Ikuo YAMASHITA

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Name
Ikuo YAMASHITA
URL
http://www.kepco.co.jp/english/rd/index.html
Affiliation
THE KANSAI ELECTRIC POWER CO., INC.
Section
Power Engineering R&D Center
Degree
Ph.D

Research Areas

 
 

Published Papers

 
山下育男, 森村俊, 村井仁, 小川理, 黒野正裕
電気学会論文誌 C   136(7) 887‐892(J‐STAGE)   2016
山下育男, 日野政則, 墨忠彦
電気学会論文誌 C   135(11) 1347-1348 (J-STAGE)   2015
Yamashita Ikuo, Inafune Koji, Kishimoto Tadashi, Kagawa Masatoshi, Murai Hitoshi
IEEJ Transactions on Electronics, Information and Systems   133(5) 1094-1095   2013
All optical signal sampling technique for an optical phase shift keying (OPSK) signal applying a periodically poled LiNbO3 (PPLN) wavelength converter is proposed and its performance is experimentally investigated. Using difference frequency gener...
Yamashita Ikuo, Tsutsumi Yasuhiro, Ohashi Masaharu
IEEJ Transactions on Electronics, Information and Systems   133(11) 2062-2067   2013
Novel technique for measuring a position of a fiber with a high birefringence is proposed using polarization optical time domain reflectometer (P-OTDR) for the purpose of detecting the defective section in the optical transmission line. Our techni...
YAMASHITA Ikuo, INAFUNE Koji, KISHIMOTO Tadashi, KAGAWA Masatoshi, MURAI Hitoshi
IEEJ Transactions on Electronics, Information and Systems   132(7) 1200-1201   Jul 2012
In order to observing a waveform of a high symbol-rate optical signal, all optical signal sampling technique using a periodically poled LiNbO3 (PPLN) wavelength converter is experimentally investigated. An optical gate is realized by a chirped PPL...
YAMASHITA Ikuo, KANAOKA Yasuhiro, KASHIMURA Satoru, SHIMIZU Satoru
IEEJ Transactions on Electronics, Information and Systems   132(2) 332-333   Feb 2012
MIMO is a mighty method to increase data rate of wireless LAN systems. It is necessary to keep a suitable distance between each antenna to work MIMO function effectively, especially in the poor multipath environment. Then the radio over fiber tech...
YAMASHITA Ikuo, KAGAWA Masatoshi, INAFUNE Koji, MURAI Hitoshi
IEEJ Transactions on Electronics, Information and Systems   131(8) 1514-1515   Aug 2011
All optical signal sampling technique using a high nonlinear fiber is experimentally investigated in order to observing a waveform of a high symbol-rate optical signal. Optical sampling pulses having time width of 2.8 ps are generated from an outp...
SHIMIZU Satoru, KANAOKA Yasuhiro, KASHIMURA Satoru, YAMASHITA Ikuo
The transactions of the Institute of Electronics, Information and Communication Engineers. B   94(7) 793-801   Jul 2011
TSUTSUMI Yasuhiro, OHASHI Masaharu, YABU Tetsuro, ORO Kyoichi, YAMASHITA Ikuo
The transactions of the Institute of Electronics, Information and Communication Engineers. B   93(8) 1043-1050   Aug 2010
YAMASHITA Ikuo, ITO Kazuhiro
IEEJ Transactions on Electronics, Information and Systems   130(5) 905-906   May 2010
Optical signal power estimation utilizing an improved optical fiber identifier is experimentally evaluated. In order to realize fine measurement, a mechanical bend adjuster and fiber guides attached to both side of the identifier are introduced. T...
