Inventor
OHTSUKA TAKAFUMI
JP15 patents
Patents
15 patentsUS11402585B2Aug 2, 2022
Optical connection structure
SUMITOMO ELECTRIC INDUSTRIES3 citations72
US12362530B2Jul 15, 2025
Optical amplifier and optical communication system
SUMITOMO ELECTRIC INDUSTRIES0 citations60
US11088504B2Aug 10, 2021
Optical fiber amplifier
SUMITOMO ELECTRIC INDUSTRIES0 citations51
US9482822B2Nov 1, 2016
Wavelength selector switch
SUMITOMO ELECTRIC INDUSTRIES0 citations51
US9372311B2Jun 21, 2016
Wavelength selective switch
SUMITOMO ELECTRIC INDUSTRIES1 citations51
US9326050B2Apr 26, 2016
Wavelength selective switch and method of manufacturing same
SUMITOMO ELECTRIC INDUSTRIES1 citations51
US9151902B2Oct 6, 2015
Wavelength selective switch
SUMITOMO ELECTRIC INDUSTRIES1 citations50
US12345597B2Jul 1, 2025
Mode-dependent loss measurement device and mode-dependent loss measurement method
SUMITOMO ELECTRIC INDUSTRIES0 citations49
US11927802B2Mar 12, 2024
Optical module and method for manufacturing optical module
SUMITOMO ELECTRIC INDUSTRIES0 citations49
US11800802B2Oct 24, 2023
Radiation device and emission cooling device
SUMITOMO ELECTRIC INDUSTRIES0 citations49
US9606296B2Mar 28, 2017
Optical path control device
SUMITOMO ELECTRIC INDUSTRIES0 citations49
US10429235B2Oct 1, 2019
Optical fiber sensor system for strain detection
SUMITOMO ELECTRIC INDUSTRIES0 citations39
US10184788B2Jan 22, 2019
Optical fiber sensor system having a polarization separator
SUMITOMO ELECTRIC INDUSTRIES0 citations39
US9651436B2May 16, 2017
Interferometric optical fiber sensor system and interferometric optical fiber sensor head
SUMITOMO ELECTRIC INDUSTRIES0 citations39
US9277301B2Mar 1, 2016
Optical unit and optical device
SUMITOMO ELECTRIC INDUSTRIES0 citations39