Inventor
UTAKA KATSUYUKI
JP39 patents
⚠️ This page may combine multiple inventors who share the name “UTAKA KATSUYUKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
KOKUSAI DENSHIN DENWA CO LTD
38 patentsUS4720835AJan 19, 1988
Integrated semiconductor light emitting element with oscillation wavelength and phase modulated light output
KOKUSAI DENSHIN DENWA CO LTD156 citations98
US5315422AMay 24, 1994
Optical Mach-Zehnder type logic element which performs an XOR operation
KOKUSAI DENSHIN DENWA CO LTD76 citations96
US4894818AJan 16, 1990
Optical packet switching system using multi-stage combination of light triggering switches
KOKUSAI DENSHIN DENWA CO LTD79 citations96
US4660934AApr 28, 1987
Method for manufacturing diffraction grating
KOKUSAI DENSHIN DENWA CO LTD54 citations96
US5019519AMay 28, 1991
Method for the manufacture of optical semiconductor device
KOKUSAI DENSHIN DENWA CO LTD27 citations93
US4874216AOct 17, 1989
Variable-waveguide optical branching filter
KOKUSAI DENSHIN DENWA CO LTD38 citations93
US4805975AFeb 21, 1989
Optical waveguide switch
KOKUSAI DENSHIN DENWA CO LTD28 citations93
US4682196AJul 21, 1987
Multi-layered semi-conductor photodetector
KOKUSAI DENSHIN DENWA CO LTD39 citations93
US4653058AMar 24, 1987
Distributed feedback semiconductor laser with monitor
KOKUSAI DENSHIN DENWA CO LTD35 citations93
US4573161AFeb 25, 1986
Semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD29 citations93
US6084997AJul 4, 2000
Coupled waveguide structure
KOKUSAI DENSHIN DENWA CO LTD20 citations92
US5208822AMay 4, 1993
Semiconductor element having opposite signs of α parameter
KOKUSAI DENSHIN DENWA CO LTD51 citations92
US4829535AMay 9, 1989
Variable wavelength semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD26 citations92
US5122844AJun 16, 1992
Quantum well structure and semiconductor device using the same
KOKUSAI DENSHIN DENWA CO LTD20 citations82
US4743087AMay 10, 1988
Optical external modulation semiconductor element
KOKUSAI DENSHIN DENWA CO LTD21 citations82
US4731641AMar 15, 1988
Avalanche photo diode with quantum well layer
KOKUSAI DENSHIN DENWA CO LTD19 citations82
US4573158AFeb 25, 1986
Distributed feedback semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD21 citations82
US5187717AFeb 16, 1993
Tunable semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD20 citations81
US4918496AApr 17, 1990
Infrared emitting device with dislocation free layer
KOKUSAI DENSHIN DENWA CO LTD17 citations74
US4913506AApr 3, 1990
Optical modulation device
KOKUSAI DENSHIN DENWA CO LTD16 citations74
US4852108AJul 25, 1989
Wavelength tunable semiconductor laser with narrow band-pass active filter region
KOKUSAI DENSHIN DENWA CO LTD19 citations74
US4826291AMay 2, 1989
Method for manufacturing diffraction grating
KOKUSAI DENSHIN DENWA CO LTD7 citations74
US4815090AMar 21, 1989
Distributed feedback semiconductor laser with monitor
KOKUSAI DENSHIN DENWA CO LTD17 citations74
US4795225AJan 3, 1989
Semiconductor optical switch
KOKUSAI DENSHIN DENWA CO LTD18 citations74
US4701930AOct 20, 1987
Distributed feedback semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD16 citations74
US4665527AMay 12, 1987
Distributed feedback semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD10 citations74
US4653059AMar 24, 1987
Distributed feedback semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD12 citations74
US4648096AMar 3, 1987
Distributed feedback semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD9 citations74
US4633474ADec 30, 1986
Distributed feedback semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD9 citations74
US4553239ANov 12, 1985
Distributed feedback semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD10 citations74
US4516243AMay 7, 1985
Distributed feedback semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD9 citations74
US5952683ASep 14, 1999
Functional semiconductor element with avalanche multiplication
KOKUSAI DENSHIN DENWA CO LTD16 citations72
US5663572ASep 2, 1997
Optical functional semiconductor element
KOKUSAI DENSHIN DENWA CO LTD8 citations72
US4946243AAug 7, 1990
Optical modulation element
KOKUSAI DENSHIN DENWA CO LTD3 citations63
US4923265AMay 8, 1990
Light triggering switch
KOKUSAI DENSHIN DENWA CO LTD2 citations63
US4897845AJan 30, 1990
Semiconductor optical amplifying element
KOKUSAI DENSHIN DENWA CO LTD3 citations63
US4589117AMay 13, 1986
Butt-jointed built-in semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD3 citations63
US4506367AMar 19, 1985
Distributed feedback semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD4 citations63