Inventor
KASAHARA RYOICHI
JP43 patents
⚠️ This page may combine multiple inventors who share the name “KASAHARA RYOICHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
NIPPON TELEGRAPH & TELEPHONE
33 patentsUS6625370B2Sep 23, 2003
Optical waveguide and fabricating method thereof, and optical waveguide circuit
NIPPON TELEGRAPH & TELEPHONE8 citations73
US11442225B2Sep 13, 2022
Wavelength conversion element and method for manufacturing wavelength conversion element
NIPPON TELEGRAPH & TELEPHONE2 citations72
US11385521B2Jul 12, 2022
Wavelength conversion apparatus
NIPPON TELEGRAPH & TELEPHONE3 citations72
US11852953B2Dec 26, 2023
Optical element and manufacturing method thereof
NIPPON TELEGRAPH & TELEPHONE2 citations71
US11644735B2May 9, 2023
Wavelength conversion element
NIPPON TELEGRAPH & TELEPHONE2 citations71
US10799136B2Oct 13, 2020
Bioelectrode and garment
NIPPON TELEGRAPH & TELEPHONE3 citations71
US9459417B2Oct 4, 2016
Planar lightwave circuit
NIPPON TELEGRAPH & TELEPHONE2 citations62
US9116291B2Aug 25, 2015
Integrated optical module
NIPPON TELEGRAPH & TELEPHONE2 citations62
US12346000B2Jul 1, 2025
Planar optical waveguide device for measuring amplitude phase of squeezed light
NIPPON TELEGRAPH & TELEPHONE0 citations61
US12339564B2Jun 24, 2025
Wavelength conversion apparatus
NIPPON TELEGRAPH & TELEPHONE0 citations61
US11988873B2May 21, 2024
End structure of a waveguide
NIPPON TELEGRAPH & TELEPHONE0 citations61
US11971644B2Apr 30, 2024
Wavelength conversion device
NIPPON TELEGRAPH & TELEPHONE1 citations61
US11892745B2Feb 6, 2024
Wavelength conversion element and method for manufacturing same
NIPPON TELEGRAPH & TELEPHONE0 citations61
US11835768B2Dec 5, 2023
Filling resin and optical waveguide circuit filled with filling resin
NIPPON TELEGRAPH & TELEPHONE0 citations61
US11740537B2Aug 29, 2023
Optical signal processing circuit
NIPPON TELEGRAPH & TELEPHONE2 citations61
US11733584B2Aug 22, 2023
Wavelength conversion apparatus
NIPPON TELEGRAPH & TELEPHONE0 citations61
US8913889B2Dec 16, 2014
Optical module
NIPPON TELEGRAPH & TELEPHONE2 citations61
US12044883B2Jul 23, 2024
Optical waveguide and manufacturing method thereof
NIPPON TELEGRAPH & TELEPHONE0 citations60
US12007666B2Jun 11, 2024
Wavelength conversion element and method for producing same
NIPPON TELEGRAPH & TELEPHONE0 citations51
US11387909B2Jul 12, 2022
Optical signal transmitter
NIPPON TELEGRAPH & TELEPHONE0 citations51
US11324435B2May 10, 2022
Heartbeat detection method and heartbeat detection device
NIPPON TELEGRAPH & TELEPHONE0 citations51
US11076793B2Aug 3, 2021
Respiration estimation method and apparatus
NIPPON TELEGRAPH & TELEPHONE0 citations51
US9560763B2Jan 31, 2017
Package for optical module
NIPPON TELEGRAPH & TELEPHONE0 citations51
US12085836B2Sep 10, 2024
Optical amplifier
NIPPON TELEGRAPH & TELEPHONE0 citations50
US12032269B2Jul 9, 2024
Wavelength conversion apparatus
NIPPON TELEGRAPH & TELEPHONE0 citations50
US11888528B2Jan 30, 2024
Optical communication system
NIPPON TELEGRAPH & TELEPHONE0 citations50
US11815785B2Nov 14, 2023
Wavelength conversion optical element
NIPPON TELEGRAPH & TELEPHONE0 citations50
US11768421B2Sep 26, 2023
Wavelength conversion device
NIPPON TELEGRAPH & TELEPHONE0 citations50
US11733469B2Aug 22, 2023
Planar lightwave circuit and optical device
NIPPON TELEGRAPH & TELEPHONE0 citations50
US11635641B2Apr 25, 2023
Planar-lightwave-type optical device
NIPPON TELEGRAPH & TELEPHONE0 citations50
US11960152B2Apr 16, 2024
Method for adjusting transmitted wavelength of signal light transmitted through optical waveguide device
NIPPON TELEGRAPH & TELEPHONE0 citations49
US11269139B2Mar 8, 2022
Waveguide type optical interferometer circuit
NIPPON TELEGRAPH & TELEPHONE0 citations49
US11234613B2Feb 1, 2022
Respiration estimation method and apparatus
NIPPON TELEGRAPH & TELEPHONE0 citations47