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 Conference Papers (Available on Advance Programs)  (Sort by: Date Descending)
 Results 1 - 20 of 24  /  [Next]  
Committee Date Time Place Paper Title / Authors Abstract Paper #
OFT, OCS, LSJ
(Joint) [detail]
2023-08-25
09:55
Hokkaido  
(Primary: On-site, Secondary: Online)
Continuous time-domain measurement method of Rayleigh backscattered light
Shiro Ryu (Meiji Univ.) OFT2023-13
We have proposed a method that enables continuous measurement of backscattered light from a specific point of an optical... [more] OFT2023-13
pp.21-26
OPE, OCS, LQE 2022-10-20
14:45
Ehime
(Primary: On-site, Secondary: Online)
Study of MIMO Optical Wireless Communication System Using Maximum Likelihood Estimation
Kouki Seitaibashi, Shiro Ryu (Meiji Univ.) OCS2022-20 OPE2022-66 LQE2022-29
The development of Internet technologies such as smartphones and computers has created congestion on mobile networks and... [more] OCS2022-20 OPE2022-66 LQE2022-29
pp.16-21
OPE, OCS, LQE 2022-10-20
15:10
Ehime
(Primary: On-site, Secondary: Online)
Signal Phase Recovery Using Digital Signal Processing in Optical Wireless Communication Systems
Ryoma Murakami, Shiro Ryu (Meiji Univ.) OCS2022-21 OPE2022-67 LQE2022-30
Research and development of optical wireless communication systems has been active. Optical receivers usually use a phas... [more] OCS2022-21 OPE2022-67 LQE2022-30
pp.22-27
OFT 2021-10-15
13:00
Online Online [Tutorial Invited Lecture] Coherent optical communication technology and my research life
Shiro Ryu (Meiji Univ.) OFT2021-48
Coherent optical communication technology was proposed at the end of the 1970s, and after about 30 years, it was put int... [more] OFT2021-48
pp.104-109
OFT, OCS, LSJ
(Joint) [detail]
2021-08-26
14:45
Online Online A method for continuously measuring backscattered light at an arbitrary point on an optical fiber
Shiro Ryu (Meiji Univ.), Takafumi Tsuboya (SECOM) OFT2021-14
We have proposed a continuous measurement method for Rayleigh backscattered light in the time domain at any point on the... [more] OFT2021-14
pp.13-18
OFT 2020-10-09
09:15
Online Online Measurement of Spatial Distribution of Fiber Birefringence by Coherent Heterodyne Detection of Rayleigth Backscattered Light
Nanako Takei, Shiro Ryu (Meiji Univ.) OFT2020-25
Since the coherent technology uses the phase information of light, it can be applied to various optical measurement tech... [more] OFT2020-25
pp.62-67
OFT 2020-10-09
09:40
Online Online Theoretical Study of Fiber Brillouin Scattering Using FDTD Method
Shiori Nozawa, Shiro Ryu (Meiji Univ.) OFT2020-26
Brillouin scattering is known as a nonlinear phenomenon that occurs in an optical fiber. So far, we have measured the a... [more] OFT2020-26
pp.68-73
OFT 2020-10-09
14:55
Online Online Optical Time/Frequency Domain Reflectometry for Continuous Time-Domain Measurement of Rayleigh Backscattered Light
Takafumi Tsuboya, Shiro Ryu (Meiji Univ.) OFT2020-35
It is not possible to measure high speed frequency fluctuations that occur in the optical transmission line because conv... [more] OFT2020-35
pp.112-117
OFT, OCS, LSJ
(Joint) [detail]
2019-08-30
09:30
Hokkaido   Dynamic Routing Experiments by Cooperation of SDN and Optical Wireless Communication
Junya Tomaki, Shiro Ryu (Meiji Univ) OCS2019-25
In recent years, communication devices such as smart phones are increasing, so the communication traffic increase has a ... [more] OCS2019-25
pp.29-34
OFT, OCS, IEE-CMN, ITE-BCT [detail] 2017-11-23
16:40
Osaka Kansa-Univ. Umeda Campus Study on Two-Dimensional Signal-to-Noise Ratio Distribution in Optical Wireless Communications
