Inventor
SANO HIROHISA
JP27 patents
⚠️ This page may combine multiple inventors who share the name “SANO HIROHISA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
23 patentsUS5515196AMay 7, 1996
Optical intensity and phase modulators in an optical transmitter apparatus
HITACHI LTD158 citations98
US5574289ANov 12, 1996
Semiconductor optical integrated device and light receiver using said device
HITACHI LTD60 citations96
US6488416B1Dec 3, 2002
Optical module, board mounted optical module, and assembly method of optical module
HITACHI LTD22 citations92
US6362905B1Mar 26, 2002
Optical crossconnect apparatus and optical transmission system
HITACHI LTD36 citations92
US5710847AJan 20, 1998
Semiconductor optical functional device
HITACHI LTD23 citations92
US5339370AAug 16, 1994
Optical modulator and optical communication system utilizing the same
HITACHI LTD28 citations92
US5140453AAug 18, 1992
Optical receiving method utilizing polarization diversity and apparatus for carrying out the same
HITACHI LTD32 citations92
US4909584AMar 20, 1990
Optical multi/demultiplexer and optical module using the same
HITACHI LTD34 citations92
US4904037AFeb 27, 1990
Waveguide type optical device with thermal compensation layers
HITACHI LTD32 citations92
US4822128AApr 18, 1989
Optical fiber star coupler and method of manufacturing the same
HITACHI LTD32 citations92
US4790614ADec 13, 1988
Optical filter and optical device using same
HITACHI LTD35 citations92
US4756587AJul 12, 1988
Optical multi/demultiplexer
HITACHI LTD29 citations92
US6111998AAug 29, 2000
Semiconductor optical device, fiber optical amplifier and optical transmission system
HITACHI LTD35 citations90
US5742423AApr 21, 1998
Semiconductor optical modulator
HITACHI LTD18 citations84
US6868210B2Mar 15, 2005
Optical waveguide and their application of the optical communication system
HITACHI LTD9 citations74
US5570439AOct 29, 1996
Optical waveguide device and optical transmission system
HITACHI LTD14 citations74
US6813445B2Nov 2, 2004
Optical crossconnect apparatus and optical transmission system
HITACHI LTD6 citations73
US6317230B1Nov 13, 2001
Optical cross-connect system and optical transmission system
HITACHI LTD14 citations73
US4953934ASep 4, 1990
Waveguide type light merging and branching device
HITACHI LTD9 citations71
US7292519B2Nov 6, 2007
Optical head with lasers and mirrors in a recess formed in a substrate
HITACHI LTD6 citations63
US5763897AJun 9, 1998
Non-uniform thickness or bandgap superlattice betweeen cladding layer and multi-quantum well structure of pin optical waveguide
HITACHI LTD3 citations63
US5422967AJun 6, 1995
Self-routing optical switch and optical switch array
HITACHI LTD5 citations59
US7272314B2Sep 18, 2007
Optical crossconnect apparatus and optical transmission system
HITACHI LTD0 citations52