, and W. Chujo, "Photonic gateway: TDM-to-WDM-to-TDM conversion and reconversion at 40 Gbit/s (4 channels 10 Gbits/s )," OSA J. Opt. Soc. Am. B, vol. 19, no. 11, pp. 2810-2816, 2002. [Full Text(1310kB, PDF)]
H. Sotobayashi, W. Chujo, and T. Ozeki, "Hierarchical hybrid OTDM/WDM network based on fast optical signal processing," IEEE LEOS News Letter, vol. 16, no. 5, 2002. [Full Text(764kB, PDF)]
H. Sotobayashi, "OCDM techniques for improved spectral densities," OSA Trends in Optics and Photonics Series (TOPS), vol. 77, pp. 278-283, 2002.
T. Makino, H. Sotobayashi, and W. Chujo, "1.5 Tbit/s (75 x 20 Gbit/s) DWDM transmission using Er³⁺-doped tellurite fiber amplifiers with 63 nm continuous signal band," IEE Electron. Lett., vol. 27, no. 17, pp. 1555-1557, 2002. [Full Text(353kB, PDF)]
J. Inoue, H. Sotobayashi, and W. Chujo, "Sub-picosecond transform-limited 160 Gbit/s optical pulse compression using supercontinuum generation," IEICE Trans. Electron., vol. E85-C, no. 9, pp. 1718-1719, 2002.[Full Text(96kB, PDF)]
H. Sotobayashi, C. Sawaguchi, Y. Koyamada, and W. Chujo, "Ultrafast walk-off free nonlinear optical loop mirror by a simplified configuration for 320 Gbit/s TDM signal demultiplexing," OSA Opt. Lett., vol. 27, no. 17, pp. 1555-1557, 2002. [Full Text(78kB, PDF)]
J. Inoue, H. Sotobayashi, W. Chujo, and H. Kawaguchi, "80 Gbit/s OTDM signal transmission over 208 km standard fibre using midspan optical phase conjugation based on four-wave mixing in semiconductor optical amplifiers," IEE Electron. Lett. vol. 38, no. 15, pp. 819-821, 2002.[Full Text(336kB, PDF)]
H. Sotobayashi, W. Chujo, and K. Kitayama, "Transparent virtual optical code/wavelength path network," IEEE Journal of Selected Topics in Quantum Electronics, vol. 8, no. 3, pp. 699-704, 2002. [Full Text(262kB, PDF)]
H. Sotobayashi, W. Chujo and K. Kitayama, "1.6-b/s/Hz 6.4-Tb/s QPSK-OCDM/WDM (4 OCDM x 40 WDM x 40 Gb/s) transmission experiment using optical hard thresholding," IEEE Photon. Technol. Lett., vol. 14, no.4, pp. 555-557, 2002.[Full Text(236kB, PDF)]
H. Sotobayashi, C. Sawaguchi, Y. Koyamada, and W. Chujo, "Walk-off free ultrafast nonlinear optical loop mirror composed of a highly-nonlinear dispersion-shifted fiber for demultiplexing 320 Gbit/s TDM signals," OSA Trends in Optics and Photonics Series (TOPS), volume on Optical Amplifiers and their Applications 2001, vol. 60, 2001.
K. Onohara, H. Sotobayashi, K. Kitayama, and W. Chujo, "Photonic time-slot and wavelength-grid interchange for 10-Gb/s packet switching," IEEE Photon. Technol. Lett., vol. 13, no. 10, pp.1121-1123, 2001. [Full Text(83kB, PDF)]
H. Sotobayashi,W. Chujo, and T. Ozeki, "Wideband tunable wavelength conversion of 10 Gbit/s RZ signals by optical time-gating of highly chirped rectangular shape supercontinuum light source," OSA Opt. Lett., vol. 26, no. 17, pp. 1314-1316, 2001.[Full Text(84kB, PDF)]
H. Sotobayashi, W. Chujo, and K. Kitayama, "1.52 Tbit/s OCDM/WDM (4 OCDM x 19 WDM x 20 Gbit/s) transmission experiment," IEE Electron. Lett., vol. 37, no. 11, pp. 700-701, 2001.[Full Text(324kB, PDF)]
H. Sotobayashi, W. Chujo, and T. Ozeki, "80 Gbit/s simultaneous photonic demultiplexing based on OTDM-to-WDM conversion by four-wave mixing with a supercontinuum light source," IEE Electron. Lett., vol. 37, no. 10, pp. 640-642, 2001.[Full Text(424kB, PDF)]
H. Sotobayashi, K. Kitayama, and W. Chujo, "40 Gbit/s photonic packet compression and decompression by supercontinuum generation," IEE Electron. Lett., vol. 37, no. 2, pp. 110-111, 2001.[Full Text(265kB, PDF)]
K. Kitayama, N. Wada and H. Sotobayashi, "Architectural considerations for photonic IP router based upon optical code correlation," IEEE/OSA J. Lightwave Technol., vol. 18, no. 12, pp. 1834-1844, 2000. [Full Text(367kB, PDF)]
H. Sotobayashi and K. Kitayama, "Optical code based label swapping for photonic routing,"IEICE Trans. Commun., pp. 2341-2347, vol. E83-B, no. 10, 2000, [Full Text(734kB, PDF)]
H. Sotobayashi, K. Kitayama.and W. Chujo, "Photonic compression and decompression of 40 Gbit/s packet by supercontinuum generation, " OSA Trends in Optics and Photonics Series (TOPS), volume on Optical Amplifiers and their Applications 2000, vol. 44, 2000.
