Committee |
Date Time |
Place |
Paper Title / Authors |
Abstract |
Paper # |
OFT, ITE-BCT, OCS, IEE-CMN [detail] |
2020-11-13 15:20 |
Online |
Online |
Commercialization of Coded PSP-BOTDR capable of centimeter spatial resolution in single end style Kinzo Kishida, Kenichi Nishiguchi, Artur Guzik, Li Ttken (Neubrex), Tsuneo Horiguchi (SIT), Yahei Koyamada (Ibaraki Univ.) OFT2020-42 |
(Advance abstract in Japanese is available) [more] |
OFT2020-42 pp.27-32 |
OFT, OCS, OPE (Joint) [detail] |
2016-02-18 10:20 |
Okinawa |
Okinawa Univ. |
Numerical simulation on fiber-optic distributed dynamic-strain sensing with coherent OTDR Yahei Koyamada, Mitsuharu Shiwa (NIMS), Kinzo Kishida (Neubrex) OFT2015-58 OPE2015-218 |
To investigate a potential application of the coherent OTDR in the field of measuring distributed dynamic strain or dete... [more] |
OFT2015-58 OPE2015-218 pp.17-22 |
OFT |
2013-10-25 10:20 |
Nara |
|
Numerical and Experimental Analysis of Trench-Assisted Bend Insensitive Multimode Fibers Takamitsu Aiba (Ibaraki Univ.), Tomohiro Wakabayashi (Yazaki), Masatoshi Tanaka (Mitsubishi Cable), Yahei Koyamada (Ibaraki Univ.) OFT2013-34 |
The recently development of trench-assisted bend-insensitive multimode fibers (BI-MMFs) with high bandwidth and low macr... [more] |
OFT2013-34 pp.57-62 |
OFT |
2013-01-24 14:30 |
Tokushima |
|
Improvement of receiver sensitivity and elongation of measurement range in double-pulse BOTDR Masahiro Kumoda, Yusuke Anzai, Satoshi Matsuura, Yahei Koyamada (Ibaraki Univ.) OFT2012-55 |
The receiver sensitivity of the double-pulse BOTDR was improved by 7 dB by shifting frequency band for the Brillouin sca... [more] |
OFT2012-55 pp.13-18 |
OFT |
2013-01-24 14:55 |
Tokushima |
|
Numerical simulation of fiber-optic distributed temperature measurement Masahiro Miyamoto, Taku Itou, Shigeki Takeda, Hisashi Izumita, Yahei Koyamada (Ibaraki Univ.) OFT2012-56 |
Numerical simulations were conducted to investigate the ability of a sensing system based on a coherent OTDR with a prec... [more] |
OFT2012-56 pp.19-24 |
OFT |
2013-01-24 15:20 |
Tokushima |
|
Measurement range enlargement in fiber-optic distributed strain and temperature sensing by coherent OTDR Akio Togo, Tomoaki Sudo, Hisashi Izumita, Yahei Koyamada (Ibaraki Univ.), Li Che-Hsien, Kinzo Kishida (Neubrex) OFT2012-57 |
We extended measurand range of a coherent OTDR by introducing a fully tunable DFB laser whose optical frequency can be p... [more] |
OFT2012-57 pp.25-30 |
OFT, OCS (Joint) |
2011-08-26 14:05 |
Hokkaido |
|
Fiber-Optic Distributed Temperature Measurement With Very High Resolution Over Long Range Based on Rayleigh Backscatter Traces Obtained With Coherent OTDR Akio Togo, Yuta Iitsuka, Ryosuke Shimano, Hisashi Izumita, Yahei Koyamada (Ibaraki Univ.) OFT2011-25 |
Experiments and numerical simulations were conducted to find a possible performance of a technique for measuring distrib... [more] |
OFT2011-25 pp.43-48 |
OFT, OCS (Joint) |
2011-08-26 14:30 |
Hokkaido |
|
Distributed vibration ditection with very high sensitivity using coherent OTDR Yuta Iitsuka, Akio Togo, Hisashi Izumita, Yahei Koyamada (Ibaraki Univ.) OFT2011-26 |
This paper presents some experimental results on the distributed vibration detection along a fiber based on the Rayleigh... [more] |
OFT2011-26 pp.49-52 |
OFT |
2010-10-25 15:30 |
Saitama |
Nippon Institute of Technology |
Numerical analysis of light transmission in bent trench optical fiber Yasunori Morikawa, Yahei Koyamada (Ibaraki Univ.) OFT2010-35 |
This paper presents a numerical analysis of bent trench single-mode fibers (TSMF) which have been developed as bend inse... [more] |
OFT2010-35 pp.33-38 |
OFT |
2009-10-29 14:10 |
Oita |
|
Gigabit Transmission Characteristics with Step-Index Hard Polymer Cladding Fiber Cord Takamitsu Aiba, Tomohiro Wakabayashi, Shin-ichi Furukawa (YAZAKI), Yahei Koyamada (Ibaraki Univ.) OFT2009-35 |
We evaluated transmission characteristics of a step-index hard polymer cladding fiber (SI-HPCF) cord witch has high fl... [more] |
OFT2009-35 pp.11-16 |
MW |
2009-06-30 14:45 |
Aichi |
Nagoya Institute of Technology |
