Research activities in our

Ultrafast Optical Logic Laboratory
2007-2008

Yoshiyasu Ueno, Professor
http://www.ultrafast.ee.uec.ac.jp/
http//www.ultrafast.ee.uec.ac.jp/
phone: +81-42-443-5807
email: ueno@ee.uec.ac.jp
Department of Electronic Engineering,

University
y of Electro-Communications (UEC)
Chofu city, Tokyo, Japan
This bi-annualThibil reportt can beb downloadeddl d d fromf
http://www.ultrafast.ee.uec.ac.jp/annual.pdf

1

Ultrafast Optical Logic Lab., UEC

On-going Research Project lineup
On-going Projects that we want to run in our lab.
(depending upon the quantity and quality of grad students every two-three years!!)(1) 200 Gb/s DISC gate experimenthigh speed limit, low-energy-dissipation limit
quantum electronical optical-acceleration
quantum-electronical,
optical acceleration mechanism(2) New scheme of mode-locking pulse generation
sub-picosecondphigh-qualityg qy pulsep
generation,g,
precise frequency-comb generation,
wide-gap materials(3) M
Materials
t i l nonlinear-responselicharacterizationht i tidilute quantum-dot versus bulk semiconductors, taking into account the Krammers-Kronig relation,
size reduction with pc/qd waveguides(4) Newly exploring the 200-to-500 GHz speed region
optical-spectrum-synthesis design and characterization which we have proposed (Nakamoto et al., OE 2007)
attention to: effective efficiency,
efficiency i.e.,
i e dc energy consumption
2

Ultrafast Optical Logic Lab., UEC

COE-research: DISC-type all-optical semiconductor gate

200-Gb/s
200
Gb/s, data
data-driven
driven, optically gated waveform
Sakaguchi, et al., submitted to Opt. Comm., Elsevier.
UEC---Tech. Univ. Denmark collaboration, 2004-2005.

SMZ-DISC-type gate structure (1998)
SMZ DISC方式
SMZ-DISC

λ=λ1

λ=λ2

SOA

λ=λ2

MZI, Δt

200-Gb/s, 5,000-bit-long, gated waveform, May 2008,
measured with a home-made, precisely synchronized 40-MHz monitoring system.

Custom-designed
InGaAsP semiconductor optical amp.

Distance in air
air, z (mm)-20100100010111…

1.0
0.5
0

-75

-50

-25

0

+25

Time (ps)

+50

0

+10

+20

Spectra before and after the DISC gate.

Gated waveform, 1540 nm

Wavelength (nm)100100010111…

1.0

0.5

+75

0

-75

-50

-25

0

+25

+50

+75

Time (ps)SOA’s dc-electric-power consumption= 0.59 Watt= 3.0 pJ/bit.

Relative inntensity (dB)

Input data, 1560 nm

1.5IIntensity (a. u.)

Intensity (a. u.)

1.5

-10

+10

1580

1560

1540

1520

Input

Output

0

-10

-20

190

192

194

196

Optical frequency (THz)3

Ultrafast Optical Logic Lab., UEC

COE-research: DISC-loop-type mode-locked pulse source

Single mode 2
Single-mode,
2-ps,
ps 10
10-GHzGHz pulse and comb generation
2-ps 10-GHz pulse
2-ps,pulse’ss optical waveform,
waveform and comb spectrum
Wavelength (nm)Distance in air, z (mm)SOA’s dc-electric-power consumption= 0.56 Watt

2 ps
0.5

Intensityy (dBm)high-Finesse solid etalon(FSR= 10 GHz, Δf3dB= 180 MHz,Japan Aviationi ti Electronics Industries,
I d t i
LtdLtd.))-50

0Time (ps)

+50

1552

0

+20

1.0

0
-100

0

0

+100

Inten
nsity (dBm/nm
m)commercially-available InGaAsP SOA module.

Intensity (a. u.)