T. Hashimoto, H. Sotobayashi, K. Kitayama and W. Chujo, "Photonic conversion of OC-192 OTDM to-4xOC-48 WDM by supercontinuum generation," IEE Electron. Lett., vol. 36, no. 13, pp. 1133-1135, 2000.[Full Text(198kB, PDF)]
N. Wada, H. Sotobayashi, and K. Kitayama, "2.5Gbit/s time-spread/wavelength-hop optical code division multiplexing using fibre bragg grating with supercontinuum light source," IEE Electron. Lett., vol. 36, no. 9, pp. 815-817, 2000.[Full Text(342kB, PDF)]
K. Kitayama, H. Sotobayashi and N. Wada, "Optical code division multiplexing (OCDM) and its application to photonic networks," IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E82-A, no. 12, pp. 2616-2626, 1999. [Full Text(1001kB, PDF)]
H. Sotobayashi and K. Kitayama, "Cancellation of the signal fading for 60 GHz subcarrier multiplexed optical DSB signal transmission in non-dispersion-shifted fiber using midway optical phase conjugation," IEEE/OSA J. Lightwave Technol., vol. 17, no. 12, pp. 2488-2497, 1999. [Full Text(200kB, PDF)]
H. Sotobayashi and K. Kitayama, "Observation of phase conservation in multi-wavelength BPSK pulse sequence generation at 10 Gbit/s using spectrum-sliced supercontinuum in an optical fiber," OSA Optics Letters., vol. 24, no. 24, pp. 1820-1822, 1999.[Full Text(96kB, PDF)]
H. Sotobayashi and K. Kitayama, "All-optical code and wavelength conversion of 10 Gb/s BPSK codes by four-wave mixing in semiconductor optical amplifier for optical code division multiplexing," OSA Trends in Optics and Photonics Series (TOPS), volume on Optical Amplifiers and their Applications '99, vol. 30, pp. 271-274, 1999.
H. Sotobayashi and K. Kitayama, "10 Gb/s OCDM/WDM multiple access using spectrum-sliced supercontinuum BPSK pulse code sequences," OSA Trends in Optics and Photonics Series (TOPS), volume on Optical Amplifiers and their Applications '99, vol. 30, pp. 258-261, 1999.
H. Sotobayashi and K. Kitayama, "Broadcast-and-select OCDM/WDM network by using 10Gbit/s spectrum-sliced supercontinuum BPSK pulse code sequences," IEE Electron. Lett., vol. 35, no. 22, pp. 1966-1967, 1999.[Full Text(225kB, PDF)]
A. Franzen, H. Sotobayashi, K. Kitayama, and I. Andonovic, "Demonstration of a high resolution synchroniser to facilitate payload recovery at an optical node," IEEE Photon. Technol. Lett., 1999. [Full Text(92kB, PDF)]
H. Sotobayashi and K. Kitayama, "All-optical simultaneous code and wavelength conversion of 10 Gb/s BPSK codes by four-wave mixing in a semiconductor optical amplifier for optical code division multiplexings," IEE Electron. Lett., vol. 35, no. 13, pp. 1091-1093, 1999.[Full Text(336kB, PDF)]
H. Sotobayashi and K. Kitayama, "Effects of asymmetric power change on BER performance using midway optical phase conjugation for fading cancellation in 60 GHz millimeter-wave optical DSB signal transmission over 100 km non-dispersion-shifted fiber," IEE Electron. Lett., vol. 35, no. 12, pp. 992-993, 1999.[Full Text(243kB, PDF)]
H. Sotobayashi and K. Kitayama, "1.24 Gb/s, optical code division multiplexing transmission over 40 km dispersion-shifted fiber by bipolar coding using broadband incoherent light source," IEE Electron. Lett., vol. 35, no. 11, pp. 911-913, 1999.[Full Text(330kB, PDF)]
N. Wada, H. Sotobayashi, and K. Kitayama, "Error-free 100 km transmission of 10 Gbit/s optical code division multiplexing using BPSK picoseconds-pulse code sequence with novel time-gating detection," IEE Electron. Lett., vol. 35, no. 10, pp. 833-834, 1999.[Full Text(211kB, PDF)]
H.Sotobayashi and K. Kitayama, "Transfer response measurements of a programmable bipolar optical transversal filter by using the ASE noise of an EDFA," IEEE Photon. Technol. Lett., vol. 11, no. 7, pp.871-873, 1999. [Full Text(60kB, PDF)]
H.Sotobayashi and K. Kitayama, "Observation of phase conservation in a pulse sequence at 10 Gbit/s in a semiconductor optical amplifier wavelength convertor by four-wave mixing," IEEE Photon. Technol. Lett., vol. 11, no. 1, pp.45-47, 1999. [Full Text(57kB, PDF)]