YAMASHITA Ikuo, FUJII Akihiro, MURAI Hitoshi, FUJII Kozo
IEEJ Transactions on Electronics, Information and Systems   129(4) 762-763   Apr 2009
An OTDM access system transmitting 4×10Gb/s signal is proposed. All-optical parallel-serial conversion technique using XAM (Cross-absorption modulation) in an EA modulator (EAM) is applied for MUX/DEMUX of the signals. Transmission experiment is c...
KANAOKA Yasuhiro, YAMASHITA Ikuo, KASHIMURA Satoru, ASANO Kinya, SHIMIZU Satoru
The transactions of the Institute of Electronics, Information and Communication Engineers. C   91(1) 61-63   Jan 2008
ORO Kyoichi, HATADA Hiroki, YAMASHITA Ikuo, OHASHI Masaharu
IEEJ Transactions on Electronics, Information and Systems   128(1) 152-153   Jan 2008
The measuring technique of Raman gain efficiency along the transmission line composed of optical fibers and connectors based on the OTDR is proposed. It is a simple method of estimating Raman gain efficiency from the backscattered powers with and ...
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki
IEEJ Transactions on Electronics, Information and Systems   127(11) 1951-1952   Nov 2007
A novel vibration sensing scheme using a technique of converting the vibration into position modulated optical pulses is described. The laser light whose wavelength changes at a cycle of several kHz is launched into a fiber and passes through an o...
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki
IEEJ Transactions on Electronics, Information and Systems   127(8) 1266-1267   Aug 2007
A fiber optic powering data link is experimentally investigated using an optical fiber installed outside. Two optical fibers are prepared for parallel use in respect to the powering lights and for a loop structure for the signal light. High power ...
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki
IEEJ Transactions on Electronics, Information and Systems   127(3) 324-329   Mar 2007
A field experiment on transmission of 80-Gbit/s-based wavelength division multiplexing (WDM) signals is successfully carried out. In order to keep good transmission quality, technique of an in-service dispersion monitoring and an adaptive control ...
ORO Kyoichi, YAMASHITA Ikuo, SEIKAI Shigeyuki
IEEJ Transactions on Electronics, Information and Systems   126(11) 1290-1295   Nov 2006
Three kinds of clock recovery circuit for 40-Gbit/s optical RZ signals are fabricated and their characteristics are compared. The three schemes comprise a phase lock loop (PLL) including a voltage-controlled oscillator, an injection locking, and a...
ORO Kyoichi, YAMASHITA Ikuo, SEIKAI Shigeyuki
IEEJ Transactions on Electronics, Information and Systems   126(1) 134-135   Jan 2006
A novel structure of an all optical clock signal extraction circuit for NRZ signals is proposed. Polarization independent operation is achieved by the bi-directional use of a Mach-Zender interferometer for optical XOR operation. Applying the circu...
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki
IEEJ Transactions on Electronics, Information and Systems   125(3) 532-533   Mar 2005
