Inventor
MATSUSHIMA YUICHI
JP48 patents
⚠️ This page may combine multiple inventors who share the name “MATSUSHIMA YUICHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
KOKUSAI DENSHIN DENWA CO LTD
43 patentsUS5434693AJul 18, 1995
Optical short pulse generating device
KOKUSAI DENSHIN DENWA CO LTD141 citations98
US5315422AMay 24, 1994
Optical Mach-Zehnder type logic element which performs an XOR operation
KOKUSAI DENSHIN DENWA CO LTD76 citations96
US4660934AApr 28, 1987
Method for manufacturing diffraction grating
KOKUSAI DENSHIN DENWA CO LTD54 citations96
US5798856AAug 25, 1998
Optical pulse generator
KOKUSAI DENSHIN DENWA CO LTD27 citations93
US5401957AMar 28, 1995
Optical waveform shaping device for peforming waveform equalization and timing synchronization
KOKUSAI DENSHIN DENWA CO LTD25 citations93
US5394260AFeb 28, 1995
Optical pulse generator
KOKUSAI DENSHIN DENWA CO LTD31 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
US5859941AJan 12, 1999
Optical add/drop multiplexer device
KOKUSAI DENSHIN DENWA CO LTD25 citations92
US5392306AFeb 21, 1995
Multiple quantum well structure and semiconductor device using the same
KOKUSAI DENSHIN DENWA CO LTD33 citations92
US5306924AApr 26, 1994
Semiconductor device with strained-layer superlattice
KOKUSAI DENSHIN DENWA CO LTD34 citations92
US4932034AJun 5, 1990
Distributed feedback semiconductor laser device and current injection
KOKUSAI DENSHIN DENWA CO LTD32 citations92
US5122844AJun 16, 1992
Quantum well structure and semiconductor device using the same
KOKUSAI DENSHIN DENWA CO LTD20 citations82
US4731641AMar 15, 1988
Avalanche photo diode with quantum well layer
KOKUSAI DENSHIN DENWA CO LTD19 citations82
US5187717AFeb 16, 1993
Tunable semiconductor laser
KOKUSAI DENSHIN DENWA CO LTD20 citations81
US5359679AOct 25, 1994
Optical modulator
KOKUSAI DENSHIN DENWA CO LTD16 citations74
US5132747AJul 21, 1992
Avalanche photo diode
KOKUSAI DENSHIN DENWA CO LTD11 citations74
US4991921AFeb 12, 1991
Pn junction optical modulating device having a buffer layer with small energy gap
KOKUSAI DENSHIN DENWA CO LTD8 citations74
US4918496AApr 17, 1990
Infrared emitting device with dislocation free layer
KOKUSAI DENSHIN DENWA CO LTD17 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
US4761383AAug 2, 1988
Method of manufacturing avalanche photo diode
KOKUSAI DENSHIN DENWA CO LTD11 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
US4383266AMay 10, 1983
Avalanche photo diode
KOKUSAI DENSHIN DENWA CO LTD9 citations74
US5952683ASep 14, 1999
Functional semiconductor element with avalanche multiplication
KOKUSAI DENSHIN DENWA CO LTD16 citations72
US5805327ASep 8, 1998
Reshaping device for optical short pulses
KOKUSAI DENSHIN DENWA CO LTD13 citations72
US5663572ASep 2, 1997
Optical functional semiconductor element
KOKUSAI DENSHIN DENWA CO LTD8 citations72
US4897845AJan 30, 1990
Semiconductor optical amplifying element
KOKUSAI DENSHIN DENWA CO LTD3 citations63
US4729004AMar 1, 1988
Semiconductor photo device
KOKUSAI DENSHIN DENWA CO LTD6 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
US5912911AJun 15, 1999
Optical short pulse reshaping device
KOKUSAI DENSHIN DENWA CO LTD6 citations61