H. Sotobayashi and K. Kitayama, "325 nm bandwidth supercontinuum generation at 10 Gbit/s using dispersion-flattened and non-decreasing normal dispersion fibre with pulse compression technique," IEE Electron. Lett., vol. 34, no. 13, pp.1336-1337, 1998.[Full Text(2114kB, PDF)]
I. Andonovic, H. Sotobayashi, N. Wada, and K. Kitayama, "Experimental demonstration of the (de)coding of hybrid phase and frequency codes using a pseudolocal oscillator for optical code division multiplexing," IEEE Photonics Technology Letters, vol. 10, no. 6, pp.887-890, 1998. [Full Text(60kB, PDF)]
H. Sotobayashi and K. Kikuchi, "Design theory of ultra-short pulse generation from actively mode-locked fiber lasers," IEICE Transactions on Electronics, vol. E91-C, no. 2, pp.201-207, 1998. [Full Text(558kB, PDF)]

International Conferences

G. Qin, H. Sotobayashi, M. Tsuchiya, A. Mori, T. Suzuki, Y. Ohishi, "Highly Efficient Brillouin Slow Light Generation Using a Single Mode Tellurite Fiber," Conference on Lasers and Electro-Optics Quantum Electronics and Laser Science Conference (CLEO/QELS 2008), CTuB6, San Jose, May 2008.
N. Yamamoto, H. Sotobayashi, K. Akahane, M. Tsuchiya, K. Takashima, H. Yokoyama, "1-μm Waveband 10-Gbit/s Transmission over a 7-km Single-Mode Hole Assisted Fiber Using a Harmonically Mode-Locked Semiconductor Laser," Conference on Lasers and Electro-Optics Quantum Electronics and Laser Science Conference (CLEO/QELS 2008), CTuLL4, San Jose, May 2008.
I. Morohashi, T. Sakamoto, H. Sotobayshi, I. Hosako, T. Kawanishi, and M. Tsuchiya, "10 GHz 200 fs pulse generation from Mach-Zehnder-modulator- based optical frequency comb generator," the 2008 Optical Fiber Communication Conference (OFC2008), San Diego, USA, 28 Feb., 2008.
H. Sotobayashi, "Ultrafast photonic processing and its applications to ultra-wideband photonic networks (invited)," Asia Pacific Laser Symposium (APLS 2008, Nagoya, January, 2008.
H. Sotobayashi, N. Yamamoto, K. Akahane, M. Tsuchiya, "All-band photonic transport system and its enabling technologies (invited)," International Conference on Communications Systems and Technologies (ICCST 2007), San Francisco, October 2007.
H. Sotobayashi, N. Yamamoto, K. Akahane, M. Tsuchiya, K. Takashima, H. Yokoyama, "Development of a 1030-nm mode-locked semiconductor laser and its applications (invited)," SPIE Optics East 2007, Boston, September 2007.
G. Qin, Y. Ohishi, H. Sotobayashi, M. Tsuchiya, A. Mori, "Stimulated Brillouin amplification in a tellurite fiber as a potential system for slow light generation," European Conference and Exhibition on Optical Communication (ECOC2007), paper 2.4.4, Berlin, September 2007.
K. Akahane, N. Yamamoto, S. Gozu, A. Ueta, H. Sotobayashi, and M. Tsuchiya, ""High bandwidth semiconductor gain material for photonic active devices with a stacked quantum dots structure grown by strain-compensation technique," the 12th Optoelectronics and Communications Conference (OECC 2007), Yokohama, July 2007.
H. Sotobayashi, "Ultrawideband 40GHz optical comb generation and its distribution through WDM optical fiber networks," European Frequency and Time Forum (EFTF2007), paper C1LB2, May 2007.
H. Sotobayashi, "Ultrafast optical code division multiplexing and its enabling components (TUTORIAL presentation" SPIE Optics East, paper 6089-22, Boston, October 2006.
T. Isu, J. Inoue, K. Akahane, H. Sotobayashi, M. Tsuchiya, "Nonlinear absorption of highly stacked InAs quantum dot layers on an InP(311) substrate (Invited)," SPIE Optics East, paper 6093-09, Boston, October 2006.
H. Sotobayashi, "Code-division Multiplexing Technique Applied to Photonic Networks (PLENARY presentation)," IASTED International Conference Communication Systems and Networks (CSN 2006), Palma de Mallorca, August 2006.
