Inventor
YOKOYAMA RYU
JP10 patents
⚠️ This page may combine multiple inventors who share the name “YOKOYAMA RYU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
9 patentsUS6603587B1Aug 5, 2003
Optical amplifier repeater
NEC CORP15 citations84
US7123405B2Oct 17, 2006
Optical amplifying and relaying system
NEC CORP13 citations83
US6868204B2Mar 15, 2005
Optical amplifying and relaying system
NEC CORP7 citations72
US6704134B2Mar 9, 2004
Optical amplifier, optical amplifying repeater and transmission apparatus of wavelength division multiplexed signal light using the same
NEC CORP9 citations72
US6504637B1Jan 7, 2003
Optical regeneration circuit for regenerating signal with deteriorated signal to noise ratio by means of saturable absorption element
NEC CORP6 citations62
US7688501B2Mar 30, 2010
Optical transmission system and optical amplification method used in the system
NEC CORP2 citations61
US6845192B2Jan 18, 2005
Optical amplifying and relaying system
NEC CORP1 citations61
US6658211B1Dec 2, 2003
Optical signal repeater and output level control method used in this repeater
NEC CORP5 citations61
US7894127B2Feb 22, 2011
Optical transmission system and optical amplification method used in the system
NEC CORP1 citations50