Inventor
ASAHI KOJI
JP23 patents
⚠️ This page may combine multiple inventors who share the name “ASAHI KOJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
18 patentsUS6222653B1Apr 24, 2001
Optical communication node and wavelength division multiplexing optical transmission device having ring structure comprising the optical communication nodes
NEC CORP83 citations97
US6195186B1Feb 27, 2001
Optical WDM ring network
NEC CORP95 citations97
US6023359AFeb 8, 2000
Optical wavelength-division multiplex transmission equipment with a ring structure
NEC CORP89 citations97
US6704508B1Mar 9, 2004
Optical crossconnect, optical network device, and connection status supervisory method
NEC CORP36 citations92
US6619867B1Sep 16, 2003
Optical transmission system
NEC CORP21 citations92
US6532089B1Mar 11, 2003
Optical cross-connect, method of switching over optical path, optical ADM, and optical cross-connect network system
NEC CORP40 citations92
US6337886B1Jan 8, 2002
Bit rate-selective type optical receiver, optical regenerative repeater and automatic bit rate discriminating method
NEC CORP48 citations92
US5563731AOct 8, 1996
Monitor control signal receiving apparatus for optical fiber amplifier
NEC CORP43 citations92
US6570685B1May 27, 2003
Node for optical communication and wavelength-division multiplexing transmission apparatus having a ring structure composed of the same nodes
NEC CORP48 citations91
US5786591AJul 28, 1998
Optical filter with transmission wavelength band controlling function and receiver using the optical filter
NEC CORP18 citations84
US11561118B2Jan 24, 2023
State specifying system, state specifying apparatus, state specifying method, and non-transitory computer readable medium
NEC CORP2 citations71
US6724953B2Apr 20, 2004
Optical cross-connect apparatus, and its signal monitoring method
NEC CORP5 citations62
US6034800AMar 7, 2000
NXN light matrix switch
NEC CORP5 citations62
US12094210B2Sep 17, 2024
Monitoring system, monitoring device, monitoring method, and non-transitory computer-readable medium
NEC CORP0 citations61
US11994417B2May 28, 2024
Utility pole deterioration detection system, utility pole deterioration detection apparatus, utility pole deterioration detection method, and non-transitory computer readable medium
NEC CORP0 citations61
US11747175B2Sep 5, 2023
Utility pole location specifying system, utility pole location specifying apparatus, utility pole location specifying method, and non-transitory computer readable medium
NEC CORP1 citations61
US7339723B2Mar 4, 2008
Optical transmission system, optical repeating apparatus, and quality supervising method
NEC CORP1 citations52
US12078769B2Sep 3, 2024
Monitoring system, monitoring device, monitoring method, and non-transitory computer-readable medium
NEC CORP0 citations50