H.Sotobayashi, "Supercontinuum generation based photonic processing applied to multiplexing format conversions (Invited)," the 11th European Conference on Networks & Optical Communications (NOC 2006), Berlin, July 2006.
P.T. Rakich, H. Sotobayashi, J.T. Gopinath, J. W. Sickler, C. W. Wong, M. Qi, S. G. Johnson, E. Lidorikis, J. D. Joannopoulos, H. I. Smith ,and E. P. Ippen, "Broadband Optical Studies of Nano-Scale 1-D and 3-D Photonic Crystals,”2006 Asia-Pacific Microwave Photonics Conference (AP-MWP2006), paper J1, Kobe, April 2006.
H. Sotobayashi, "Supercontinuum generation based lightwave management applied to multiplexing format conversion," SPIE Photonics Europe, paper 6187-21, Strasbourg, April 2006.
H. Sotobayashi, J. T. Gopinath, H. M. Shen, J. W. Sickler, P. T. Rakich, and E. P. Ippen, "Supercontinuum generation and its applications (invited paper)," SPIE Optics East, paper 6014-30, Boston, October 2005.
P.T. Rakich, H.Sotobayashi, J.T. Gopinath, J. W. Sickler, C. W. Wong, M. Qi, S. G. Johnson, E. Lidorikis, J. D. Joannopoulos, H. I. Smith ,and E. P. Ippen, "Broadband studies of 1D and 3D photonic crystals (invited paper)," SPIE Optics East, paper 6017-02, Boston, October 2005.
P.T. Rakich, H.Sotobayashi, J.T. Gopinath, J. W. Sickler, C. W. Wong, M. Qi, S. G. Johnson, E. Lidorikis, J. D. Joannopoulos, H. I. Smith ,and E. P. Ippen, "Broadband optical studies of 1D and 3D photonic crystals (invited)," the 10th European Conference on Networks & Optical Communications (NOC 2005), London, July 2005.
K. Kitayama, X. Wang, H. Sotobayashi, "Gigabit-symmetric FTTH -OCDMA over WDM PON-," 9th Conference on Optical Network Design and Modelling(ONDM 2005), no. 8.3., pp. 273-281, Milan, February 2005.
P. T. Rakich, J. T. Gopinath, H. Sotobayashi, C. W. Wong, S. G. Johnson, J. D. Joannopoulos, and E. P. Ippen, "Broadband Supercontinuum based Measurements of High-Index Contrast Photonic Bandgap Devices from 1 to 2 μm," IEEE LEOS annual meeting 2004, paper ThI3, Puerto Rico, November 2004.
J. T. Gopinath, H. M. Shen, H. Sotobayashi and E. P. Ippen, "Novel Highly Nonlinear Bismuth Oxide Fiber for Supercontinuum Generation," IEEE LEOS annual meeting 2004, paper WD2, Puerto Rico, November 2004.
H. Sotobayashi, J. T. Gopinath, J. W. Sickler, and E. P. Ippen, "Broadband fiber lasers using Bismuth Oxide-based Erbium-doped fiber amplifiers (invited)" SPIE Optics East, paper 5595-03, Philadelphia, October 2004.
Y. Takushima, H. Sotobayashi, M. E. Grein, E. P. Ippen, and H. A. Haus, "Linewidth of mode combs of passively and actively mode-locked semiconductor laser diodes (invited)," SPIE Optics East, paper 5595-31, Philadelphia, October 2004.
K. Kitayama, X. Wang, H. Sotobayashi, "State of the Art of OCDMA, OCDM, and OC-label Switchings (invited)," 30th European Conference on Optical Communication(ECOC2004), Stockholm, no. Tu4.6.1, pp.266-269, September 2004.
H. Sotobayashi, J. T. Gopinath, J. W. Sickler, and E. P. Ippen, "Novel fiber laser technologies using broadband Bismuth Oxide-based Erbium-doped fiber amplifiers (invited)" the 9th European Conference on Networks & Optical Communications (NOC 2004), paper no.5, Eindhoven, June 2004.
J. W. Sickler, J. T. Gopinath, S. N. Tandon, H. Sotobayashi, G. S. Petrich, L. A. Kolodziejski, and E. P. Ippen, "Femtosecond laser using broadband erbium-doped bismuth oxide gain fiber," Conference on Lasers and Electro-Optics Quantum Electronics and Laser Science Conference (CLEO/QELS 2004), CThK6, San Francisco, May 2004.
Y. Awaji, H. Sotobayashi, and F. Kubota, "4 x 160 Gbit/s WDM transmission by a cascade of semiconductor LOAs," Conference on Lasers and Electro-Optics Quantum Electronics and Laser Science Conference (CLEO/QELS 2004), CThQ2, San Francisco, May 2004.
