Inventor
TAJIMA TSUTOMU
JP17 patents
⚠️ This page may combine multiple inventors who share the name “TAJIMA TSUTOMU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
11 patentsUS6081359AJun 27, 2000
Transmitting apparatus and receiving apparatus for wavelength-division-multiplex signal transmission
NEC CORP73 citations92
US5726794AMar 10, 1998
DC bias controller for optical modulator
NEC CORP21 citations92
US5367397ANov 22, 1994
Wavelength-stabilizing method and its associated circuitry for an optical communication system
NEC CORP28 citations92
US4864649ASep 5, 1989
Driver circuit for driving a light emitting element by superimposing an analog sub-information signal over a digital main signal
NEC CORP53 citations87
US5926304AJul 20, 1999
Optical fiber amp repeater of amplifying an optical signal and superimposing an auxiliary signal
NEC CORP18 citations83
US6522675B1Feb 18, 2003
Wavelength control circuit and wavelength control method of light emitting device
NEC CORP7 citations73
US6420962B1Jul 16, 2002
Automatic identification level control circuit, identification level control method, automatic identification phase control circuit, identification phase control method, optical receiver, and optical communication system
NEC CORP7 citations71
US6055093AApr 25, 2000
Optical amplifying apparatus and linear relay optical amplifier transmitter
NEC CORP10 citations71
US5995276ANov 30, 1999
Wavelength-division-multiplexing optical amplifier device and wavelength-division-multiplexing optical transmission system
NEC CORP8 citations71
US5768000AJun 16, 1998
Wavelength multiplexing optical transmission device
NEC CORP5 citations62
US7920559B2Apr 5, 2011
Transponder, transmission system, transmission method and transmission program
NEC CORP6 citations56