Inventor
WADA KAZUMI
US39 patents
⚠️ This page may combine multiple inventors who share the name “WADA KAZUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
MASSACHUSETTS INST TECHNOLOGY
30 patentsUS6812495B2Nov 2, 2004
Ge photodetectors
MASSACHUSETTS INST TECHNOLOGY113 citations98
US6697551B2Feb 24, 2004
Mode transformer between low index difference waveguide and high index difference waveguide
MASSACHUSETTS INST TECHNOLOGY57 citations95
US6690871B2Feb 10, 2004
Graded index waveguide
MASSACHUSETTS INST TECHNOLOGY65 citations95
US6631225B2Oct 7, 2003
Mode coupler between low index difference waveguide and high index difference waveguide
MASSACHUSETTS INST TECHNOLOGY70 citations95
US6621972B2Sep 16, 2003
Optical waveguides with trench structures
MASSACHUSETTS INST TECHNOLOGY53 citations94
US7723754B2May 25, 2010
Ge photodetectors
MASSACHUSETTS INST TECHNOLOGY25 citations93
US6743974B2Jun 1, 2004
Silicon solar cell with germanium backside solar cell
MASSACHUSETTS INST TECHNOLOGY28 citations93
US7043120B2May 9, 2006
Array waveguide grating
MASSACHUSETTS INST TECHNOLOGY22 citations92
US6946318B2Sep 20, 2005
Method of forming GE photodetectors
MASSACHUSETTS INST TECHNOLOGY38 citations92
US6850683B2Feb 1, 2005
Low-loss waveguide and method of making same
MASSACHUSETTS INST TECHNOLOGY50 citations92
US7123805B2Oct 17, 2006
Multiple oxidation smoothing method for reducing silicon waveguide roughness
MASSACHUSETTS INST TECHNOLOGY25 citations91
US7190524B2Mar 13, 2007
Process for fabrication of high reflectors by reversal of layer sequence and application thereof
MASSACHUSETTS INST TECHNOLOGY26 citations90
US7103245B2Sep 5, 2006
High density integrated optical chip
MASSACHUSETTS INST TECHNOLOGY44 citations89
US6904187B2Jun 7, 2005
Method of efficient carrier generation in silicon waveguide systems for switching/modulating purposes using parallel pump and signal waveguides
MASSACHUSETTS INST TECHNOLOGY26 citations88
US7310454B2Dec 18, 2007
Photonic bandgap modulator, amplifier, demux, and TDM devices
MASSACHUSETTS INST TECHNOLOGY13 citations84
US10571335B2Feb 25, 2020
Methods and apparatus for spectral imaging
MASSACHUSETTS INST TECHNOLOGY7 citations81
US6832027B2Dec 14, 2004
Interleavers for AWGs
MASSACHUSETTS INST TECHNOLOGY8 citations74
US6859321B2Feb 22, 2005
Low voltage tunable photonic crystal with large defects as wavelength routing
MASSACHUSETTS INST TECHNOLOGY7 citations73
US6750393B2Jun 15, 2004
Back reflector of solar cells
MASSACHUSETTS INST TECHNOLOGY11 citations73
US7120335B2Oct 10, 2006
Vertically and laterally confined 3D optical coupler
MASSACHUSETTS INST TECHNOLOGY8 citations71
US11067754B2Jul 20, 2021
Simultaneous electrical and optical connections for flip chip assembly
MASSACHUSETTS INST TECHNOLOGY2 citations67
US6944368B2Sep 13, 2005
Waveguide-to-semiconductor device coupler
MASSACHUSETTS INST TECHNOLOGY2 citations63
US7787176B2Aug 31, 2010
On-chip optical amplifier
MASSACHUSETTS INST TECHNOLOGY5 citations61
US7239762B2Jul 3, 2007
Light modulation using the Franz-Keldysh effect
MASSACHUSETTS INST TECHNOLOGY6 citations61
US7812423B2Oct 12, 2010
Optical device comprising crystalline semiconductor layer and reflective element
MASSACHUSETTS INST TECHNOLOGY2 citations60
US11604147B2Mar 14, 2023
Amorphous germanium waveguides for spectroscopic sensing and data communication applications
MASSACHUSETTS INST TECHNOLOGY0 citations56
US11204327B2Dec 21, 2021
Amorphous germanium waveguides for spectroscopic sensing and data communication applications
MASSACHUSETTS INST TECHNOLOGY1 citations56
US7251402B2Jul 31, 2007
Anti-reflection coating for the pass-band of photonic bandgap crystal
MASSACHUSETTS INST TECHNOLOGY6 citations56
US7238412B2Jul 3, 2007
Thermally and electrically conducting high index contrast multi-layer mirrors and devices
MASSACHUSETTS INST TECHNOLOGY0 citations52
US7352934B2Apr 1, 2008
Three dimensional high index optical waveguides bends and splitters
MASSACHUSETTS INST TECHNOLOGY0 citations50