Inventor
SAKATA YASUTAKA
JP25 patents
⚠️ This page may combine multiple inventors who share the name “SAKATA YASUTAKA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
20 patentsUS5891748AApr 6, 1999
Semiconductor optical waveguide and method of fabricating the same
NEC CORP71 citations96
US6383829B1May 7, 2002
Optical semiconductor device and method of fabricating the same
NEC CORP17 citations92
US6167070ADec 26, 2000
Optical semiconductor device and method of fabricating the same
NEC CORP18 citations92
US6134368AOct 17, 2000
Optical semiconductor device with a current blocking structure and method for making the same
NEC CORP46 citations92
US6100543AAug 8, 2000
Electro-absorption type semiconductor optical modulator having a quantum well structure
NEC CORP24 citations92
US5847415ADec 8, 1998
Light emitting device having current blocking structure
NEC CORP18 citations92
US5770466AJun 23, 1998
Semiconductor optical integrated circuits and method for fabricating the same
NEC CORP32 citations92
US5678935AOct 21, 1997
Semiconductor optical waveguide and method of fabricating the same
NEC CORP28 citations92
US5565693AOct 15, 1996
Semiconductor optical integrated circuits
NEC CORP34 citations92
US5790580AAug 4, 1998
Semiconductor optical integrated device
NEC CORP34 citations91
US6399404B2Jun 4, 2002
Fabricating method of optical semiconductor device
NEC CORP16 citations84
US6707839B1Mar 16, 2004
Optical semiconductor device and process for producing the same
NEC CORP11 citations74
US6036771AMar 14, 2000
Method of manufacturing optical semiconductor device
NEC CORP7 citations74
US5580818ADec 3, 1996
Fabrication process for semiconductor optical device
NEC CORP12 citations74
US5284791AFeb 8, 1994
Method of making tunable semiconductor laser
NEC CORP16 citations74
US6391671B2May 21, 2002
Method of producing an optical semiconductor device having a waveguide layer buried in an InP current blocking layer
NEC CORP6 citations73
US6222867B1Apr 24, 2001
Optical semiconductor device having waveguide layers buried in an InP current blocking layer
NEC CORP9 citations73
US6350629B1Feb 26, 2002
Optical semiconductor device having active layer and carrier recombination layer different from each other
NEC CORP3 citations63
US5913107AJun 15, 1999
Photosemiconductor device and method of fabricating the same
NEC CORP5 citations63
US5756373AMay 26, 1998
Method for fabricating optical semiconductor device
NEC CORP6 citations63