H. Sotobayashi, J.T. Gopinath, and E.P. Ippen, "Broadband bismuth oxide-based erbium-doped fiber lasers (Invited)," SPIE Photonics Europe 2004, paper 5460-01, Strasbourg, April 2004.
H. Sotobayashi, J.T. Gopinath, Y. Takushima, E.P. Ippen, and K. Hsu, "90 nm wavelength tunable single frequency Bi₂O₃-based Erbium-doped fiber lasers," IEEE LEOS annual meeting 2003, paper ThD3, Tucson, October 2003.
Y. Awaji, H. Sotobayashi, and F. Kubota, "80 Gbit/s x 6WDM Transmission Experiment over 100 km by using Cascaded LOAs as Repeaters," IEEE LEOS annual meeting 2003, paper WY4, Tucson, October 2003.
H. Sotobayashi, J.T. Gopinath, and E.P. Ippen, "Bi₂O₃-Based Erbium-Doped Fibers for Broadband Photonic Network Applications (Invited)," The 2nd Symposium on Photonics, Networking and computing (PNC 2003), PNC-2, Cary, September 2003.
H. Sotobayashi, J.T. Gopinath, E.M. Koontz, L.A. Kolodziejski, and E.P. Ippen, "Passively mode-locked Bi₂O₃-based Erbium-doped fiber laser with a 30 nm wavelength tunability in the L-band," The 29th European Conference on Optical Communication (ECOC 2003), We2.6.2., Rimini, September 2003.
H. Sotobayashi, "Ultrafast optical code division multiplexing and its applications to ultrafast photonic networks (Plenary)," The 7th conference on optics (ROMOPTO 2003), PI4, Constanta, September 2003.
H. Sotobayashi, W. Chujo, and T. Ozeki, "Ultrafast OTDM/WDM networks by use of photonic processing (Invited)," The 7th conference on optics (ROMOPTO 2003), Constanta, III.I.6, September 2003.
H. Sotobayashi, W. Chujo, and T. Ozeki, "Ultrafast photonic technologies for the hierarchical hybrid OTDM/WDM photonic networks (Invited)," paper 5246-43, Information Technologies and Communications (ITCom 2003), Orlando, September 2003.
H. Sotobayashi, "Optical code division multiplexing based ultrafast photonic netowk (Invited)," 9th International Symposium on Microwave and Optical Technology (ISMOT 2003), paper 156, Ostrava, August 2003.
H. Sotobayashi, W. Chujo, and T. Ozeki, "Ultrafast Hierarchical Hybrid OTDM/WDM Network," The 7th World Multiconference on Systemics, Cybernetics and Informatics (SCI2003), vol. X, pp. 72-75, Orlando, July 2003.
J. Gopinath, H. Sotobayashi, and E. Ippen, "Picosecond pulse amplification over a bandwidth of 80 nm in a 23 cm length of Bi₂O₃-based Erbium-doped fiber," OSA Optical Amplifiers and Their Applications (OAA 2003), paper MD23, Otaru, July 2003.
H. Sotobayashi, "Novel ASE Noise Reduction by using Optical Time-gating Technique in Optically Preamplified Direct-detection Systems," Wireless and Optical Communications (WOC 2003), paper 383-155, Banff, July 2003.
H. Sotobayashi, W. Chujo, and T. Ozeki, "Ultrafast photonic processing and its application to ultra-wideband OTDM/WDM networks (Invited)," 8th European Conference on Networks & Optical Communications (NOC 2003), pp. 75-82, Vienna, July 2003.
Y. Awaji, J. Inoue, H. Sotobayashi, F. Kubota, and T. Ozeki, "Nonlinear inter-channel cross talk of linear optical amplifier (LOA) in DWDM applications," Optical Fiber Communication Conference (OFC 2003), ThC4, Atlanta, March 2003.
H. Sotobayashi, "Ultra-broadband photonic networks based on optical code division multiplexing," IASTED International Conference Communications, Internet and Information Technology (CIIT 2002), 376-140, St. Thomas, November 2002.
H. Sotobayashi, "OCDM techniques for improved spectral efficiency (Invited),"IEEE LEOS annual meeting (LEOS 2002), ThY1, Glasgow, November 2002.
J. Inoue, H. Sotobayashi, W. Chujo, and H. Kawaguchi, "An 80 Gbit/s RZ and carrier-suppressed-RZ signal transmission over 200-km standard single-mode fiber by using mid-span optical phase conjugation based on four-wave mixing in semiconductor optical amplifiers," IASTED International Conference on Communications and Computer Networks (CCN 2002), 381-069, Cambridge, November 2002.
H. Sotobayashi, W. Chujo, and K. Kitayama, "Photonic gateways: 40 Gbit/s bi-lateral multiplexing format conversions of OTDM-WDM-OTDM and OCDM-WDM-OCDM," IASTED International Conference on Communications and Computer Networks (CCN 2002), 381-059, Cambridge, November 2002.