1.5

-20

1550

1548

1546

-20

550 GHz
-40
-60
193.0

193.5

194.0

Optical frequency (THz)single-longitudinal
singlelongitudinal mode

-20

multi-mode(previous result)

-40
40
-60
-80
9 90
9.90
9 95
9.95
10 00 10.05
10.00
10 05 10.10
10 10
OE-converted signal frequency (GHz)4Ultrafast Optical Logic Lab., UEC

COE-research: DISC-loop-type mode-locked pulse source

22-ps,
40 GH pulse
40-GHzl andd combb generation,ti
2005 2006
2005-2006
R. Suzuki, et al., CLEO, Long Beach, USA, May 2006.

Original scheme from,Y. Ueno, et al., Appl. Phys. Lett. Oct. 2001

Optical-frequency-comb spectrum
0

25ps = 41GHz
10
1.0

13.5 dB

0.5

0.0-37.5 -25 -12.5

Inntensity (dB
Bm)

SHG Intensity (a. u.)

Auto-correlation trace

-40
-60
-80
1546 1548 1550 1552 1554

0 +12.5 +25 +37.5

Wavelength (nm)0-50 -25

0

25

Delay (ps)

50

-20
-40

(3) Gloop> 0dB

-60
-80
1553

1554

1555

1556

1557

Wavelength (nm)Intensity (dBm)0100-50 -25

0

25

Delay (ps)

-20
-40
-60
-80

50

1553

1554

1555

1556

1557

Wavelength (nm)(2) Gloop≥ 0dB
near threshold

Inteensity (dBm)0100-50 -25

0

25

Delay (ps)

50

-20
-40
-60

(1) Gloop< 0dB

-80
1553

1554

1555

1556

Wavelength (nm)1557

Proof of principle (1), threshold behavior
0

(3)

-10

(2)
-20

(1)

7.2dB

-30
-10

+0.7
0

+10

+20

Pulse loop gain, G loop [dB]

Proof of principle (2), linearly controlled pulse widths
Measureedof pulse,τ (ps))
Outpu
ut width
pulse width,τ [ps]

10

Output opttical power, Pout [dBm]20

measuredd t-ff product,d
Δ Δf 0.53
Δt⋅Δf=(1.2 times that of a Gaussian pulse)0

Intensity (dBm)

Auto-correlation Signal
Intensity ( mV )Auto-correlation Signaal
Intensity ( mV )20

Auto-corrrelation Signal
Intenssity ( mV )Delay (ps)20

330pm = 41GHz

-20

6
5
4
3
2
1
0
0

1 2 3 4 5 6
MZI'stime
delay
time, Δt (ps)
[ps]
Delay
in DISC,solid curve: 10 GHz
dashed curve: 40 GHz

5Ultrafast Optical Logic Lab., UEC

COE-research: Ultrafast optical phase/intensity-response

characterization research of PC/QD waveguides
Collaboration project between U. Tsukuba-AIST-UEC-NEC, 2005-2007.

(by Salleras and Honma)

home made pump-and-probe
home-madepump and probe, AOM
AOM-heterodyne
heterodyne, system,
systemcombined with commercial Green -- Ti:S -- Parametric Osc.
System (Spectra Phys.) in our lab.

Air-bridge (2μm)

air-bridged GaAs-photonic-crystal (PC)/ InAs quantum-dot (QD) integrated waveguides,
fabricated by U. Tsukuba and AIST.
ref.: K. Asakawa, et al., New J. Phys. 8 (2006) 208.

6

Ultrafast Optical Logic Lab., UEC

COE research, for making-up Future Vision:dc electric energy consumption model (DISC gate)dc-electric-energyt )(1/τeff)2
30
1

10

100

Bandwidth, 1/τeff (GHz)

