Inventor
KOSAKA JUNYA
JP42 patents
⚠️ This page may combine multiple inventors who share the name “KOSAKA JUNYA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
40 patentsUS6038062AMar 14, 2000
Optical amplifier, method of controlling the output light from the optical amplifier, optical transmission system and method of controlling an optical transmission path
HITACHI LTD110 citations99
US5675432AOct 7, 1997
Optical amplification apparatus
HITACHI LTD128 citations99
US6094296AJul 25, 2000
Optical amplification apparatus
HITACHI LTD74 citations97
US6229641B1May 8, 2001
Optical amplifier, method of controlling the output light from the optical amplifier, optical transmission system and method of controlling an optical transmission path cross reference to related application
HITACHI LTD69 citations96
US5986800ANov 16, 1999
Optical amplification apparatus
HITACHI LTD45 citations96
US5864423AJan 26, 1999
Optical amplifier, method of controlling the output light from the optical amplifier, optical transmission system and method of controlling an optical transmission path
HITACHI LTD34 citations96
US6195480B1Feb 27, 2001
Optical transmission device and optical transmission system employing the same
HITACHI LTD27 citations93
US6483630B2Nov 19, 2002
Optical amplifier, method of controlling the output light from the optical amplifier, optical transmission system and method of controlling an optical transmission path cross reference to related application
HITACHI LTD14 citations92
US6433925B1Aug 13, 2002
Optical fiber amplifier and optical transmission system using the same
HITACHI LTD41 citations92
US6233091B1May 15, 2001
Optical amplifier unit control methods, optical amplifier systems and systems which use the methods and amplifier systems
HITACHI LTD20 citations92
US6091539AJul 18, 2000
Optical amplifier apparatus and control method thereof, and optical transmission system using optical amplifier apparatus
HITACHI LTD30 citations92
US6078422AJun 20, 2000
Optical amplifier unit control methods optical amplifier systems and systems which use the methods and amplifier systems
HITACHI LTD29 citations92
US6373622B1Apr 16, 2002
Optical amplification apparatus
HITACHI LTD9 citations82
US6256141B1Jul 3, 2001
Optical amplification apparatus
HITACHI LTD13 citations82
US6674938B2Jan 6, 2004
Optical amplifier, optical transmission equipment, optical transmission system, and method thereof
HITACHI LTD4 citations74
US6671084B2Dec 30, 2003
Optical amplifier
HITACHI LTD7 citations74
US6580550B1Jun 17, 2003
Filter with variable transmission character, optical transmission equipment and method of optical transmission
HITACHI LTD12 citations74
US6577438B2Jun 10, 2003
Method and apparatus for monitoring and controlling gain tilt in an optical amplifier
HITACHI LTD7 citations74
US6525871B2Feb 25, 2003
Optical amplification apparatus
HITACHI LTD6 citations74
US6490387B2Dec 3, 2002
Optical transmission device and optical transmission system employing the same
HITACHI LTD10 citations74
US6459527B1Oct 1, 2002
Optical amplifier apparatus and control method thereof, and optical transmission system using optical amplifier apparatus
HITACHI LTD11 citations74
US6400475B1Jun 4, 2002
Optical transmission system and optical communications device
HITACHI LTD12 citations74
US6321002B1Nov 20, 2001
Optical amplifier, optical transmission equipment, optical transmission system, and method thereof
HITACHI LTD10 citations74
US6314217B1Nov 6, 2001
Optical transmission device and optical transmission system employing the same
HITACHI LTD10 citations74
US6297902B1Oct 2, 2001
Light amplification medium control method, light amplification apparatus and system using the same
HITACHI LTD10 citations74
US6262835B1Jul 17, 2001
Optical amplifier unit control methods, optical amplifier systems and systems which use the methods and amplifier systems
HITACHI LTD11 citations74
US6229936B1May 8, 2001
Optical amplifier, optical transmission equipment, optical transmission system, and method thereof
HITACHI LTD12 citations74
US5943162AAug 24, 1999
Optical amplifier, optical amplifying method and optical transmission system using the optical amplifier
HITACHI LTD11 citations74
US5835260ANov 10, 1998
Optical amplifier, optical amplifying method and optical transmission system using the optical amplifier
HITACHI LTD9 citations74
US6532103B1Mar 11, 2003
Optical fiber amplifier and optical transmission system using the same
HITACHI LTD11 citations73
US6771854B2Aug 3, 2004
Optical transmission system and optical coupler/branching filter
HITACHI LTD11 citations72
US6563978B2May 13, 2003
Optical transmission system and optical coupler/branching filter
HITACHI LTD8 citations72
US6859308B2Feb 22, 2005
Optical amplifier
HITACHI LTD1 citations63
US6839164B2Jan 4, 2005
Optical transmission equipment and supervisory system thereof
HITACHI LTD6 citations63
US6836587B2Dec 28, 2004
Optical transmission device and optical transmission system employing the same
HITACHI LTD3 citations63
US6671431B2Dec 30, 2003
Optical transmission device and optical transmission system employing the same
HITACHI LTD2 citations63
US6496617B2Dec 17, 2002
Optical amplifier, optical transmission equipment, optical transmission system, and method thereof
HITACHI LTD3 citations63
US6867909B2Mar 15, 2005
Filter with variable transmission character, optical transmission equipment and method of optical transmission
HITACHI LTD0 citations52
US6839161B2Jan 4, 2005
Optical amplification apparatus
HITACHI LTD0 citations52
US6829408B2Dec 7, 2004
Optical amplifier, optical transmission equipment, optical transmission system, and method thereof
HITACHI LTD0 citations52