Inventor
FUKUSHIMA NOBUHIRO
JP59 patents
⚠️ This page may combine multiple inventors who share the name “FUKUSHIMA NOBUHIRO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
49 patentsUS5696859ADec 9, 1997
Optical-filter array, optical transmitter and optical transmission system
FUJITSU LTD108 citations98
US6339492B1Jan 15, 2002
Tunable optical filter
FUJITSU LTD61 citations96
US5973821AOct 26, 1999
Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of light signal
FUJITSU LTD50 citations96
US5889609AMar 30, 1999
Optical attenuator
FUJITSU LTD64 citations96
US5867300AFeb 2, 1999
Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of a light signal
FUJITSU LTD79 citations96
US5805759ASep 8, 1998
Optical equalizer having variable transmittance versus wavelength characteristics for attenuating light
FUJITSU LTD74 citations96
US5692082ANov 25, 1997
Laser diode module and depolarizer
FUJITSU LTD59 citations96
US5646399AJul 8, 1997
Tunable optical filter having beam splitter and movable film filter
FUJITSU LTD60 citations96
US6507422B1Jan 14, 2003
Optical attenuator and system, optical amplifier, and terminal device each having the optical attenuator
FUJITSU LTD26 citations93
US6407836B1Jun 18, 2002
Optical attenuator and system, optical amplifier, and terminal device each having the optical attenuator
FUJITSU LTD20 citations93
US6333806B1Dec 25, 2001
Variable optical attenuator which applies a magnetic field to a Faraday element to rotate the polarization of a light signal
FUJITSU LTD27 citations93
US6246818B1Jun 12, 2001
Tunable optical filter
FUJITSU LTD43 citations93
US6048102AApr 11, 2000
Optical connector which provides a disconnection state between two optical fibers where light is totally reflected at an end face of one fiber
FUJITSU LTD33 citations93
US6018411AJan 25, 2000
Optical device utilizing magneto-optical effect
FUJITSU LTD28 citations93
US6018412AJan 25, 2000
Optical attenuator
FUJITSU LTD34 citations93
US5896201AApr 20, 1999
Optical device for wavelength monitoring and wavelength control
FUJITSU LTD20 citations93
US5844710ADec 1, 1998
Faraday rotator and optical device employing the same
FUJITSU LTD41 citations93
US5812304ASep 22, 1998
Faraday rotator which generates a uniform magnetic field in a magnetic optical element
FUJITSU LTD51 citations93
US5745283AApr 28, 1998
Method and apparatus for controlling optical amplifier used for optically amplifying wavelength-division multiplexed signal
FUJITSU LTD49 citations93
US5625494AApr 29, 1997
Optical band-pass filter having two pass bands
FUJITSU LTD25 citations93
US5579420ANov 26, 1996
Optical filter
FUJITSU LTD42 citations93
US5537244AJul 16, 1996
Light amplifier
FUJITSU LTD31 citations93
US5402509AMar 28, 1995
Optical fiber coupling device including lenses and magnetooptics
FUJITSU LTD47 citations93
US7330617B2Feb 12, 2008
Wavelength selective optical switch, and optical device provided with spectroscopic function
FUJITSU LTD30 citations92
US5905827AMay 18, 1999
Optical multiplexer/demultiplexer and wavelength division multiplexing module
FUJITSU LTD44 citations92
US5291571AMar 1, 1994
Duplicated light source module
FUJITSU LTD50 citations91
US7171084B2Jan 30, 2007
Optical apparatus provided with demultiplexing function
FUJITSU LTD15 citations83
US6493129B2Dec 10, 2002
Tunable optical filter
FUJITSU LTD13 citations82
US7340128B2Mar 4, 2008
Wavelength selection device
FUJITSU LTD8 citations74
US6717713B2Apr 6, 2004
Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of a light signal
FUJITSU LTD8 citations74
US6717730B2Apr 6, 2004
Tunable optical filter
FUJITSU LTD5 citations74
US6570699B2May 27, 2003
Variable optical attenuator which applies a magnetic field to a Faraday element to rotate the polarization of a light signal
FUJITSU LTD7 citations74
US6334924B1Jan 1, 2002
Method of manufacturing optical filter
FUJITSU LTD10 citations74
US6275323B1Aug 14, 2001
Optical attenuator
FUJITSU LTD10 citations74
US5999313ADec 7, 1999
Optical device having function of optical circulator
FUJITSU LTD15 citations74
US5999305ADec 7, 1999
Optical device which makes use of magneto-optical effect
FUJITSU LTD11 citations74
US5822124AOct 13, 1998
Beam splitter
FUJITSU LTD8 citations74
US5801892ASep 1, 1998
Optical device having an optical film with an incident angle thereupon variable
FUJITSU LTD12 citations74
US5699187ADec 16, 1997
Optical coupler
FUJITSU LTD11 citations74
US5661602AAug 26, 1997
Beam splitter
FUJITSU LTD8 citations74
US4955006ASep 4, 1990
Floating type magneto-optic disk reading head system having external semiconductor laser resonator operating at orthogonal two mode oscillations
FUJITSU LTD15 citations74
US5812707ASep 22, 1998
Polarizer housing device for connecting a polarizer to an optical waveguide
FUJITSU LTD9 citations73
US6384957B1May 7, 2002
Variable optical attenuator utilizing Faraday effect
FUJITSU LTD8 citations71
US6392784B1May 21, 2002
Faraday rotator
FUJITSU LTD13 citations68
US7792436B2Sep 7, 2010
Optical receiver corresponding to differential M-phase shift keying system
FUJITSU LTD5 citations63
US6666944B2Dec 23, 2003
Method of manufacturing optical filter
FUJITSU LTD2 citations63
US5781347AJul 14, 1998
Optical device
FUJITSU LTD5 citations63
US5771118AJun 23, 1998
Beam splitter
FUJITSU LTD1 citations63
US5745290AApr 28, 1998
Beam splitter
FUJITSU LTD1 citations63
FDK CORP
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