Microwave phase accuracy of optically controlled phase shifter for array antenna Kenichi Yamaguchi, Daiki Takeuchi, Wataru Chujo (Meijo Univ.), Shinichi Yamamoto (NICT), Yahei Koyamada (Ibaraki Univ.) MW2009-26 |
We demonstrated highly accurate and very stable phase characteristics of microwave/millimeter-wave phase shifter for opt... [more] |
MW2009-26 pp.41-44 |
OFT |
2009-05-29 11:50 |
Shizuoka |
|
Improvement in measurement accuracy of double-pulse Brillouin optical time-domain reflectometry with signal processing technology Kazushi Oishi, Satoshi Matsuura, Shoji Adachi (Yokogawa Electric Corp.), Yahei Koyamada (Ibaraki Univ.) OFT2009-16 |
To detect the peak frequency of the Brillouin spectrum accurately is very important to achieve a high accurate strain an... [more] |
OFT2009-16 pp.75-78 |
OFT |
2009-01-23 09:00 |
Kochi |
|
Numerical simulation of nonlinear pulse propagation effect on distributed strain and temperature measurement with BOTDR Yahei Koyamada, Tetsuya Oda (Ibaraki Univ) OFT2008-79 |
This paper presents a numerical simulation on the nonlinear pulse propagation effect on the distributed strain and tempe... [more] |
OFT2008-79 pp.39-44 |
OFT |
2009-01-23 09:25 |
Kochi |
|
Numerical simulation of nonlinear pulse propagation effect on distributed strain and temperature measurement with BOTDA Yahei Koyamada, Naoya Tsuji (Ibaraki Univ.) OFT2008-80 |
This paper presents a numerical simulation of the nonlinear pulse propagation effect on the distributed strain and tempe... [more] |
OFT2008-80 pp.45-49 |
EMCJ |
2008-12-19 09:55 |
Gifu |
Gifu Univ. |
Radiation pattern control of array antenna by optical wavelength control Takashi Kano, Kenichi Yamaguchi, Wataru Chujo (Meijo Univ.), Yahei Koyamada (Ibaraki Univ.) EMCJ2008-88 |
In measurement of electromagnetic field distribution using optical electric field sensor, if sensor array with variable ... [more] |
EMCJ2008-88 pp.13-17 |
OPE, EMT, MW |
2008-07-24 10:50 |
Hokkaido |
|
[Invited Talk]
Experimental study of millimeter-wave optically controlled array antenna sharing optical phase shifters for transmission and reception Wataru Chujo (Meijo Univ.), Wataru Ohuchi (Ibaraki Univ.), Yoshiyuki Fujino (NICT), Yahei Koyamada (Ibaraki Univ.) MW2008-51 OPE2008-34 |
We have carried out the experiments of WDM-based optically controlled array antenna with wideband true-time-delay charac... [more] |
MW2008-51 OPE2008-34 pp.25-30 |
OFT |
2008-05-15 16:40 |
Osaka |
|
[Special Invited Talk]
Studies on scattering of lightwave in single-mode fibers and fiber-optic distributed strain and temperature sensors Yahei Koyamada (Ibaraki Univ.) OFT2008-8 |
This paper outlines our recent work on the simulation and design of Brillouin gain spectrum in single-mode fibers, doubl... [more] |
OFT2008-8 pp.33-38 |
AP |
2008-04-17 13:50 |
Osaka |
Osaka Electro-Communication University |
Experimental evaluation of 20-40 GHz true-time-delay characteristics for receiving optically controlled multibeam array antenna Wataru Chujo (Meijo Univ.), Wataru Ohuchi (Ibaraki Univ.), Yoshiyuki Fujino (NICT), Yahei Koyamada (Ibaraki Univ.) AP2008-6 |
In addition to the experiments of WDM-based optically controlled transmitting array antenna we have ever studied, optica... [more] |
AP2008-6 pp.29-32 |
OPE, OFT |
2008-03-07 15:45 |
Tokyo |
Kikai-Shinko-Kaikan Bldg. |
Experimental study on applicability of optical fiber to optically controlled array antenna Wataru Chujo (NICT), Wataru Ohuchi (Ibaraki Univ.), Yoshiyuki Fujino (NICT), Yahei Koyamada (Ibaraki Univ.) OFT2007-72 OPE2007-191 |
Research of optically controlled, microwave/millimeter-wave phased array antenna consists of optical feed circuit is cur... [more] |
OFT2007-72 OPE2007-191 pp.57-60 |
SANE, SAT (Joint) |
2008-02-28 14:55 |
Ibaraki |
Kashima Space Research Center (NICT) |
Experimental Study of millimeter-wave optically controlled array antenna sharing with Ku- and Ka-band frequencies Wataru Chujo (NICT), Wataru Ohuchi (Ibaraki Univ.), Yoshiyuki Fujino (NICT), Yahei Koyamada (Ibaraki Univ.) SAT2007-62 |
Research of millimeter-wave satellite communications is currently under development to realize broadband satellite commu... [more] |
SAT2007-62 pp.7-10 |