H. Sotobayashi, W. Chujo, and T. Ozeki, "Hierarchical hybrid OTDM/WDM network based on ultrafast photonic processing," IASTED International Conference Communication Systems and Networks (CSN 2002), 371-105, Malaga, September 2002.
H. Toda, M. Suzuki, R. Takami, H. Sotobayashi, T. Miyazaki, T. Makino, J. Inoue, and W. Chujo, "1.5 Tbit/s (75 x 20 Gbit/s) DWDM transmission using Er3+-doped Tellurite fiber amplifiers and a single OTDM demultiplexing scheme," 28th European Conference on Optical Communication (ECOC 2002), paper 3.1.6, Copenhagen, September 2002.
T. Miyazaki, H. Sotobayashi, and W. Chujo, "Optical sampling and demultiplexing of 80 Gb/s OTDM signals with optically recovered clock by injection mode-locked laser diode," 28th European Conference on Optical Communication (ECOC 2002), paper 2.1.6, Copenhagen, September 2002.
H. Sotobayashi, "Ultra-fast photonic networks based on optical code division multiplexing (Tutorial)," XXVIIth URSI General Assembly, The Commission D Tutorial, DT, Maastricht, August 2002.
H. Sotobayashi, W. Chujo, and T. Ozeki, "Hierarchical Hybrid OTDM/WDM Network (Invited)," IEEE LEOS Summer Topicals 2002, WF3, Quebec, July 2002.
H. Sotobayashi, "OCDM techniques for improved spectral efficiency (Invited),"Optical Amplifiers and their Applications (OAA 2002), OTuB1, Vancouver, July 2002.
T. Makino, H. Sotobayashi, and W. Chujo, "1.5Tbit/s (75 x 20 Gbit/s) DWDM transmission with a 63nm continuous bandwidth ssing Er-doped Tellurite fiber amplifiers," 7th OptoElectronics and Communications Conference (OECC2002), 10B3-4, Yokohama, July 2002.
J. Inoue, H. Sotobayashi, W. Chujo, and H. Kawaguchi, "80-Gbit/s carrier-suppressed RZ signal transmission over 208-km standard fiber using an optical phase conjugation," 7th OptoElectronics and Communications Conference (OECC2002), 9B1-3, Yokohama, July 2002.
J. Inoue, H. Sotobayashi, and W. Chujo, "Picosecond 80-Gbit/s OTDM signal transmission over 208-km standard fiber using midspan optical phase conjugation," Conference on Lasers and Electro-Optics Quantum Electronics and Laser Science Conference (CLEO/QELS 2002), CThN3, pp. 496, Long Beach, May 2002.
H. Sotobayashi, W. Chujo, and K. Kitayama, "Photonic gateway for bi-directional OCDM - WDM conversions at 40 Gbit/s (4 x 10 Gbit/s)," Optical Fiber Communication Conference (OFC 2002), ThEE2, Anaheim, March 2002.
H. Sotobayashi, W. Chujo, and T. Ozeki, "Inter-wavelength-band conversions and demultiplexings of 640 Gbit/s OTDM signals," Optical Fiber Communication Conference (OFC 2002), WM2, Anaheim, March 2002.
H. Sotobayashi, W. Chujo, and K. Kitayama, "Optical Code Division Multiplexing (OCDM) and Its Application for Peta-bit/s Photonic Network (Invited)," 1 st Symposium on Photonics, Networking and Computing (PNC 2002), pp. 1371-1374, Durham, March 2002.
H. Sotobayashi, W. Chujo, and K. Kitayama, "1.6 bit/s/Hz, 6.4 Tbit/s OCDM/WDM (4OCDMx 40WDMx 40Gbit/s) transmission experiment," 27th European Conference on Optical Communication (ECOC 2001), PD.M.1.3, vol. 6, pp. 6-7, Amsterdam, October 2001.
H. Sotobayashi, M. Masuda, K. Yamada, T. Kudou, W. Chujo, and T. Ozeki, "Suppression of PMD induced pulse broadening by using nonlinear evolution of polarization mode-coupling," 27th European Conference on Optical Communication (ECOC 2001), We.A.3.4, vol. 3, pp. 350-351, Amsterdam, October 2001.
H. Sotobayashi, A. Konishi, W. Chujo, and T. Ozeki, "Simultaneously generated 3.24 Tbit/s (81 WDM x 40 Gbit/s) carrier suppressed RZ transmission using a single supercontinuum source," 27th European Conference on Optical Communication (ECOC 2001), Mo.F.3.3, vol. 1, pp. 56-57, Amsterdam, October 2001.
H. Sotobayashi, C. Sawaguchi, Y. Koyamada, and W. Chujo, "Walk-off free ultrafast nonlinear optical loop mirror composed of a highly-nonlinear dispersion-shifted fiber for demultiplexing 320 Gbit/s TDM signals," Optical Amplifiers and their Applications (OAA 2001), OTuA6, pp. OtuA6-1-OTuA6-3, Stresa, July 2001.