1000

300

B#1 1100 μm
B#2 700 μm
B#3 500 μm

B#3 500 μm

A#1 1000 μm
A#2 700 μm

100
30
1

measuredPOP ~ B
10

100

2

1000

Bandwidth, B (GHz)numbers from this work (very first report, to our knowledge):• 10-20 pJ of dc energy, per one-bit all-optical signal-process• 7 × 107 electrons, per one-bit all-optical signal-process

nonlinear semiconductors
nonlinear silica fibers>100 pJ/bit

1 nanoo-e-o conversionnDemux,( Electrical)ref [9]1000

calculatedcoo - nvee-o n
co tionnv a ler
sio

300

dg/dn= 40 × 10-17
dg/dn= 10 × 10

3000

Electric-energy cconsumption,
EB (Joulee/bit)3000

ηT=1, τC =100 ps, dg/dn=20 × 10-17 cm2
τC= 50 ps
τC=200 ps,
ηT=0.5-17

POP (mmW)
at ΔΦ=0.3 π

POP = VOP IOP (mW)at ΔΦ
Φ=0.3 π30000

J. Sakaguchi et al., Opt. Express, Oct. 2007.
Y Ueno et alY.
al., IEICE PN
PN-societysociety mtg,
mtg Dec
Dec. 2007,
2007 Tokyo
Tokyo.
UEC--KDDI collaboration project, 2005-2006.

？

1 pico

100M

1G

10G

Op
ti

w ca
(le ith n l sig
ng on na
th= lin l-p
1 m ear roc
5～30pJ/bit, H sili essin
NL caOptical signal-processing
F fibe gγ = rswith nonlinear semiconductors
30
W -1(length << 1 mm)
⋅k m

100G

1T

10T

-1

)

Bit-rate, BR (b/s)

7Ultrafast Optical Logic Lab., UEC

Our research backgrounds:

B db
Broad
bandwidthd idth off opticallyti ll wired
i d systemst(for the Industrial Systems Market)

100 THz

Opttical loss (dB/kkm)

43 THzWavelength (μm)

100-THz transmittance bandwidthof a standard, high-quality,gy silica-based single-mode-fibergcable.
8

Ultrafast Optical Logic Lab., UEC

Our research background:I
Increasingi FTTH capacity
i in
i Japan,J
Y
Year 2002-2008?

10 Peta
1016
1 Peta1015

C
Consumermarketk t
in Japan

FTTH: optically wired.

10?

10 Tera13

2002/03
03/
2002

CATV (8M)
mobile(200k)MOBILE(200k)

1 Tera1012

2004/03
03/

20052006/03

2008/03
03/
2008

Month/Year

mobile: electrically wireless.

DSL (10M)?

10

DSL&CATV: electrically wired.

FTTH (100M)

2010/03

9

1 Billion
10?

10 Million
108

Sub
bscriber numbers

100 Tera
T 14

Subsccriber numbers

Subbscriber-Num
mber-times Bitt Rates (bit/seecond)Su
ubscriber-nnumber × Bit-rate C
Capacity((bit per second)((in the Consumers Market))

10 Million
107?

1 Million
106

FTTH (100M)
DSL (10M)

100 thousand105
10 thousand
10?

Consumer market
in Japan

CATV (8M)
MOBILE (200k)

4
2002/03

03/2002

03/2005

2008/03

03/2008

Month/Year

統計作成者： 総務省、2008年公式発表
表
図作成者： 大平高志・坂口淳(2005) ⇒ Nguyen Tuan Anh(2008)9Ultrafast Optical Logic Lab., UEC

examples ofExperimental resources
resources, --2008
2008 present
http://www1.ttcn.ne.jp/gagnon/resources-e.html

10Ultrafast Optical Logic Lab., UEC

examples ofExperimental resources
resources, --2008
2008 present
http://www1.ttcn.ne.jp/gagnon/resources-e.html

Proto-type disc-loop
mode-locked pulse laser (G1, 2005)

200-Gb/s data-signal source, and,high-resolution monitor system (2008)((commercial
i l mode-lockedd l k d pulse
l sources,
data-pattern modulators,
homemade optical MUX’s, optical amps, e tc.,)

Custom SOA chips
reliably coupled tolensed-optical-fiber cables
for studying their physical highhigh-speed
speed limits!

