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Yoshiyasu Ueno
Researcher at University of Electro-Communications
Publications - 78
Citations - 1268
Yoshiyasu Ueno is an academic researcher from University of Electro-Communications. The author has contributed to research in topics: Optical switch & Optical amplifier. The author has an hindex of 18, co-authored 78 publications receiving 1262 citations. Previous affiliations of Yoshiyasu Ueno include NEC.
Papers
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Journal ArticleDOI
3.8-THz wavelength conversion of picosecond pulses using a semiconductor delayed-interference signal-wavelength converter (DISC)
TL;DR: In this paper, a delayed-interference signal-wavelength converter (DISC) is proposed, whose speed is not restricted by the carrier lifetime and its structure consists of only two essential components, namely, a semiconductor optical amplifier and a passive split delay.
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Demultiplexing of 168-Gb/s data pulses with a hybrid-integrated symmetric Mach-Zehnder all-optical switch
Shigeru Nakamura,Yoshiyasu Ueno,Kazuhito Tajima,Junichi Sasaki,Takara Sugimoto,Tomoaki Kato,T. Shimoda,M. Itoh,Hiroshi Hatakeyama,T. Tamanuki,T. Sasaki +10 more
TL;DR: In this article, a hybrid-integrated symmetric Mach-Zehnder all-optical switch was developed for demultiplexing of 168-Gb/s data pulses at a repetition rate of 10 GHz with this switch.
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Nonlinear phase shifts induced by semiconductor optical amplifiers with control pulses at repetition frequencies in the 40–160-GHz range for use in ultrahigh-speed all-optical signal processing
TL;DR: In this paper, the dependence of the nonlinear phase shift on the driving frequency and on the SOA parameters was studied. And the authors showed that the non-linear phase shifts in the SOAs linearly increase with the injection current.
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Penalty-free error-free all-optical data pulse regeneration at 84 Gb/s by using a symmetric-Mach-Zehnder-type semiconductor regenerator
TL;DR: In this article, a symmetric-Mach-Zehnder-type all-optical polarization-insensitive semiconductor regenerator was used to achieve penalty-free data-pulse regeneration at 84 Gb/s.
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Femtosecond switching with semiconductor-optical-amplifier-based Symmetric Mach-Zehnder-type all-optical switch
TL;DR: In this paper, the effect of intraband carrier dynamics on a nonlinear phase shift induced in a semiconductor optical amplifier (SOA) in terms of its applicability to the Symmetric Mach-Zehnder (SMZ) all-optical switch was investigated.