Inventor
NAKAZATO KOJI
JP15 patents
⚠️ This page may combine multiple inventors who share the name “NAKAZATO KOJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SUMITOMO ELECTRIC INDUSTRIES
13 patentsUS6282361B1Aug 28, 2001
Multi-channel variable optical attenuator
SUMITOMO ELECTRIC INDUSTRIES60 citations96
US5381503AJan 10, 1995
Mode field diameter conversion fiber
SUMITOMO ELECTRIC INDUSTRIES86 citations96
US6599039B1Jul 29, 2003
Optical transmission monitoring apparatus, optical transmission monitoring method, optical amplification system, method of controlling optical amplification system, and optical transmission system
SUMITOMO ELECTRIC INDUSTRIES30 citations92
US6359727B1Mar 19, 2002
Optical amplifier for wavelength-multiplexing transmission
SUMITOMO ELECTRIC INDUSTRIES23 citations92
US5721635AFeb 24, 1998
Optical fiber amplifier and optical amplifier repeater
SUMITOMO ELECTRIC INDUSTRIES21 citations92
US5572357ANov 5, 1996
Optical system for amplifying signal light
SUMITOMO ELECTRIC INDUSTRIES35 citations92
US5532870AJul 2, 1996
Optical fiber amplifier and optical amplifier repeater
SUMITOMO ELECTRIC INDUSTRIES32 citations92
US5446820AAug 29, 1995
Mode field diameter conversion optical fiber
SUMITOMO ELECTRIC INDUSTRIES21 citations92
US5253322AOct 12, 1993
Optical functioning glass and fiber amplifier
SUMITOMO ELECTRIC INDUSTRIES28 citations90
US5244846ASep 14, 1993
Optical functioning glass and apparatus using the same
SUMITOMO ELECTRIC INDUSTRIES16 citations82
US5640269AJun 17, 1997
Optical fiber amplifier and optical amplifier repeater
SUMITOMO ELECTRIC INDUSTRIES5 citations73
US5337401AAug 9, 1994
Optical functioning glass and method of manufacturing same, optical fiber, waveguide device, and laser device
SUMITOMO ELECTRIC INDUSTRIES10 citations73
US5377294ADec 27, 1994
Optical functioning glass and apparatus using the same
SUMITOMO ELECTRIC INDUSTRIES4 citations59