Inventor
YAMADA HIROHITO
JP22 patents
⚠️ This page may combine multiple inventors who share the name “YAMADA HIROHITO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NEC CORP
18 patentsUS6363097B1Mar 26, 2002
Semiconductor laser with a rewritable wavelength stabilizer
NEC CORP85 citations97
US6631236B2Oct 7, 2003
Photonic crystal waveguide and directional coupler using the same
NEC CORP25 citations92
US6416575B2Jul 9, 2002
Photonic crystal multilayer substrate and manufacturing method thereof
NEC CORP38 citations92
US5887012AMar 23, 1999
Semiconductor laser array
NEC CORP19 citations92
US5394429AFeb 28, 1995
Distributed-feedback laser with improved analog modulation distortion characteristics and method for fabricating the same
NEC CORP32 citations92
US8374469B2Feb 12, 2013
Optical waveguide
NEC CORP6 citations73
US7376317B2May 20, 2008
Waveguide structure and method of manufacturing the same
NEC CORP8 citations73
US7359606B2Apr 15, 2008
Photonic crystal optical circuit and method for controlling the same
NEC CORP5 citations73
US5828058AOct 27, 1998
Optical fiber remote sensing system with electromagnetic wave measurement
NEC CORP10 citations73
US5693965ADec 2, 1997
Laser diode having narrowed radiation angle characteristic
NEC CORP11 citations73
US5661580AAug 26, 1997
SCM type of optical signal transmission system without clipping distortion
NEC CORP11 citations73
US5568505AOct 22, 1996
Laser diode element with excellent intermodulation distortion characteristic
NEC CORP10 citations73
US5511089AApr 23, 1996
Semiconductor laser element with excellent high-temperature characteristic and capable of being readily mounted on an optical circuit board
NEC CORP14 citations73
US5469459ANov 21, 1995
Laser diode element with excellent intermodulation distortion characteristic
NEC CORP8 citations73
US7715665B2May 11, 2010
Photonic crystal optical circuit and method for controlling the same
NEC CORP4 citations62
US7286738B2Oct 23, 2007
White light pulse generating method using nonlinear optical device
NEC CORP4 citations62
US5553090ASep 3, 1996
Semiconductor multiquantum well structure and semiconductor laser therewith
NEC CORP3 citations62
US6541951B2Apr 1, 2003
Optical measurement of target-light waveform
NEC CORP3 citations61