Inventor
KOGA MASAFUMI
JP8 patents
⚠️ This page may combine multiple inventors who share the name “KOGA MASAFUMI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NIPPON TELEGRAPH & TELEPHONE
7 patentsUS5617234AApr 1, 1997
Multiwavelength simultaneous monitoring circuit employing arrayed-waveguide grating
NIPPON TELEGRAPH & TELEPHONE234 citations97
US5754320AMay 19, 1998
Optical cross-connect system
NIPPON TELEGRAPH & TELEPHONE84 citations95
US5204771AApr 20, 1993
Optical circulator
NIPPON TELEGRAPH & TELEPHONE111 citations94
US5099114AMar 24, 1992
Optical wavelength demultiplexer
NIPPON TELEGRAPH & TELEPHONE36 citations92
US6626590B1Sep 30, 2003
Optical communication network
NIPPON TELEGRAPH & TELEPHONE36 citations89
US6545780B1Apr 8, 2003
Wavelength allocation method, a transmission equipment and receiving equipment using this method and a wavelength division multiplex transmission system
NIPPON TELEGRAPH & TELEPHONE14 citations81
US7970008B2Jun 28, 2011
Multiplexing transmission system and multiplexing transmission method
NIPPON TELEGRAPH & TELEPHONE4 citations62