K. Yamada, M. Masuda,T. Kudou, T. Ozeki, H. Sotobayashi, and W. Chujo, "Broadband simultaneous adaptive PMD equalization in 9 x 40 Gbit/s WDM transport networks," Optoelectronics and Communications Conference (OECC/IOOC 2001), PO.1.13, pp. 367-368, Sydney, July 2001.
H. Sotobayashi, W. Chujo, and K. Kitayama, "1.52 Tbit/s OCDM/WDM (4 OCDM x 19 WDM x 20 Gbit/s) transmission experiment based on simultaneous optical encoding of a single supercontinuum source," 6 th European Conference on Networks & Optical Communications (NOC2001), pp. 442-447, Ipswich, July 2001.
J. Inoue, H. Sotobayashi, and W. Chujo, "160 Gbit/s, 600 fs signal generation by chirping compensation of directly pumped supercontinuum source," The 8th International Workshop on Femtosecond Technology (FST2001), FC-5, p. 155, Tsukuba, June 2001.
H. Sotobayashi, W. Chujo, and T. Ozeki, "Wideband and tunable wavelength conversion of 10 Gbit/s RZ data sequences based on optical time-gating of supercontinuum source," Conference on Lasers and Electro-Optics Quantum Electronics and Laser Science Conference (CLEO/QELS 2001), CThB5 pp. 385-386, Baltimore, May 2001.
H. Sotobayashi, and W. Chujo, "Novel all-optical demultiplexing technique by OTDM-to-WDM conversion at 80 Gbit/s based on four-wave mixing with supercontinuum source," Nonlinear Guided Waves and Their Applications (NLGW 2001), MB3, pp. 26-28, Clearwater, March 2001.
H. Sotobayashi, W. Chujo, and T. Ozeki, "Bi-directional photonic conversion between 4x10 Gbit/s OTDM and WDM by optical time-gating wavelength interchange," Optical Fiber Communication Conference (OFC 2001), WM5, pp. WM5-1-WM5-3, Anaheim, March 2001.
H. Sotobayashi, W. Chujo, and K. Kitayama, "Demonstration of ultra-wideband and transparent virtual optical code/wavelength path network," Optical Fiber Communication Conference (OFC 2001), TuV4, pp. TuV4-1-TuV4-3, Anaheim, March 2001.
H. Sotobayashi, K. Kitayama, T. Hashimoto, and W. Chujo, "Photonic gateway (invited)," International Topical Workshop on Contemporary Photonic Technologies (CPT2001), Wc-3, pp. 151-154, Tokyo, January 2000.
K. Kitayama, H. Sotobayashi,T. Hashimoto and W. Chujo, "Photonic gateway for TDM - WDM - TDM: 40 Gbit/s (4 x 10 Gbit/s) conversion and reconversion," 26th European Conference on Optical Communication (ECOC 2000), paper 9.4.3, pp. 301-302, vol. 3, Munich, September 2000.
H. Sotobayashi, K. Kitayama.and W. Chujo, "Photonic compression and decompression of 40 Gbit/s packet by supercontinuum generation, " 11th Optical Amplifiers and their Applications (OAA 2000), OtuC, pp. 133-135, Quebec, July 2000.
H. Sotobayashi, W. Chujo and K. Kitayama, "3 x 10 Gbit/s OCDM transmission at 1550 nm band over 150 km standard fiber using midspan optical phase conjugation, " Fifth Optoelectronics and Communications Conference (OECC2000), 14A2-4, pp. 456-457, Chiba, July 2000.
H. Sotobayashi and K. Kitayama, "All-optical code conversion of 10 Gb/s BPSK codes without wavelength-shift by cross-phase modulation for optical code division multiplexing networks ," Optical Fiber Communication Conference (OFC 2000), WJ7, pp. 163-165, Baltimore, March 2000.
H. Sotobayashi and K. Kitayama, "All-optical simultaneous optical code and wavelength conversion in the OCDM/WDM network nodes by FWM in an optical fiber," International Topical Workshop on Contemporary Photonic Technologies (CPT2000), Tc-21, pp. 113-114, Tokyo, January 2000.
N. Wada, and H. Sotobayashi, "Optical code division multiplexing (OCDM) and its application to photonic networks," Photonic Network Forum (PNF'99), B1, pp. B1-1-B1-4, Tokyo, October 1999.
N. Wada, H. Sotobayashi, and K. Kitayama, "Error-free transmission of 2-channel x 2.5 Gbit/s time-spread / wavelength-hop OCDM using fiber bragg grating with supercontinuum light source," European Conference on Optical Communication (ECOC '99), Th C1.1, Nice, September 1999.
H. Sotobayashi and K. Kitayama, "10 Gb/s OCDM/WDM multiple access using spectrum-sliced supercontinuum BPSK pulse code sequences," Optical Amplifiers and their Applications (OAA '99), PD7, pp. Pdp7-1-Pdp7-3, Nara, June 1999.
