Inventor
TACHIKAWA YOSHIAKI
JP3 patents
Patents
3 patentsUS6157025ADec 5, 2000
Disk shaped tunable optical filter
NIPPON TELEGRAPH & TELEPHONE76 citations95
US5414548AMay 9, 1995
Arrayed-wave guide grating multi/demultiplexer with loop-back optical paths
NIPPON TELEGRAPH & TELEPHONE151 citations95
US5905823AMay 18, 1999
Polarization independent optical nonreciprocal circuit based on even mode to odd mode conversion
NIPPON TELEGRAPH & TELEPHONE34 citations86