Inventor
NAKAGAWA GOJI
JP57 patents
⚠️ This page may combine multiple inventors who share the name “NAKAGAWA GOJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
45 patentsUS5960141ASep 28, 1999
Optical transmission terminal device
FUJITSU LTD228 citations97
US5883988AMar 16, 1999
Optical module including a photoreception device
FUJITSU LTD110 citations97
US5748822AMay 5, 1998
Optical module for connecting optical element and optical fiber
FUJITSU LTD95 citations97
US5647042AJul 8, 1997
Optical link module connection system
FUJITSU LTD64 citations96
US5966488AOct 12, 1999
Optical module for connecting optical element and optical fiber
FUJITSU LTD47 citations95
US6599029B2Jul 29, 2003
Ferrule assembly and receptacle type optical transmission module
FUJITSU LTD24 citations92
US6049638AApr 11, 2000
Photodetector module
FUJITSU LTD20 citations92
US6269209B1Jul 31, 2001
Resin sealed optical module
FUJITSU LTD25 citations91
US6085000AJul 4, 2000
Wavelength division multiplexing optical device and manufacturing method therefor
FUJITSU LTD23 citations91
US10948802B2Mar 16, 2021
Wavelength converter apparatus and method of performing wavelength conversion
FUJITSU LTD10 citations86
US9350479B2May 24, 2016
Apparatus and method for monitoring wavelength tunable optical filter
FUJITSU LTD7 citations84
US7702197B2Apr 20, 2010
SOA array optical module
FUJITSU LTD13 citations84
US7460744B2Dec 2, 2008
Ring type optical transmission system and optical apparatus connected to same
FUJITSU LTD11 citations84
US6394663B2May 28, 2002
Ferrule assembly and optical module
FUJITSU LTD11 citations82
US7657181B2Feb 2, 2010
Optical add/drop multiplexer and optical network system
FUJITSU LTD9 citations80
US11968033B2Apr 23, 2024
Optical transmission device, optical transmission system, and optical transmitting power control method
FUJITSU LTD4 citations74
US6985657B2Jan 10, 2006
Arrayed waveguide wavelength multiplexing apparatus and optical transmitter
FUJITSU LTD7 citations74
US6847772B2Jan 25, 2005
Planar optical waveguide device
FUJITSU LTD10 citations74
US6669378B2Dec 30, 2003
Ferrule assembly and optical module
FUJITSU LTD7 citations74
US11163119B2Nov 2, 2021
Wavelength conversion device and method of performing wavelength conversion
FUJITSU LTD2 citations73
US10797799B2Oct 6, 2020
Optical transmission apparatus, optical transmission system, and optical transmission method
FUJITSU LTD2 citations73
US10187172B2Jan 22, 2019
Optical transport apparatus and optical-wavelength defragmenting method
FUJITSU LTD3 citations73
US9705604B2Jul 11, 2017
Communication device and wavelength adjustment method
FUJITSU LTD2 citations73
US9143242B2Sep 22, 2015
Optical signal demodulator, optical signal demodulating method, and optical add-drop multiplexer
FUJITSU LTD4 citations73
US6038242AMar 14, 2000
Multiwavelength light source
FUJITSU LTD12 citations73
US9496953B2Nov 15, 2016
Device and method for monitoring optical signal quality, and optical transmission device
FUJITSU LTD2 citations63
US9444573B2Sep 13, 2016
Transmission device and optical transmission system
FUJITSU LTD2 citations63
US7826744B2Nov 2, 2010
Optical network system and transmission apparatus
FUJITSU LTD3 citations63
US7548669B2Jun 16, 2009
Optical gate array device
FUJITSU LTD5 citations63
US7406262B2Jul 29, 2008
Optical transmission device
FUJITSU LTD5 citations63
US7079728B2Jul 18, 2006
Wavelength multiplexing processing apparatus
FUJITSU LTD3 citations63
US6807354B2Oct 19, 2004
Waveguide optical device
FUJITSU LTD4 citations63
US6641308B2Nov 4, 2003
Ferrule assembly and optical module
FUJITSU LTD3 citations63
US10200132B2Feb 5, 2019
Optical communication system, transmission station, and method of optical communication
FUJITSU LTD1 citations62
US12586974B2Mar 24, 2026
Raman amplifier, Raman amplification method, and Raman amplification system
FUJITSU LTD0 citations53
US11387912B2Jul 12, 2022
Wavelength converter and fiber optic transmission system
FUJITSU LTD0 citations52
US10955727B2Mar 23, 2021
Wavelength converter and transmission apparatus
FUJITSU LTD0 citations52
US10268227B2Apr 23, 2019
Transmission apparatus, transmission system and data detection method
FUJITSU LTD0 citations52
US10158422B2Dec 18, 2018
Apparatus and method for estimating optical transmission performance
FUJITSU LTD0 citations52
US8014642B2Sep 6, 2011
Optical gate array device
FUJITSU LTD0 citations52
US6488415B2Dec 3, 2002
Ferrule assembly and optical module
FUJITSU LTD0 citations52
US11876559B2Jan 16, 2024
Optical transmission system and fiber type determination method
FUJITSU LTD0 citations51
US7405858B2Jul 29, 2008
Acousto-optic tunable filter control apparatus automatically adjusting frequency and power of radio frequency signal
FUJITSU LTD0 citations51
US10763986B2Sep 1, 2020
Transmission device, optical termination device, transmission system, and transmission method
FUJITSU LTD0 citations42
US10567082B2Feb 18, 2020
Optical terminal device, optical terminating device, and communication control method
FUJITSU LTD0 citations42
NAKAGAWA GOJI
4 patentsUS8654440B2Feb 18, 2014
Optical amplification module and optical switch device
NAKAGAWA GOJI7 citations82
US8437589B2May 7, 2013
Optical module
NAKAGAWA GOJI3 citations61
US8942567B2Jan 27, 2015
Optical receiving device and communication system
NAKAGAWA GOJI0 citations51
US8896914B2Nov 25, 2014
Optical amplifying device
NAKAGAWA GOJI0 citations51
(unassigned)
1 patentShowing the top 50 of 57 patents by PatentIndex Score.