Eye patterns of

12 5 Gb/s NRZ signals
12.5-Gb/s(by Sakaguchi and Nishida)

Commercial optical MUX
MUX’ss, optical amps
amps,
optical cross-correlator,
high-precision electronic spectrum analyzer

11

Ultrafast Optical Logic Lab., UEC

Collaboration research activities
http://www1.ttcn.ne.jp/gagnon/lab-j.html

Our lab – NEC R&D Center (Dr. Tajima), 2003
Our lab – MIC/NICT project members,
members 2003-2005
2003 2005
Our lab – UEC-COE-program members, 2003-2007
Our lab – Technical Univ. Denmark (Dr. Nielsen, Prof. Mork), 2004-2005
Our lab – KDDI R&D Center (Dr. Nishimura), 2004-2005
Our lab – Univ. Tsukuba and AIST (METI/NEDO project), 2005-2007
Our lab – Japan Aviation Electronics Industries,
Industries Ltd.,Ltd 2006-2007
Our lab – MIC/NICT (Dr. Wada), 2007--

12

Ultrafast Optical Logic Lab., UEC

Grad- and undergrad-student
gmembers,, FY2008
http://www1.ttcn.ne.jp/gagnon/lab-e.html#members

13

Ultrafast Optical Logic Lab., UEC

Grad- and undergrad-student
gmembers
http://www1.ttcn.ne.jp/gagnon/lab-e.html#members

Optical phase-bias condition
by Nagasue, 2003

we’re walking step-by-step towards
opening our laboratory
to anybody inside and outside campus

our future life …

Graduated students
from our master- and doctor-courses

open laboratory

14

Ultrafast Optical Logic Lab., UEC

Travels to conferences
http://www1.ttcn.ne.jp/gagnon/research-travels.html

15

Ultrafast Optical Logic Lab., UEC

Global spreads and collaborations (SMZ-DISC-related gate research)societies from IEEE LEOS, OSA, JSAP, IEICE(OFC, ECOC, CLEO, IPRM)

MIT LL、MIT
Princeton Univ.
Bell Holmdel
UCSB *)UC Davis
UCLA
AlphionBT Labsa s
ETH
TU Denmark *)HHI
CIP
TU Eindhoven *)Univ. Cork

NEC/FESTA(NEDO)
KDDI
Univ. Tokyo
Mitsubishi (NEDO)Tokyo Inst.
Inst Technol.
Technol *))Univ. Tsukuba, AIST *)Univ. of Electro-Comm.

*) owns strong facilities for
optical semiconductor integrations
not very much yet,from China and India
16

Ultrafast Optical Logic Lab., UEC

Selected publications, 2005-present
Journal Papers
•
•

•

•

•

•

•

•

http://www1.ttcn.ne.jp/gagnon/publications.html

J. Sakaguchi, M.L. Nielsen, T. Ohira, R. Suzuki, and Y. Ueno, 'Observation of small sub-pulses out of the delayedinterference signal-wavelengthgg converter,', Jpn.
p J. Appl.
pp Phys
y vol. 44,, no. 44,, pp.
pp L1358-1360,, Oct. 2005.
M.L. Nielsen, J. Mørk, R. Suzuki, J. Sakaguchi, and Y. Ueno, 'Theoretical and experimental study of fundamental
differences in the noise suppression of high-speed SOA-based all-optical switches,' Optics Express vol. 13, no. 13, pp.
5080-5086, June 2005.
M.L. Nielsen, J. Mørk, R. Suzuki, J. Sakaguchi, and Y. Ueno, 'Experimental
Experimental and theoretical investigation of the
impact of ultra-fast carrier dynamics on high-speed SOA-based all-optical switches,' Optics Express, vol. 14, no. 1,
pp. 331-347, Jan. 2006.
Y. Ueno, M. Toyoda, R. Suzuki, and Y. Nagasue, 'Modeling of the polarization-discriminating-symmetric-MachZehnder-type
Zehndertype optical
optical-3R
3R gate scheme and its available degree of random
random-amplitude-noise
amplitude noise suppression,
suppression ' Optics
Express, vol. 14, no. 1, pp. 348-360, Jan. 2006.
Y. Ueno, R. Nakamoto, J. Sakaguchi, and R. Suzuki, 'Optical-spectrum-synthesizer design within an all-opticalsemiconductor gate to reduce waveform distortion induced by carrier-cooling relaxation at sub-Teraherz
frequencies ' Optics Express vol.
frequencies,
vol 1414, nono. 2626, pppp. 12655-12664
12655 12664, Dec 25
25, 2006
2006.
Jun Sakaguchi, Ferran Salleras, Kohsuke Nishimura, and Yoshiyasu Ueno, "Frequency-dependent electric dc
power consumption model including quantum-conversion efficiencies in ultrafast all-optical semiconductor gates,"
Optics Express vol. 15, no. 22, pp. 14887-14900, Oct. 2007.
Jun Sakaguchi,
Sakaguchi Mads L
L. Nielsen
Nielsen, Takashi Ohira
Ohira, Rei Suzuki,
Su uki and Yoshiyasu
Yoshi asu Ueno,
Ueno “AnalAnalysis
sis of sub
sub-pulse
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.
Jun Sakaguchi, Takehiro Nishida, Yoshiyasu Ueno, “200-Gb/s wavelength conversion using a delayed-interference
all-opticalll ti l semiconductorid t gatet assisted
i t dbby nonlinearlipolarizationl i ti rotation,”t ti ” O
Opticsti C
Comm. vol.
l 282
282, no. 99, pp. 1728
17281733, May 2009.