Raman amplification has many attractive features. In case of WDM transmission through standard SMFs a dispersion compensation fiber (DCF) is effectively united with a Raman amplifier by launching pump light into the DCF. We propose a novel Raman a...
MAEDA Junya, KANAYA Daisuke, SAWADA Hisashi, FUJITA Moriyuki, YAMASHITA Ikuo, SEIKAI Shigeyuki
IEEJ Transactions on Electronics, Information and Systems   125(2) 255-259   Feb 2005
Transversal single mode fiber laser at 1116nm constructed by both a high optical output diode laser and an air-hole type double-clad fiber has been developed for the 1310nm Raman amplification. The special edge filters without substrates make poss...
Seikai Shigeyuki, Oro Kyoichi, Yamashita Ikuo, Inokuchi Masaji
IEEJ Transactions on Electronics, Information and Systems   125(10) 1608-1613   2005
A 10-GHz clock signal is successfully extracted from a 160-Gbit/s optical RZ signal using devices operable up to 40 GHz. The down-conversion of the 160-Gbit/s input signal into 40 Gbit/s signal is performed by modulating the input optical signal b...
ORO Kyoichi, SEIKAI Shigeyuki, YAMASHITA Ikuo
IEEJ Transactions on Electronics, Information and Systems   124(8) 1642-1643   Aug 2004
A field experiment on transmission of eight 40-Gbit/s WDM channels is successfully carried out, where a 240-km optical transmission line is composed of four 60-km SMFs in an OPGW and three optical amplifiers. A few experimental studies on effectiv...
SEIKAI Shigeyuki, YAMASHITA Ikuo
IEEJ Transactions on Electronics, Information and Systems   124(2) 576-577   Feb 2004
Clock signal extrtaction from 40-Gbit/s signals based on injection loocking is demonstrated. The loop frequency is 20 GHz, which enables efficient frequency down conversion and system cost down. Basic characteristics of locking range, phase noise,...
YAMASHITA Ikuo, SHISHIDA Hirihiko, SEIKAI Shigeyuki
The Transactions of the Institute of Electrical Engineers of Japan. C   122(4) 564-571   Apr 2002
YAMASHITA Ikuo, INOGUCHI Masaji, SEIKAI Shigeyuki
The Transactions of the Institute of Electrical Engineers of Japan. C   122(4) 557-563   Apr 2002
KANAOKA Yasuhoro, YAMASHITA Ikuo, SHIMOURA Kazuhiro, SEIKAI Shigeyuki, INOGUCHI Masaji
The Transactions of the Institute of Electrical Engineers of Japan. C   120(3) 330-336   Mar 2000
YAMASHITA Ikuo, SEIKAI Shigeyuki, SAWA Shinnosuke
The Transactions of the Institute of Electrical Engineers of Japan. C   120(3) 322-329   Mar 2000
YAMASHITA Ikuo, SEIKAI Shigeyuki, SUZUKI Takuya, KATOU Tomoyuki, OMURA Hideyuki
The Transactions of the Institute of Electrical Engineers of Japan. C   119(12) 1528-1534   Dec 1999
YAMASHITA Ikuo, INOGUCHI Masaji, SEIKAI Shigeyuki
The Transactions of the Institute of Electrical Engineers of Japan. C   119(6) 753-759   Jun 1999
YAMASHITA Ikuo, SEIKAI Shigeyuki, INOGUCHI Masaji
The Transactions of the Institute of Electrical Engineers of Japan. C   118(3) 448-454   Mar 1998
YAMASHITA Ikuo, SEKIKAI Shigeyuki, MIYAZAKI Shigeru
118(2) 285-286   Feb 1998
YAMASHITA Ikuo, SHIMOURA Kazuhiro, SEIKAI Shigeyuki
The Transactions of the Institute of Electrical Engineers of Japan. C   117(10) 1521-1528   Oct 1997
YAMASHITA Ikuo, SEIKAI Shigeyuki
Trans. IEE of Japan, C   117(5) 662-663   May 1997