H. Sotobayashi and K. Kitayama, "All-optical code and wavelength conversion of 10 Gb/s BPSK codes by four-wave mixing in semiconductor optical amplifier for optical code division multiplexing," Optical Amplifiers and their Applications (OAA '99), FA3, pp. 238-240, Nara, June 1999.
H. Sotobayashi and K. Kitayama, "1.24 Gb/s, 40 km optical code division multiplexing transmission by using spectral bipolar coding of broadband incoherent light," Optical Fiber Communication Conference (OFC '99), WE7, pp. 92-94, San Diego, February 1999.
K. Kitayama and H. Sotobayashi, "Fading-free fiber-optic transport of 60 GHz-optical DSB signal by using in-line phase conjugator," Optical Fiber Communication Conference (OFC '99), WD4, pp. 64-66, San Diego, February 1999.
K. Kitayama and H. Sotobayashi, "Optical code-wavelength conversion for hybrid OCDM/WDM networks," 24th European Conference on Optical Communication (ECOC '98), TuD11, pp. 339-340, Madrid, September 1998.
H. Sotobayashi and K. Kitayama, "Simplified approach to supercontinuum generation at 10 Gbit/s using dispersion-flattened uniform normal dispersion fiber along with pulse compression technique, " Third Optoelectronics and Communications Conference (OECC '98), 15A3-5, pp. 332-333, Chiba, July 1998.
H. Sotobayashi, I. Andonovic, N. Wada, and K. Kitayama, "Coherent en/decoding of 20-chip long hybrid BPSK and frequency varying code using time-stretched SC laser pulses for giga-bit optical code division multiplexing, " Third Optoelectronics and Communications Conference (OECC '98), 14P-13, pp. 212-213, Chiba, July 1998.

Books

H. Sotobayashi and T. Ozeki, "WDM Technologies: Optical Networks," Chapter 2 "OTDM and WDM for Large-Scale Photonic Networks," pp. 13-61, Elsevier Academic Press, Burlington, MA, U.S.A., 2004.
H. Sotobayashi, "Optical code division multiple access: fundamentals and applications," Chapter 7 "Hybrid multiplexing techniques (OCDMA/TDM/WDM)," pp. 241-271, Crc press Taylor & Francis, New York, NY, U.S.A., 2005.
"The Handbook of Computer Networks (three volume set)", John Wiley & Sons, Inc., 2007.

Awards and Honors

The Research fellow of the Japan Society for the Promotion of Science (1995-1997).
The 1999 Young Engineer Award from the Institute of Electronic and Communication Engineers of Japan.
"10 Gb/s OCDM/WDM multiple access using spectrum-sliced supercontinuum BPSK pulse code sequences"
The 2000 Novel Research Award from Research Foundation for Opto-Science and Technology.
"Excellent research activities on the next generation photonic network"
The 60th Novel Patent Award of the Ministry of Education, Culture, Sports, Science, and Technology, 2001.
"Dispersion measurement methods of the optical transport system"
The 2002 Overseas Research Fellow of the Japan Society for the Promotion of Science.
The best paper award of the OptoElectronics and Communications Conference 2002 (OECC),
J. Inoue, H. Sotobayashi, W. Chujo, and H. Kawaguchi, "80-Gbit/s carrier-suppressed RZ signal transmission over 208-km standard fiber using an optical phase conjugation," the 7th OptoElectronics and Communications Conference (OECC2002), 9B1-3, Yokohama, July 2002.
The 18th Telecom System Technology Award of the Telecommunications Advancement Foundation, 2002.
H. Sotobayashi, W. Chujo, and K. Kitayama, "Transparent virtual optical code/wavelength path network," IEEE Journal of Selected Topics in Quantum Electronics, vol. 8, no. 3, pp. 699-704, 2002.
The 44th Optics Prize for excellent papers of the Japan Society of Applied Physics, 2002.
H. Sotobayashi, W. Chujo and K. Kitayama, "1.6-b/s/Hz 6.4-Tb/s QPSK-OCDM/WDM (4 OCDM x 40 WDM x 40 Gb/s) transmission experiment using optical hard thresholding," IEE Photonics Technology Letters, vol. 14, no.4, pp. 555-557, 2002.
The best paper award of the 7th World Multiconference on Systemics, Cybernetics and Informatics (SCI2003)
H. Sotobayashi, W. Chujo, and T. Ozeki, "Ultrafast Hierarchical Hybrid OTDM/WDM Network," The 7th World Multiconference on Systemics, Cybernetics and Informatics (SCI2003), Orlando, July 2003.
The 2005 Young Scientist Award from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.
The 2006 ICO Prize from the International Commission for Optics. (appointed as the award winner)

Activities Since April, 1997 : last update: May, 2008

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