Shiro Ryu (Meiji Univ.) OCS2017-63
(Advance abstract in Japanese is available) [more] OCS2017-63
pp.35-40
OFT 2015-01-22
14:25
Miyazaki   Fiber Macrobending Radius Estimation Method by Two-Wavelength Unidirectional OTDR Measurement
Shiro Ryu (SoftBank Telecom) OFT2014-45
Macrobending of optical fibers might affect the transmission system performance if the induced loss becomes large. So, ... [more] OFT2014-45
pp.7-10
PN 2013-03-11
15:20
Okinawa Okinawa-ken Seinen-Kaikan [Invited Talk] Recent trend of wavelength unbundling in optical access network
Shiro Ryu (SoftBank Telecom) PN2012-85
Research and development of TDM/WDM-PON (TWDM-PON) system, which enables us to construct multiple TDM-PONs on the same P... [more] PN2012-85
pp.43-48
OFT, OCS, ITE-BCT, IEE-CMN
(Joint) [detail]
2012-11-22
14:15
Kumamoto   Wavelength unbundling of PON with TDM/WDM-PON system
Shiro Ryu (SoftBank Telecom) OCS2012-84
Research and development is in progress regarding TDM/WDM-PON (TWDM-PON) system that enables us to construct multiple TD... [more] OCS2012-84
pp.73-78
OCS, OFT, ITE-BCT, IEE-CMN
(Joint) [detail]
2011-11-18
14:30
Shimane Shimane Univ. OTDR measurement method for differentiating cause of loss in vicinity of fiber splice point
Shiro Ryu (SoftBank Telecom) OCS2011-103
We have been studying a novel OTDR measurement method using a macrobending indicator to measure the cause of the loss in... [more] OCS2011-103
pp.59-64
PN 2011-02-28
16:00
Kagoshima KKR Kagoshima Keitenkaku [Invited Talk] Perspective on future networks
Shiro Ryu (SoftBank Telecom Corp.) PN2010-67
We had studied intensively on wavelength path network. Our results include demonstrations on wavelength-on-demand and w... [more] PN2010-67
pp.59-64
CS, OCS
(Joint)
2010-01-29
14:30
Yamaguchi Kaikyo Messe Shimonoseki Application of all-optical 3R-regenerator to 80-Gbit/s RZ-DQPSK optical communication systems
Shiro Ryu, Mikio Yagi (SoftBank Telecom) OCS2009-116
Studies on coherent optical receivers using digital signal processing are progressing rapidly. However, applicable tran... [more] OCS2009-116
pp.93-98
OFT, OCS, IEE-CMN, ITE-BCT
(Joint) [detail]
2009-11-27
14:35
Fukushima   [Invited Talk] Proposal of fiber macrobending identification method
Shiro Ryu, Mikio Yagi (SoftBank Telecom) OCS2009-98 OFT2009-61
Macrobending loss that occurs at a junction point of optical cables might become harmful to system operation since the l... [more] OCS2009-98 OFT2009-61
pp.87-92(OCS), pp.41-46(OFT)
OCS 2008-07-17
16:05
Yamanashi   Feasibility study of 160-Gbit/s, Polarization-Division Multiplexed RZ-DQPSK Transmission System under Polarization Fluctuation over Installed Cables
Mikio Yagi, Shuichi Satomi, Shiro Ryu (Softbank Telecom) OCS2008-30
In this paper, we report the feasibility study results of 160-Gbit/s, polarization-division multiplexed (PDM) RZ-DQPSK t... [more] OCS2008-30
pp.53-58
OCS, PN, CS
(Joint)
2007-06-15
11:10
Hokkaido Chitose Inst. of Science and Technology All-optical 2R-Regenerative interconnection node for DPSK polarization-division multiplexed systems
Mikio Yagi, Shuichi Satomi, Shiro Ryu (Softbank Telecom) OCS2007-18
In this paper, we propose an all-optical 2R-regenerative interconnection node that connects wide area network (WAN) and ... [more] OCS2007-18
pp.47-52
OFT 2007-05-24
17:15
Kagoshima   Optical Fiber Nonlinearity Coefficient Measurement with Coherent Heterodyne Detection
Shiro Ryu (SBTM) OFT2007-8
Various methods have been proposed for the measurement of optical fiber nonlinearity coefficient using the self-phase mo... [more] OFT2007-8
pp.35-38
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