Inventor
YONEYAMA KENICHI
JP25 patents
⚠️ This page may combine multiple inventors who share the name “YONEYAMA KENICHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
14 patentsUS5801860ASep 1, 1998
Wavelength division multiplexing transmission system comprising a feedback section for transmitting a light power level signal from a light receiver to a light transmitter
NEC CORP77 citations96
US5535037AJul 9, 1996
Optical repeater
NEC CORP71 citations96
US6301404B1Oct 9, 2001
Supervisory signal optical bypass circuit, optical amplifying repeater and supervisory system
NEC CORP38 citations92
US6226090B1May 1, 2001
Light timing pulses generating method and light timing circuit
NEC CORP21 citations92
US6064514AMay 16, 2000
Optical surge preventing method and system for use with or in a rare earth doped fiber circuit
NEC CORP25 citations92
US5657154AAug 12, 1997
Monitoring system for all optical regenerators
NEC CORP22 citations92
US5894247AApr 13, 1999
Optical PLL circuit and method of controlling the same
NEC CORP48 citations89
US6603587B1Aug 5, 2003
Optical amplifier repeater
NEC CORP15 citations84
US6337936B1Jan 8, 2002
Optical amplifier, and method and apparatus for monitoring an optical fiber transmission path
NEC CORP10 citations74
US5801877ASep 1, 1998
Optical fiber amplifier for superimposing a sub-signal
NEC CORP9 citations74
US5764396AJun 9, 1998
Optical regenerative circuit
NEC CORP11 citations74
US5299055AMar 29, 1994
Optical fiber amplifier circuit comprising a control circuit for controlling a plurality of excitation light sources
NEC CORP18 citations74
US5295015AMar 15, 1994
Optical amplifying apparatus
NEC CORP18 citations74
US6600595B2Jul 29, 2003
Multi-stage optical amplifier apparatus having fiber grating with a cutoff wavelength less than the pump light wavelength
NEC CORP6 citations62