Inventor · disambiguated record
Nobuhiro Fukushima
Also filed as: FUKUSHIMA NOBUHIRO
59 granted patents·3 pending applications·1,419 citations·filing 1989–2010
99Inventor score
Top patents by PatentIndex Score
62 records- 0192US5867300AVariable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of a light signalFUJITSU LTD·Filed 1997·Granted Feb 2, 1999·79 cites·60 claims
- 0291US7330617B2Wavelength selective optical switch, and optical device provided with spectroscopic functionFUJITSU LTD·Filed 2005·Granted Feb 12, 2008·30 cites·23 claims
- 0391US5696859AOptical-filter array, optical transmitter and optical transmission systemFUJITSU LTD·Filed 1995·Granted Dec 9, 1997·108 cites·12 claims
- 0487US5973821AVariable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of light signalFUJITSU LTD·Filed 1998·Granted Oct 26, 1999·50 cites·9 claims
- 0586US6507422B1Optical attenuator and system, optical amplifier, and terminal device each having the optical attenuatorFUJITSU LTD·Filed 2000·Granted Jan 14, 2003·26 cites·31 claims
- 0686US5805759AOptical equalizer having variable transmittance versus wavelength characteristics for attenuating lightFUJITSU LTD·Filed 1997·Granted Sep 8, 1998·74 cites·58 claims
- 0785US6339492B1Tunable optical filterFUJITSU LTD·Filed 1998·Granted Jan 15, 2002·61 cites·57 claims
- 0885US5889609AOptical attenuatorFUJITSU LTD·Filed 1997·Granted Mar 30, 1999·64 cites·39 claims
- 0984US7171084B2Optical apparatus provided with demultiplexing functionFUJITSU LTD·Filed 2005·Granted Jan 30, 2007·15 cites·11 claims
- 1082US5692082ALaser diode module and depolarizerFUJITSU LTD·Filed 1995·Granted Nov 25, 1997·59 cites·7 claims
- 1182US5646399ATunable optical filter having beam splitter and movable film filterFUJITSU LTD·Filed 1996·Granted Jul 8, 1997·60 cites·15 claims
- 1278US5291571ADuplicated light source moduleFUJITSU LTD·Filed 1993·Granted Mar 1, 1994·50 cites·16 claims
- 1377US6493129B2Tunable optical filterFUJITSU LTD·Filed 2001·Granted Dec 10, 2002·13 cites·28 claims
- 1477US6246818B1Tunable optical filterFUJITSU LTD·Filed 1999·Granted Jun 12, 2001·43 cites·20 claims
- 1577US5402509AOptical fiber coupling device including lenses and magnetoopticsFUJITSU LTD·Filed 1992·Granted Mar 28, 1995·47 cites·9 claims
- 1676US7340128B2Wavelength selection deviceFUJITSU LTD·Filed 2006·Granted Mar 4, 2008·8 cites·8 claims
- 1776US5812304AFaraday rotator which generates a uniform magnetic field in a magnetic optical elementFUJITSU LTD·Filed 1996·Granted Sep 22, 1998·51 cites·52 claims
- 1875US6333806B1Variable optical attenuator which applies a magnetic field to a Faraday element to rotate the polarization of a light signalFUJITSU LTD·Filed 1998·Granted Dec 25, 2001·27 cites·13 claims
- 1975US5905827AOptical multiplexer/demultiplexer and wavelength division multiplexing moduleFUJITSU LTD·Filed 1997·Granted May 18, 1999·44 cites·11 claims
- 2075US5745283AMethod and apparatus for controlling optical amplifier used for optically amplifying wavelength-division multiplexed signalFUJITSU LTD·Filed 1996·Granted Apr 28, 1998·49 cites·26 claims
- 2174US5579420AOptical filterFUJITSU LTD·Filed 1996·Granted Nov 26, 1996·42 cites·19 claims
- 2273US7792436B2Optical receiver corresponding to differential M-phase shift keying systemFUJITSU LTD·Filed 2006·Granted Sep 7, 2010·5 cites·15 claims
- 2373US6018412AOptical attenuatorFUJITSU LTD·Filed 1998·Granted Jan 25, 2000·34 cites·31 claims
- 2472US6717713B2Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of a light signalFUJITSU LTD·Filed 2003·Granted Apr 6, 2004·8 cites·1 claims
