Inventor
HENMI NAOYA
JP47 patents
Patents
47 patentsUS6373911B1Apr 16, 2002
Bit synchronization circuit
NEC CORP89 citations98
US6115517ASep 5, 2000
Optical communication network apparatus and optical switching network
NEC CORP92 citations98
US4805235AFeb 14, 1989
Optical transmitter comprising an optical frequency discriminator
NEC CORP144 citations98
US6657952B1Dec 2, 2003
Ring network for sharing protection resource by working communication paths
NEC CORP109 citations97
US6404525B1Jun 11, 2002
Optical add-drop multiplexer
NEC CORP73 citations96
US6137603AOct 24, 2000
Optical network, optical division and insertion node and recovery system from network failure
NEC CORP83 citations96
US5887039AMar 23, 1999
Data transmission system using specific pattern for synchronization
NEC CORP66 citations96
US5812290ASep 22, 1998
Optical switching unit and control method for same
NEC CORP92 citations96
US5757526AMay 26, 1998
Optical communication network and method for optically detecting a fault
NEC CORP54 citations96
US5227908AJul 13, 1993
Optical communication apparatus using intensity modulation
NEC CORP64 citations96
US6407834B1Jun 18, 2002
Optical wave network system and method of monitoring a network trouble
NEC CORP22 citations93
US6271949B1Aug 7, 2001
Optical communication system using wavelength-division multiplexed light
NEC CORP23 citations93
US6061156AMay 9, 2000
Optical transmission system
NEC CORP33 citations93
US5687013ANov 11, 1997
Optical communication system having loop-back function for informing congestion state of receiving node
NEC CORP27 citations93
US5687181ANov 11, 1997
Parallel data transmission unit using byte error correcting code
NEC CORP25 citations93
US5675428AOct 7, 1997
Optical communication apparatus
NEC CORP31 citations93
US7280470B2Oct 9, 2007
Ring network for sharing protection resource by working communication paths
NEC CORP23 citations92
US6957018B2Oct 18, 2005
Optical packet exchange system and optical switch
NEC CORP26 citations92
US6760552B1Jul 6, 2004
Optical receiving circuit and optical communication device
NEC CORP31 citations92
US6570687B2May 27, 2003
Optical packet exchange system and optical switch
NEC CORP13 citations92
US6538779B1Mar 25, 2003
Optical signal monitoring method and apparatus
NEC CORP30 citations92
US6441935B1Aug 27, 2002
Optical packet exchange system and optical switch
NEC CORP27 citations92
US6429955B1Aug 6, 2002
Optical network
NEC CORP22 citations92
US6400498B1Jun 4, 2002
Optical signal repeating and amplifying device and optical level adjusting device
NEC CORP29 citations92
US6347168B1Feb 12, 2002
Optical switch and optical switch system
NEC CORP21 citations92
US5905587AMay 18, 1999
Optical network device
NEC CORP22 citations92
US5675429AOct 7, 1997
Optical communication transmission system
NEC CORP22 citations92
US5457559AOct 10, 1995
Apparatus for extracting an optical clock and apparatus for demultiplexing a time-division multiplexed signal
NEC CORP50 citations92
US5392303AFeb 21, 1995
Frequency stabilization method of semiconductor laser, frequency-stabilized light source and laser module
NEC CORP47 citations92
US5325225AJun 28, 1994
Method of optical transmission and optical transmitter used in the same
NEC CORP33 citations92
US5184243AFeb 2, 1993
Optical transmitting apparatus for minimal dispersion along an optical fiber
NEC CORP39 citations92
US5506920AApr 9, 1996
Optical wavelength tunable filter
NEC CORP21 citations90
US6771907B1Aug 3, 2004
Optical ring system
NEC CORP24 citations89
US6445473B1Sep 3, 2002
Optical switching apparatus using wavelength division multiplexing technology
NEC CORP14 citations84
US6125104ASep 26, 2000
Network node for switching quality detector to incoming signal specified by request message from adjacent node
NEC CORP18 citations84
US7197246B2Mar 27, 2007
Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer
NEC CORP6 citations74
US6643042B1Nov 4, 2003
Optical communication network node
NEC CORP9 citations74
US6466344B2Oct 15, 2002
Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer
NEC CORP5 citations74
US6333800B1Dec 25, 2001
Optical communication system using wavelength-division multiplexed light
NEC CORP10 citations74
US4765738AAug 23, 1988
Method and apparatus of measuring frequency response in an optical receiving system
NEC CORP7 citations74
US6895183B2May 17, 2005
Optical add-drop multiplexer
NEC CORP9 citations73
USRE37621EApr 2, 2002
Optical communication transmission system
NEC CORP7 citations73
US6424440B1Jul 23, 2002
Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer
NEC CORP2 citations63
US6081557AJun 27, 2000
Datalink system and communication network
NEC CORP4 citations63
US6809846B2Oct 26, 2004
Optical switch and optical network
NEC CORP2 citations62
US7126950B2Oct 24, 2006
Method and system for transmission and reception of asynchronously multiplexed signals
NEC CORP3 citations59
US5812302ASep 22, 1998
High-speed frequency modulation signal source and high-speed variable optical wavelength filter
NEC CORP0 citations42