Inventor
TAKEYAMA TOMOAKI
JP42 patents
⚠️ This page may combine multiple inventors who share the name “TAKEYAMA TOMOAKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
35 patentsUS7616848B2Nov 10, 2009
Optical transmission apparatus
FUJITSU LTD8 citations84
US7330303B2Feb 12, 2008
Wavelength division multiplexed optical amplifier
FUJITSU LTD12 citations83
US7236294B2Jun 26, 2007
Optical amplifier
FUJITSU LTD9 citations74
US7085043B2Aug 1, 2006
Optical amplifier
FUJITSU LTD10 citations74
US6738182B2May 18, 2004
Optical fiber amplifier
FUJITSU LTD8 citations74
US6625362B2Sep 23, 2003
Dispersion compensating optical fiber
FUJITSU LTD11 citations74
US10644823B2May 5, 2020
Optical transfer system, control device, optical transfer method, and transfer device
FUJITSU LTD3 citations73
US10634974B2Apr 28, 2020
Wavelength converter, wavelength conversion method, and transmission device
FUJITSU LTD2 citations73
US10782589B2Sep 22, 2020
Wavelength conversion apparatus, optical parametric amplifier, transmission apparatus, and optical transmission system
FUJITSU LTD2 citations69
US11063684B2Jul 13, 2021
Optical transmission system, optical transmission apparatus and transmission method
FUJITSU LTD2 citations68
US9509370B2Nov 29, 2016
Optical transmission system and optical transmission device
FUJITSU LTD2 citations63
US8351112B2Jan 8, 2013
Optical amplifier
FUJITSU LTD2 citations63
US7139453B2Nov 21, 2006
Variable dispersion compensator utilizing wavelength conversion
FUJITSU LTD4 citations63
US11870553B2Jan 9, 2024
Fiber-optic communication apparatus, fiber-optic communication system, and optical power control method
FUJITSU LTD1 citations62
US7990608B2Aug 2, 2011
Optical transmission system
FUJITSU LTD4 citations62
US12334979B2Jun 17, 2025
Optical wavelength multiplexing transmission device and optical wavelength multiplexing transmission method
FUJITSU LTD0 citations52
US11509394B2Nov 22, 2022
Controller and control method for Raman amplifier
FUJITSU LTD0 citations52
US11294258B2Apr 5, 2022
Transmission device and transmission system
FUJITSU LTD0 citations52
US10972188B2Apr 6, 2021
Transmission apparatus and transmission method
FUJITSU LTD0 citations52
US10754224B2Aug 25, 2020
Wavelength conversion device, transmission device, and transmission system
FUJITSU LTD0 citations52
US8379299B2Feb 19, 2013
Optical amplifier
FUJITSU LTD0 citations52
US8026538B2Sep 27, 2011
Photo-detecting apparatus and photo-detecting method
FUJITSU LTD0 citations52
US7136219B2Nov 14, 2006
Optical amplifier using delayed phase matching fiber
FUJITSU LTD1 citations52
US9520694B2Dec 13, 2016
Optical amplifier with loss adjustment unit based on gain
FUJITSU LTD1 citations51
US8027082B2Sep 27, 2011
Raman amplifier and excitation light source used thereof
FUJITSU LTD0 citations51
US11018763B2May 25, 2021
Network system, management device, and management method
FUJITSU LTD0 citations50
US11153014B2Oct 19, 2021
Transmitting apparatus and transmitting method
FUJITSU LTD0 citations48
US9001413B2Apr 7, 2015
Control circuit, control method, and transmission system
FUJITSU LTD0 citations42
US8854727B2Oct 7, 2014
Optical amplifier and transmission system
FUJITSU LTD0 citations42
US8363309B2Jan 29, 2013
Optical amplifier and method for suppressing polarization dependent gain of optical amplifier
FUJITSU LTD0 citations42
US9991985B2Jun 5, 2018
Optical transmission control device and optical signal wavelength determination method
FUJITSU LTD0 citations41
US9042005B2May 26, 2015
Raman fiber amplifier and its control via path switching
FUJITSU LTD0 citations41
US8879145B2Nov 4, 2014
Raman amplifier
FUJITSU LTD0 citations41
US7643206B2Jan 5, 2010
Optical amplifier
FUJITSU LTD0 citations41
US9887778B2Feb 6, 2018
Optical amplifier, optical transmission apparatus, and optical repeating apparatus
FUJITSU LTD0 citations40
TAKEYAMA TOMOAKI
6 patentsUS8553318B2Oct 8, 2013
Optical amplifying device, gain control method, optical transmission device, and gain control device
TAKEYAMA TOMOAKI4 citations61
US8390923B2Mar 5, 2013
Optical amplifier and optical amplification method
TAKEYAMA TOMOAKI2 citations61
US8116626B2Feb 14, 2012
Optical transmission apparatus and optical attenuation amount control method
TAKEYAMA TOMOAKI4 citations61
US8922876B2Dec 30, 2014
Optical amplifying device and optical transmission system
TAKEYAMA TOMOAKI0 citations51
US8498045B2Jul 30, 2013
Optical amplifier
TAKEYAMA TOMOAKI0 citations51
US8077383B2Dec 13, 2011
Optical amplifier
TAKEYAMA TOMOAKI0 citations51