Misc

 
山下育男
R&D News Kansai   484 6-7   Jan 2016
YAMASHITA Ikuo
The journal of Reliability Engineering Association of Japan   33(1) 29-34   Jan 2011
YAMASHITA Ikuo
The Journal of the Institute of Electronics, Information, and Communication Engineers   91(8) 721-726   Aug 2008
YAMASHITA Ikuo
Technical report of IEICE. OFT   103(474) 1-4   Nov 2003
Taking up of telecommunication service through FTTH network seems to be delayed compared to initially expected pace. Nevertheless, field engineering for constructing the FTTH Network becomes rich. Service area of the FTTH has been widen and techni...

Conference Activities & Talks

 
杉山勇汰, 山本真一郎, 畠山賢一, 山下育男
電子情報通信学会技術研究報告   9 Sep 2016   
山下育男, 金岡泰弘, 前田達夫, 土屋弘昌, 宮下充史
エネルギー・資源学会研究発表会講演論文集(CD-ROM)   2016   
山下育男, 森村俊, 村井仁, 小川理, 黒野正裕
電気学会電子・情報・システム部門大会講演論文集(CD-ROM)   26 Aug 2015   
山下育男, 日野政則, 墨忠彦
電気関係学会関西連合大会講演論文集(CD-ROM)   11 Nov 2014   
Kanaoka Y., Hatamoto H., Shimizu S., Yamashita I.
Proceedings of the Society Conference of IEICE   28 Aug 2012   
Yamashita I., Mabuchi K., Takeuchi Y.
Proceedings of the IEICE General Conference   28 Feb 2011   
YAMASHITA Ikuo, KAGAWA Masatoshi, INAFUNE Koji, MURAI Hitoshi
18 Nov 2010   
Yamashita Ikuo, Tsutsumi Yasuhiro, Ohashi Masaharu
Proceedings of the Society Conference of IEICE   31 Aug 2010   
Yamashita I., Mabuchi K., Takeuchi Y.
Proceedings of the Society Conference of IEICE   31 Aug 2010   
KANAOKA Yasuhiro, YAMASHITA Ikuo, KASHIMURA Satoru, SHIMIZU Satoru
26 Nov 2009   
KANAOKA Yasuhiro, YAMASHITA Ikuo, KASHIMURA Satoru, SHIMIZU Satoru
Technical report of IEICE. OFT   19 Nov 2009   
Radio over fiber technique (ROF) is attractive method for wireless communication. Because the number of wireless equipment can be reduced by dividing and combining of optical signals on the optical fiber and major equipment can be located in a bas...
ORO Kyoichi, YAMASHITA Ikuo, TSUTSUMI Yasuhiro, YABU Tetsuro, OHASHI Masaharu
20 Nov 2008   
ORO Kyoichi, YAMASHITA Ikuo, TSUTSUMI Yasuhiro, YABU Tetsuro, OHASHI Masaharu
Technical report of IEICE. OFT   13 Nov 2008   
An indirect measurement technique for Raman gain efficiency distribution along the transmission line based on the OTDR is proposed. Our proposed technique is a novel and simple technique for estimating Raman gain efficiency distribution by utilizi...
YAMASHITA Ikuo, ORO Kyoichi, MIYAO Kazuaki, SEIKAI Shigeyuki
22 May 2008   
YAMASHITA Ikuo, FUJII Akihiro, MURAI Hitoshi, FUJII Kozo
21 Nov 2007   
YAMASHITA Ikuo, FUJII Akihiro, MURAI Hitoshi, FUJII Kozo
Technical report of IEICE. OFT   14 Nov 2007   
An OTDM access system transmitting 4×10Gb/s signal is proposed. All-optical parallel-serial conversion technique using XAM (Cross-absorption modulation) in an EA modulator (EAM) is applied for MUX/DEMUX of the signals. Injecting a 40Gb/s signal an...
FUJII Akihiro, MURAI Hitoshi, FUJII Kozo, YAMASHITA Ikuo
Technical report of IEICE. OCS   4 May 2007   
All-optical signal processing such as optical-switching and optical signal regeneration is one of promising technologies to construct future ultra high capacity photonic networks. XAM (Cross-absorption modulation) in an EA waveguide enables ultra ...
FuJII Akihiro, MURAI Hitoshi, FUJII Kouzou, YAMASHITA Ikuo
Proceedings of the IEICE General Conference   7 Mar 2007   
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki
Technical report of IEICE. OFT   9 Nov 2006   
A novel vibration sensor using a technique of converting the vibration into position modulated optical pulses is described. The laser light whose wavelength changes at a cycle of several kHz is launched into a fiber and passes through an optical f...
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki
24 Nov 2005   
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki
Technical report of IEICE. OFT   17 Nov 2005   
Field experiment on 80Gbit/s×8WDM transmission through an OPGW with 60km×2span is carried out. In the experiment, useful method of an in-service monitoring and adaptive control of the chromatic dispersion is proposed. Difference of the propagation...
Yamashita Ikuo, Oro Kyoichi, Seikai Shigeyuki, Inokuchi Masaji
Proceedings of the Society Conference of IEICE   7 Sep 2005   
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki
26 May 2005   
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki, KANAYA Daisuke, SAWADA Hisashi
26 Nov 2004   
YAMASHITA Ikuo, ORO Kyoichi, SEIKAI Shigeyuki, KANAYA Daisuke, SAWADA Hisashi
Technical report of IEICE. OFT   19 Nov 2004   
Discrete Raman amplifier is effective for various wavelength signals, especially for those in access network systems. However, in order to apply it to access systems, it is necessary for the amplifier to support both digital and analog signal. In ...
ORO Kyoichi, YAMASHITA Ikuo, SEIKAI Shigeyuki
Technical report of IEICE. OFT   20 Nov 2003   
Field experiments for 40Gbit/s × 8 WDM transmission through an OPGW are carried out. Wavelength spacing is set at 0.8 nm. 40Gbit/s optical signals with CS-RZ format are obtained by OTDM technique and launched into the SMF. The transmission line wi...
Seikai Shigeyuki, Oro Kyoichi, Yamashita Ikuo
Technical report of IEICE. OFT   20 Nov 2003   
Characteristics of clock recovery circuits are experimentally investigated. Three kinds of circuits, phase lock loop (PLL) circuit, injection locking circuit, and circuit composed of a T-Flip-Flop are constructed. As for 80-Gbit/s the input optica...
ORO Kyoichi, YAMASHITA Ikuo, SEIKAI Shigeiyuki
20 Nov 2003   
SEIKAI Shigeyuki, ORO Kyoichi, YAMASHITA Ikuo
20 Nov 2003   
YAMASHITA Ikuo, YAMADA Kazuo, INOGUCHI Masaji, SEIKAI Shigeyuki
Technical report of IEICE. OFT   14 Nov 2001   
A Raman amplifier suitable for a 1.3-μm wavelength band is experimentally studied and net gain of 35dB and output power of 15dBm are achieved. A pump light with a wavelength of 1.23-μm that is necessary for the Raman amplification in the 1.3-μm wa...
Yamashita Ikuo, Shishida Hirihiko, Inoguchi Masaji, Seikai Shigeyuki
Technical report of IEICE. OFT   15 Nov 2000   
Single channel and two channels 40Gbit/s transmission were carried out using conventional single mode fibers of an OPGW cable installed in a field. Pulsewidth of the optical signals was 6.5ps. An error free state was confirmed for the single chann...
Shimoura Kazuhiro, Yamashita Ikuo, Shishida Hirohiko, Seikai Shigeyuki
Proceedings of the Society Conference of IEICE   7 Sep 2000   
YAMASHITA Ikuo, KANAOKA Yasuhiro, INOGUCHI Masaji, SEIKAI Shigeyuki
21 Oct 1999   
Kanaoka Yasuhiro, Yamashita Ikuo, Shimoura Kazuhiro, Seikai Shigeyuki
Proceedings of the Society Conference of IEICE   16 Aug 1999   
SHIMOURA Kazuhiro, KANAOKA Yasuhiro, YAMASHITA Ikuo, KANEDA Yasuichi, SEIKAI Shigeyuki, INOGUCHI Masaji
24 Jun 1999   
KANAOKA Yasuhiro, YAMASHITA Ikuo, SHIMOURA Kazuhiro, KANEDA Yasuichi, SEIKAI Shigeyuki, INOGUCHI Masaji
24 Jun 1999   
Kanaoka Yasuhiro, Shimoura Kazuhiro, Yamashita Ikuo, Seikai Shigeyuki
Proceedings of the IEICE General Conference   8 Mar 1999   
Seikai Shigeyuki, Yamashita Ikuo, Yoshida Minoru
Proceedings of the IEICE General Conference   8 Mar 1999   
Yamashita Ikuo, Murakami Yasuhiro, Suzuki Takuya, Katou Tomoyuki, Omura Hideyuki
Proceedings of the Society Conference of IEICE   7 Sep 1998   
SHIMOURA Kazuhiro, KANAOKA Yasuhiro, YAMASHITA Ikuo, TAKENAKA Tamotsu, SEIKAI Shigeyuki, INOGUCHI Masaji
18 Jun 1998   
KANAOKA Yasuhiro, SHIMOURA Kazuhiro, YAMASHITA Ikuo, TAKENAKA Tamotsu, SEIKAI Shigeyuki, INOGUCHI Masaji
18 Jun 1998