17

Ultrafast Optical Logic Lab., UEC

Selected publications, 2005-present
Conferences Talks (except invited)•

http://www1.ttcn.ne.jp/gagnon/publications.html

M.L. Nielsen, J. Mørk, J. Sakaguchi, R. Suzuki, and Y. Ueno, 'Reduction of nonlinear patterning effects in SOA-based all-optical switches
using optical filtering', Optical Fiber Communication Conference (OFC 2005), Los Angeles, USA, March 6-11, 2005, paper OThE7.

•

J. Sakaguchi, M.L. Nielsen, T. Ohira, R. Suzuki, and Y. Ueno, 'Observation of small sub-pulses generated in the DISC-type wavelength
converter,' 10th Optoelectronics and Communications Conference (OECC 2005), Seoul, Korea, July 5-8, 2005, paper 8F1-4.

•

R. Suzuki, S. Kobayashi, J. Sakaguchi, and Y. Ueno, 'Threshold condition for pulse generation from a DISC-loop-type pulse generator,'
IQEC/CLEO PR July
IQEC/CLEO-PR,
J l 11-15,
11 15 2005
2005, Tokyo,
T kpaper CMF1-4,
CMF1 4 pp. 1522
1522-1523.
1523•

J. Sakaguchi, Y. Ueno, K. Nishimura, and T. Yazaki, 'New method for characterizing the injected-carrier-to-photon conversion efficiencies
inside the ultrafast all-optical semiconductor gates,' 9th International Symposium on Contemporary Photonics Technology (CPT 2006),
Tokyo, Jan. 11-13, 2006, paper no. P-26, pp. 130-131.

•

R. Suzuki, T. Ohira, J. Sakaguchi, and Y. Ueno, '40-GHz
40 GHz mode
mode-locked
locked pulse generation with a new scheme of SOA
SOA-basedbased pulse generation,
generation,'
CLEO/QELS 2006, May 21-26, 2006, Long beach, USA, paper no. CMG5.

•

J. Sakaguchi, Y. Ueno, K. Nishimura, and T. Yazaki, 'New method for characterizing the injected-carrier-to-photon conversion efficiencies
inside the ultrafast all-optical semiconductor gates,' Optical Amplifiers and their Applications (OAA 2006), June 25-28, 2006, Whisler,
Canada, paper no. OTuC4.

•

Jun Sakaguchi, Ferran Salleras, and Yoshiyasu Ueno, "Frequency-dependent electric dc power consumption in ultrafast all-opticalsemiconductor gates," 12th Optoelectronics and Communications Conference (OECC 2007), July 9-13, 2007, Yokohama, Japan, paper no.
10D2-3.

