Ueno Laboratory, National University of Electro-Communications, Tokyo, Japan

Research Themes in FY2008-FY2011

2009/11/19 Yoshiyasu Ueno
2010/01/06 Yoshiyasu Ueno

(1) Innovative device-schemes research with using optical semiconductor materials,
for both accelerating all-optical gates and for saving their dc-electric-energy consumptions
ref: Ueno 2009, http://www.ultrafast.ee.uec.ac.jp/pubs/ueno-apmp2009.pdf(a) Physical modeling for reducing the electric-energy consumption levelof all-optical gates, with optically accelerating the gates (for 10-200 Gb/s and 1-10 pJ/bit).
ref: Sakaguchi et al. 2007, http://www.ultrafast.ee.uec.ac.jp/pubs/sakaguchi-optics-express2007.pdf
Sakaguchi PhD thesis 2008, http://www.ultrafast.ee.uec.ac.jp/pubs/sakaguchi-thesis2008.pdf(b) Optical frequency synthesis, for compensating forultrafast material's inherently distorted relaxation behaviors (for 300G and beyond).
ref: Nishida et al. 2009, http://www.ultrafast.ee.uec.ac.jp/pubs/nishida-ieee-leos2009.pdf--- new idea in the world--- new idea in the world(c) Optical XOR gating, with building ultrafast data generators and their monitoring systems,
for getting closer to practical future-applications.
(d) Ultrahigh-presicion, ultrafast, tunable, optical frequency comb-clock generation.
ref: Suzuki et al. 2006, http://www.ultrafast.ee.uec.ac.jp/pubs/suzuki-cleo2006.pdf--- new idea in the world(2) More applied-physics research on optical semiconductor materials(*) with custom-ordered and commercial SOA chips from top-level vendor companies CIP (UK) and InPhenix (USA).
(a) Characterizing gate transmittance in degenerate-frequency input scheme--- continuing as a part of research (1)(d)(b) Characterizing degree of optical acceleration in original degenerate-frequency input scheme, with respect to that inconventional non-degenerate-frequency
non degenerate frequency input scheme.
scheme ref: Yamaji et al.
al 2008-2009
2008 2009 (unpublished)(unpublished).
--- new idea in the world(c) Characterizing the unknown upper limits of all-optical gate speeds,
being influenced by electron's equilibrium-temperature relaxation processes(3) Original developments of our ultrafast, experimental facility and techniques(a) Home-made pump-and-probe, optical heterodyne characterization techniques with sub-picosecond temporal resolution,
for any fast materials in wavelength range from 1.1 to 1.7 microns. ref: Salleras et al. 2007, http://www.ultrafast.ee.uec.ac.jp/pubs/honma-aict2007.pdf
http://www1.ttcn.ne.jp/gagnon/research-activities.html#pump-and-probe(b) Home-made broad-band optical-gain-spectrum characterization tequniques, for characterizing more broadly than conventional C band.
(c) High-stability, high-density-electron injection techniques, for dc-biasing electron-hole density with strongly accelerating the gates.
(d) Optical data multiplexing and waveform monitoring techniques,for our experiments with 200-Gb/s optical signals and beyond.
((e)) Numerical simulators,, for modelingg the core pparts of our devices and experimentspref: Ueno, Toyoda et al. 2006, http://www.ultrafast.ee.uec.ac.jp/pubs/ueno-toyoda-pdsmz-oe2006.pdf
Ueno, Nakamoto et al. 2006, http://www.ultrafast.ee.uec.ac.jp/pubs/nakamoto-optics-express2006.pdf

2010/1/14

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Ultrafast Optical Logic Lab., UEC