Inventor
TAKENAGA KATSUHIRO
JP55 patents
⚠️ This page may combine multiple inventors who share the name “TAKENAGA KATSUHIRO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
FUJIKURA LTD
42 patentsUS7817257B2Oct 19, 2010
Method for measuring a differential mode delay of a multimode optical fiber
FUJIKURA LTD22 citations93
US7406235B2Jul 29, 2008
Graded-index multimode fiber and manufacturing method therefor
FUJIKURA LTD44 citations92
US7292762B2Nov 6, 2007
Hole-assisted holey fiber and low bending loss multimode holey fiber
FUJIKURA LTD36 citations92
US7242870B2Jul 10, 2007
Wavelength division multiplexing system
FUJIKURA LTD22 citations92
US7043126B2May 9, 2006
Graded-index multimode fiber and manufacturing method therefor
FUJIKURA LTD55 citations92
US10042114B2Aug 7, 2018
Multicore fiber for communication
FUJIKURA LTD5 citations84
US9008479B2Apr 14, 2015
Multicore fiber
FUJIKURA LTD14 citations84
US8965165B2Feb 24, 2015
Multicore fiber
FUJIKURA LTD7 citations84
US8381548B2Feb 26, 2013
Method of manufacturing photonic band gap fiber base material and fiber
FUJIKURA LTD7 citations84
US9817183B2Nov 14, 2017
Multicore fiber
FUJIKURA LTD14 citations83
US9588284B2Mar 7, 2017
Multi-core fiber
FUJIKURA LTD10 citations83
US9069118B2Jun 30, 2015
Optical fan-in/fan-out device
FUJIKURA LTD10 citations83
US8971685B2Mar 3, 2015
Multicore fiber
FUJIKURA LTD7 citations83
US7139457B2Nov 21, 2006
Method for compensating modal dispersion in multimode optical fiber transmission path
FUJIKURA LTD14 citations81
US9086519B2Jul 21, 2015
Multi-core fiber, and multi-core fiber connection method using the same
FUJIKURA LTD9 citations79
US10663653B2May 26, 2020
Multicore fiber for communication
FUJIKURA LTD1 citations73
US10310176B2Jun 4, 2019
Multi-core fiber
FUJIKURA LTD3 citations73
US10156674B2Dec 18, 2018
Multicore fiber for communication
FUJIKURA LTD4 citations73
US10101526B2Oct 16, 2018
Multicore fiber
FUJIKURA LTD5 citations73
US9435943B1Sep 6, 2016
Optical device
FUJIKURA LTD5 citations73
US9366807B2Jun 14, 2016
Method of producing preform for coupled multi-core fiber, method of producing coupled multi-core fiber, and coupled multi-core fiber
FUJIKURA LTD3 citations73
US9891377B2Feb 13, 2018
Multicore fiber and optical cable
FUJIKURA LTD4 citations72
US9698557B2Jul 4, 2017
Optical fiber for amplification and optical fiber amplifier using the same
FUJIKURA LTD3 citations72
US9673589B2Jun 6, 2017
Amplification optical fiber and optical fiber amplifier
FUJIKURA LTD2 citations72
US9069116B2Jun 30, 2015
Fan-in/fan-out device for multicore fiber
FUJIKURA LTD6 citations72
US11960120B2Apr 16, 2024
Method for aligning multicore fiber, method for manufacturing multicore fiber connector, device for aligning multicore fiber, and multicore fiber fusion splicing machine
FUJIKURA LTD5 citations70
US7593611B2Sep 22, 2009
Photonic band gap fiber and method of producing the same
FUJIKURA LTD2 citations63
US10690843B2Jun 23, 2020
Multicore fiber
FUJIKURA LTD1 citations62
US10488297B2Nov 26, 2019
Characteristic-measuring apparatus and characteristic-measuring method for multi-core fiber
FUJIKURA LTD1 citations61
US10365429B2Jul 30, 2019
Multicore fiber and optical cable
FUJIKURA LTD1 citations61
US9515450B2Dec 6, 2016
Amplifying optical fiber and optical amplifier
FUJIKURA LTD2 citations61
US10295736B2May 21, 2019
Multicore fiber
FUJIKURA LTD1 citations60
US9199411B2Dec 1, 2015
Method of connecting multi-core fibers
FUJIKURA LTD2 citations60
US12092859B2Sep 17, 2024
Multicore fiber, optical fiber cable, and optical connector
FUJIKURA LTD0 citations59
US12092879B2Sep 17, 2024
Multicore fiber, optical fiber cable, and optical connector
FUJIKURA LTD0 citations59
US12459853B2Nov 4, 2025
Multi-core optical fiber preform, multi-core optical fiber preform production method, and multi-core optical fiber production method
FUJIKURA LTD0 citations57
US9477035B2Oct 25, 2016
Optical device
FUJIKURA LTD1 citations52
US7831121B2Nov 9, 2010
Extended triangular lattice type photonic bandgap fiber
FUJIKURA LTD1 citations52
US7551824B2Jun 23, 2009
Extended triangular lattice type photonic bandgap fiber
FUJIKURA LTD0 citations52
US10656327B2May 19, 2020
Optical fiber
FUJIKURA LTD0 citations51
US9252556B2Feb 2, 2016
Amplifying optical fiber and optical amplifier
FUJIKURA LTD1 citations51
US11834365B2Dec 5, 2023
Optical fiber preform production method, optical fiber preform, and optical fiber production method
FUJIKURA LTD0 citations47
TAKENAGA KATSUHIRO
4 patentsUS8285094B2Oct 9, 2012
Multicore fiber
TAKENAGA KATSUHIRO26 citations88
US8526775B2Sep 3, 2013
Fiber fuse terminator with optical fiber with a core and a cladding having longitudinal holes therein
TAKENAGA KATSUHIRO3 citations62
US8391323B2Mar 5, 2013
Fiber laser device
TAKENAGA KATSUHIRO2 citations62
US8244091B2Aug 14, 2012
Fiber fuse terminator
TAKENAGA KATSUHIRO1 citations51
TANIGAWA SHOJI
4 patentsUS8660396B2Feb 25, 2014
Multi-cladding optical fiber, optical fiber module, fiber laser, and fiber amplifier
TANIGAWA SHOJI2 citations61
US9121995B2Sep 1, 2015
Optical fiber having holes
TANIGAWA SHOJI3 citations60
US8971684B2Mar 3, 2015
Method of producing preform for coupled multi-core fiber, method of producing coupled multi-core fiber, and coupled multi-core fiber
TANIGAWA SHOJI1 citations51
US8750663B2Jun 10, 2014
Coupled multicore fiber
TANIGAWA SHOJI1 citations51
Showing the top 50 of 55 patents by PatentIndex Score.