•Ferran Salleras, Masanori Honma, Jun Sakaguchi, Yoshiyasu Ueno, Nobuhiko Ozaki, Yoshinori Kitagawa, Kiyoshi Asakawa, Naoki Ikeda,
Y hi
Yoshimasa
Sugimoto,
S i t "Criterion"C it i forf removing
i a delayedd ld peakk fromf
theth ultrafast
lt f t nonlinearli
response off photonic
h t i crystal/quantum
t l/
t
d t
dot
waveguides," 1st Nonlinear Photonics Topical Meeting (NP 2007), Optical Society of America, Quebec city, Canada, Sept. 2-6, 2007, paper
no. NTuC6.

•

Ryoichi Nakamoto, Hiroyuki Takeuchi, Jun Sakaguchi, and Yoshiyasu Ueno, "1.55-um, mode-locked, single-longitudinal-mode, 10-GHz, 2ps, ultra
ultra-short
short optical pulse train from our original semiconductor
semiconductor-based
based pulse-source
pulse source scheme,
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.

18

Ultrafast Optical Logic Lab., UEC

Invited Talks ((international),), 2001-presentp
http://www1.ttcn.ne.jp/gagnon/publications.html
Y. Ueno, S. Nakamura, and K. Tajima,j"Ultrahigh-speed
g pdata regenerationgand wavelengthgconversion for OTDM systems," ECOC 2001, Amsterdam, the Netherlands.
Y. Ueno, S. Nakamura, and K. Tajima, "Ultrafast SOA-based SMZ-type all-optical regenerators
and wavelength converters," ssdm 2002, Nagoya, Japan
S. Nakamura, T. Tamanuki, Y. Ueno, and K. Tajima, "Ultrafast optical demultiplexing,
regeneration, and wavelength conversion with symmetric-Mach-Zehnder all-optical switches,"
OFC 2003, Atlanta, USA.
Y. Ueno, 'All-optical signal processing for over-100-Gb/s optical TDM networks,' IEEE LEOS
Annual Meeting (LEOS 2003), Tucson, USA.
G. Theophilopoulos, Y. Ueno, and S.A. Hamilton, panel discussion 'Outlook in 10-20 years,'
OFC workshop
k h 'All-optical'All ti l wavelength
l gth conversion
i andd signal
ig l processing
i g forf nextt generationgti
network,' OFC 2005, Los Angeles, USA.
Y. Ueno, M. Toyoda, and R. Suzuki, 'Theoretical models of the SOA-based SMZ-type optical-3R
gates,', OSA-OAA 2005,, Budapest,gp , Hungary.
g y
Yoshiyasu Ueno, Jun Sakaguchi, Ryoichi Nakamoto, and Takehiro Nishida, "Ultrafast, lowenergy-consumption, semiconductor-based, all-optical gate devices (Invited Talk)," 4th AsiaPacific Microwave Photonics Conference (APMP 2009), April 22-24, 2009, Beijing, P.R. China.
19

Ultrafast Optical Logic Lab., UEC

-20

1.5

u.)
Intensity (a.

Our alumni members who joined global industry and academy

Distan
-10

Gated

1.0

100

ce in air, z (m

0

m)

+10
wave
form,
100
1540
010
nm
111
…

+20

0.5

0

-75

-50

-25

0

Time +25 +50 +75(ps)

http://www1.ttcn.ne.jp/gagnon/professionals-e.html
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NEC Communication Systems, Ltd.
Hitachi Cable, Ltd.
OAS Co., Ltd.
Tokyo Institute of Technology (Titech)
Mie Bank., Ltd.
Electric Power Development Co., Ltd. (J-Power)
eAccess, Ltd.
Hitachi Communication Technologies, Ltd.
I
Innotecht hC
Corporationti
NEC Corporation (System device research laboratories, Ohtsu city)
Hitachi Kokusai Electric, Inc.
Fujitsu Access, Limited
NEC Corporation (computer division, Fuchu city)
Sumitomo Electric Industries, Ltd. (Yokohama city)
Nara Institute of Science and Technology, Research Associate
Bookham, Inc. (Zurich plant, Switzerland)