- 2571US5844710AFaraday rotator and optical device employing the sameFUJITSU LTD·Filed 1997·Granted Dec 1, 1998·41 cites·11 claims
- 2669US6570699B2Variable optical attenuator which applies a magnetic field to a Faraday element to rotate the polarization of a light signalFUJITSU LTD·Filed 2001·Granted May 27, 2003·7 cites·6 claims
- 2769US6048102AOptical connector which provides a disconnection state between two optical fibers where light is totally reflected at an end face of one fiberFUJITSU LTD·Filed 1996·Granted Apr 11, 2000·33 cites·24 claims
- 2868US4955006AFloating type magneto-optic disk reading head system having external semiconductor laser resonator operating at orthogonal two mode oscillationsFUJITSU LTD·Filed 1989·Granted Sep 4, 1990·15 cites·14 claims
- 2967US5537244ALight amplifierFUJITSU LTD·Filed 1995·Granted Jul 16, 1996·31 cites·17 claims
- 3066US7535616B2Polarization controlling apparatus and polarization operation apparatusFUJITSU LTD·Filed 2006·Granted May 19, 2009·2 cites·17 claims
- 3166US6392784B1Faraday rotatorFUJITSU LTD·Filed 2000·Granted May 21, 2002·13 cites·17 claims
- 3264US8711359B2Delay interferometer using magneto-optic effect of a variable faraday rotatorFUKUSHIMA NOBUHIRO·Filed 2010·Granted Apr 29, 2014·1 cites·10 claims
- 3362US8331744B2Optical switchFURUKAWA HIROYUKI·Filed 2007·Granted Dec 11, 2012·3 cites·15 claims
- 3462US6717730B2Tunable optical filterFUJITSU LTD·Filed 2002·Granted Apr 6, 2004·5 cites·20 claims
- 3562US6018411AOptical device utilizing magneto-optical effectFUJITSU LTD·Filed 1997·Granted Jan 25, 2000·28 cites·42 claims
- 3661US5625494AOptical band-pass filter having two pass bandsFUJITSU LTD·Filed 1995·Granted Apr 29, 1997·25 cites·4 claims
- 3760US6384957B1Variable optical attenuator utilizing Faraday effectFUJITSU LTD·Filed 2000·Granted May 7, 2002·8 cites·10 claims
- 3858US6407836B1Optical attenuator and system, optical amplifier, and terminal device each having the optical attenuatorFUJITSU LTD·Filed 1998·Granted Jun 18, 2002·20 cites·36 claims
- 3955US5896201AOptical device for wavelength monitoring and wavelength controlFUJITSU LTD·Filed 1998·Granted Apr 20, 1999·20 cites·20 claims
- 4050US5999313AOptical device having function of optical circulatorFUJITSU LTD·Filed 1997·Granted Dec 7, 1999·15 cites·12 claims
- 4149US6334924B1Method of manufacturing optical filterFUJITSU LTD·Filed 1998·Granted Jan 1, 2002·10 cites·6 claims
- 4248US6666944B2Method of manufacturing optical filterFUJITSU LTD·Filed 2001·Granted Dec 23, 2003·2 cites·4 claims
- 4348US6275323B1Optical attenuatorFUJITSU LTD·Filed 1998·Granted Aug 14, 2001·10 cites·50 claims
- 4447US5822124ABeam splitterFUJITSU LTD·Filed 1997·Granted Oct 13, 1998·8 cites·8 claims
- 4547US5801892AOptical device having an optical film with an incident angle thereupon variableFUJITSU LTD·Filed 1996·Granted Sep 1, 1998·12 cites·37 claims
- 4647US5661602ABeam splitterFUJITSU LTD·Filed 1995·Granted Aug 26, 1997·8 cites·2 claims
- 4745US5699187AOptical couplerFUJITSU LTD·Filed 1993·Granted Dec 16, 1997·11 cites·14 claims
- 4844US5999305AOptical device which makes use of magneto-optical effectFUJITSU LTD·Filed 1998·Granted Dec 7, 1999·11 cites·25 claims
- 4944US2008107874A1Optical element including dielectric multilayer film and manufacturing method thereofFUJITSU LTD·Filed 2007·Application pending·0 cites
- 5044US2010284076A1Wavelength dispersion compensation deviceFUJITSU LTD·Filed 2007·Application pending·0 cites
Showing the top 50 of 62 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when Nobuhiro Fukushima files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →