Inventor
NAGANUMA NORIHISA
JP27 patents
⚠️ This page may combine multiple inventors who share the name “NAGANUMA NORIHISA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
23 patentsUS6515776B1Feb 4, 2003
Optical device, terminal unit, and system for wavelength division multiplexing
FUJITSU LTD26 citations92
US6370285B1Apr 9, 2002
Wavelength characteristic control device, gain equalizer, and light amplifier
FUJITSU LTD14 citations92
US6310717B1Oct 30, 2001
Optical amplifier and fiber module for optical amplification
FUJITSU LTD30 citations92
US6115178ASep 5, 2000
Optical device
FUJITSU LTD28 citations92
US5905827AMay 18, 1999
Optical multiplexer/demultiplexer and wavelength division multiplexing module
FUJITSU LTD44 citations92
US5812307ASep 22, 1998
Optical device and optical amplifier
FUJITSU LTD34 citations92
US5223975AJun 29, 1993
Polarization beam coupler including a splitter for producing an output monitor beam
FUJITSU LTD25 citations92
US6496619B2Dec 17, 2002
Method for gain equalization, and device and system for use in carrying out the method
FUJITSU LTD14 citations84
US6101025AAug 8, 2000
Optical repeater having redundancy
FUJITSU LTD19 citations84
US6452720B1Sep 17, 2002
Light source apparatus, optical amplifier and optical communication system
FUJITSU LTD13 citations74
US5801892ASep 1, 1998
Optical device having an optical film with an incident angle thereupon variable
FUJITSU LTD12 citations74
US5377040ADec 27, 1994
Polarization independent optical device
FUJITSU LTD10 citations74
US5125053AJun 23, 1992
Optical coupler ultizing prisms
FUJITSU LTD15 citations74
US5015055AMay 14, 1991
Polarization coupler
FUJITSU LTD10 citations74
US6993217B2Jan 31, 2006
Optical switch device
FUJITSU LTD7 citations73
US6829396B2Dec 7, 2004
Wavelength characteristic control device, gain equalizer, and light amplifier
FUJITSU LTD3 citations63
US6650797B2Nov 18, 2003
Wavelength characteristics control device, gain equalizer and light amplifier
FUJITSU LTD4 citations63
US5739951AApr 14, 1998
Polarization independent optical device
FUJITSU LTD5 citations63
US7209284B2Apr 24, 2007
Optical amplifier using reflection-type variable optical attenuator for feedback
FUJITSU LTD5 citations61
US6856455B2Feb 15, 2005
Light source apparatus, optical amplifier and optical communication system
FUJITSU LTD1 citations52
US6807335B2Oct 19, 2004
Wavelength characteristic variable apparatus
FUJITSU LTD0 citations52
US5796887AAug 18, 1998
Optical device for coupling and separating two light components
FUJITSU LTD1 citations52
US6829403B2Dec 7, 2004
Optical switch having an array of optical fibers with respective, removable disposed mirrors and a lens disposed away from an end surface of each corresponding optical fiber
FUJITSU LTD0 citations42