20

Ultrafast Optical Logic Lab., UEC

statistics of:

our National University of Electro
Electro-Communications
Communications
http://www.uec.ac.jp/eng/index.html

Location: Chofu city, Tokyo (border between metropolitan and suburb areas), Japan
Number of faculty members: 350
Number of bachelor students: 4,400 (120 from outside japan)
Number of grad students: 1
1,400
400 (180 from outside japan)
number of foreign students: 300 (more than half from China)
Number of affiliated international universities: about 20 (China, Australia, Thai, Estonia, etc.)
Center-of-Excellence (COE) Program (physics category of MEXT):
program’s title: Innovation in Coherent Optical Sciences, 2003-2007
CEP-locked frequency-comb,qy, bose-einstein-condensation,, atomic optics,p, etc.
http://www.ils.uec.ac.jp/COEcoherent/eng/index.html
number of original member professors: 22
more biased to PhD students than bachelor students.

21

Ultrafast Optical Logic Lab., UEC

Yoshiyasu Ueno, Prof. Dr.
Members of IEEE, OSA, and JSAP.
1961: born in Osaka, Japan.
1987: received Master’s degree of Physics, Univ. of Tokyo.
1987-1994: AlGaInP crystal growth and 680-nm red lasers, Opto-Electronics Research Labs. , NEC Corp.
1995-1996: visiting researcher in CREOL/UCF, USA.
1998: received PhD degree of Applied Physics, Univ. of Tokyo.
1996-2002: Ultrafast all-optical semiconductor gates, Opto-Electronics Research Labs. , NEC Corp.
2002-present: National University of Electro-Communications, Tokyo.

Times of Citations (Thomson-Reuters database):
Total times cited
cited= 900• 400 from authored and 500 from co-authored SCI-indexed journal papers in 1987-2009.
• average times cited= 900 / 50 journal papers = 18 times per paper (as of March 2010).

Invited Talks:• Y. Ueno, S. Nakamura, H. Hatakeyama, T. Tamanuki, T. Sasaki, and K. Tajima, "168-Gb/s OTDM wavelength conversion using SMZ-type all-opticalswitch," 26th European Conference on Optical Communication (ECOC 2000), Sept. 4-7, 2000, Munich, Germany.
• Y. Ueno, 'All-optical signal processing for over-100-Gb/s optical TDM networks (Invited Talk),' IEEE LEOS Annual Meeting (LEOS 2003), Oct. 26-30,
2003, Tucson, USA.
• G.
G Theophilopoulos,
Theophilopoulos Y.
Y UenoUeno, and S.A.
S A Hamilton,
Hamilton panel discussion 'Outlook
Outlook in 10
10-20
20 years (invited),(invited) ' OFC workshop 'All
All-optical
optical wavelength conversion
and signal processing for next generation network,' Optical Fiber Communication Conference (OFC 2005), Los Angeles, March 6-11, 2005.
• Y. Ueno, M. Toyoda, and R. Suzuki, 'Theoretical models of the SOA-based SMZ-type optical-3R gates (Invited talk),' Optical Amplifiers and their
Applications (OAA 2005), Budapest, Hungary, August 7-10, 2005.
• Yoshiyasu Ueno, Jun Sakaguchi, Ryoichi Nakamoto, and Takehiro Nishida, "Ultrafast, low-energy-consumption, semiconductor-based, all-optical gatedevices ((Invited Talk),"), 4th Asia-Pacific Microwave Photonics Conference ((APMP 2009),), Aprilp 22-24,, 2009,, Beijing,
j g, P.R. China. digest.
g• Yoshiyasu Ueno, "Roadmap of ultrafast energy-saving optical semiconductor devices to Year 2025 (Invited Talk)," 42nd International Conference on
Solid Sate Devices and Materials (ssdm2010), Sept. 22-24, 2010, Univ. of Tokyo, Tokyo, Japan.

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Ultrafast Optical Logic Lab., UEC

Memorandum

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Ultrafast Optical Logic Lab., UEC