Inventor
SHIMOMURA HIROFUMI
JP11 patents
Patents
11 patentsUS6657952B1Dec 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
US7280470B2Oct 9, 2007
Ring network for sharing protection resource by working communication paths
NEC CORP23 citations92
US6538779B1Mar 25, 2003
Optical signal monitoring method and apparatus
NEC CORP30 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
US7197246B2Mar 27, 2007
Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer
NEC CORP6 citations74
US6466344B2Oct 15, 2002
Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer
NEC CORP5 citations74
US6895183B2May 17, 2005
Optical add-drop multiplexer
NEC CORP9 citations73
US6424440B1Jul 23, 2002
Optical switch, optical amplifier and optical power controller as well as optical add-drop multiplexer
NEC CORP2 citations63
US6809846B2Oct 26, 2004
Optical switch and optical network
NEC CORP2 citations62