Inventor
CHIKAMA TERUMI
JP49 patents
⚠️ This page may combine multiple inventors who share the name “CHIKAMA TERUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJITSU LTD
48 patentsUS6055092AApr 25, 2000
Multi-wavelength light amplifier
FUJITSU LTD167 citations99
US6661974B1Dec 9, 2003
Optical transmitter and optical transmission system
FUJITSU LTD102 citations98
US6351323B1Feb 26, 2002
Optical transmission apparatus, optical transmission system, and optical terminal station
FUJITSU LTD87 citations98
US5737118AApr 7, 1998
Optical amplifying apparatus
FUJITSU LTD117 citations98
US6480329B2Nov 12, 2002
Multi-wavelength light amplifier
FUJITSU LTD38 citations96
US6369938B1Apr 9, 2002
Multi-wavelength light amplifier
FUJITSU LTD38 citations96
US6292289B1Sep 18, 2001
Method, device, and system for transmitting a supervisory optical signal
FUJITSU LTD53 citations96
US6285479B1Sep 4, 2001
Optical cross connect unit, optical add-drop multiplexer, light source unit, and adding unit
FUJITSU LTD66 citations96
US6278536B1Aug 21, 2001
Optical transmission device for bi-directional optical communication
FUJITSU LTD74 citations96
US5115332AMay 19, 1992
Receiver for coherent optical communication
FUJITSU LTD67 citations96
US4965858AOct 23, 1990
Polarization diversity optical receiver for coherent optical communication
FUJITSU LTD57 citations96
US6738181B1May 18, 2004
Optical sending apparatus and channel extension method
FUJITSU LTD28 citations93
US6542291B1Apr 1, 2003
Optical amplifier excitation light source control method for use in optical amplifier and optical amplifier control method
FUJITSU LTD17 citations93
US6507431B1Jan 14, 2003
Remotely pumping type multi-wavelength light transmission system
FUJITSU LTD22 citations93
US6366376B1Apr 2, 2002
Optical transmitting device using wavelength division multiplexing to transmit signal lights having frequencies arranged to eliminate effects of four-wave mixing (FWM)
FUJITSU LTD29 citations93
US6366379B1Apr 2, 2002
Remote control device of acousto-optic tunable filter and optical transmission system containing equalizer using acousto-optic tunable filter and optical transmission system containing optical add/drop multiplexer using acousto-optic tunable filter
FUJITSU LTD25 citations93
US5903385AMay 11, 1999
Remotely pumping type multi-wavelength light transmission system
FUJITSU LTD32 citations93
US5701195ADec 23, 1997
Light signal reception apparatus having an improved light surge eliminating function
FUJITSU LTD35 citations93
US5253097AOct 12, 1993
Demodulator and a polarization diversity receiver for coherent optical communication provided with the demodulator
FUJITSU LTD31 citations93
US7474459B2Jan 6, 2009
Multi-wavelength light amplifier
FUJITSU LTD12 citations92
US7224517B2May 29, 2007
Multi-wavelength light amplifier
FUJITSU LTD16 citations92
US6583900B2Jun 24, 2003
Optical transmission apparatus, optical transmission system, and optical terminal station
FUJITSU LTD27 citations92
US6538782B1Mar 25, 2003
Light branching/inserting apparatus and light branching apparatus using wavelength selection filter
FUJITSU LTD33 citations92
US6496300B2Dec 17, 2002
Optical amplifier
FUJITSU LTD20 citations92
US6400499B2Jun 4, 2002
Multi-wavelength light amplifier
FUJITSU LTD24 citations92
US6373623B1Apr 16, 2002
Optical amplifier for use in optical communications equipment
FUJITSU LTD39 citations92
US6344914B1Feb 5, 2002
Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier
FUJITSU LTD38 citations92
US6335823B2Jan 1, 2002
Optical amplifier for use in optical communications equipment
FUJITSU LTD25 citations92
US5875054AFeb 23, 1999
Bidirectional optical amplifier circuit
FUJITSU LTD41 citations92
US5729372AMar 17, 1998
Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system
FUJITSU LTD27 citations92
US5539566AJul 23, 1996
Optical transmission method and apparatus and optical amplification method and apparatus for optical communication system
FUJITSU LTD20 citations92
US5228043AJul 13, 1993
Direct modulation phase shift keying (dm-psk) transmission system
FUJITSU LTD24 citations92
US5052051ASep 24, 1991
Heterodyne receiver for coherent optical communication
FUJITSU LTD49 citations92
US5050176ASep 17, 1991
Direct modulation phase-shift-keying system and method
FUJITSU LTD35 citations92
US5003626AMar 26, 1991
Dual balanced optical signal receiver
FUJITSU LTD39 citations89
US7088922B2Aug 8, 2006
Wavelength division multiplexing optical communication system
FUJITSU LTD15 citations84
US6647211B2Nov 11, 2003
Remote control device of acousto-optic tunable filter and optical transmission system containing equalizer using acousto-optic tunable filter and optical transmission system containing optical add/drop multiplexer using acousto-optic tunable filter
FUJITSU LTD15 citations84
US6411411B1Jun 25, 2002
Optical wavelength selective control apparatus
FUJITSU LTD18 citations83
US6631026B2Oct 7, 2003
Optical amplifier, excitation light source control method for use in optical amplifier, and optical amplifier control method
FUJITSU LTD9 citations74
US6178037B1Jan 23, 2001
Optical amplifying apparatus
FUJITSU LTD7 citations74
US6807376B2Oct 19, 2004
Gain equalizer which includes a plurality of optical filters for equalizing the gain of an optical amplifier
FUJITSU LTD7 citations73
US8699126B2Apr 15, 2014
Multi-wavelength light amplifier
FUJITSU LTD2 citations63
US8004752B2Aug 23, 2011
Multi-wavelength light amplifier
FUJITSU LTD1 citations63
US7142785B2Nov 28, 2006
Light branching/inserting apparatus and light branching apparatus using wavelength selection filter
FUJITSU LTD4 citations63
US6873457B2Mar 29, 2005
Optical amplifier, excitation light source control method for use in optical amplifier, and optical amplifier control method
FUJITSU LTD2 citations63
US6545784B2Apr 8, 2003
Optical cross connect unit, optical add-drop multiplexer, light source unit, and adding unit
FUJITSU LTD4 citations63
US5568305AOct 22, 1996
Heterodyne receiver provided with a frequency discriminator for coherent lightwave communications
FUJITSU LTD7 citations63
US6891662B2May 10, 2005
Optical amplifier and method for amplifying wavelength multiplexed transmission signal light
FUJITSU LTD2 citations61