1
Teruno Nakaguma, Kentaro Ichii, Shoji Tanigawa: Ytterbium-doped optical fiber, fiber laser, and fiber amplifier. Fujikura, Sughrue Mion PLLC, January 29, 2013: US08363313 (143 worldwide citation)

An ytterbium-doped optical fiber of the present invention includes: a core which contains ytterbium, aluminum, and phosphorus and does not contain germanium; and a cladding which surrounds this core. The ytterbium concentration in the core in terms of ytterbium oxide is 0.09 to 0.68 mole percent. Th ...


2
Shoji Tanigawa, Teruno Nakaguma, Tomofumi Arai, Kentaro Ichii: Ytterbium-doped optical fiber, fiber laser and fiber amplifier. Fujikura, Sughrue Mion PLLC, January 27, 2015: US08941912 (143 worldwide citation)

An ytterbium-doped optical fiber includes: a core which contains at least ytterbium, aluminum, and phosphorus; and a cladding which encircles the core, wherein an aluminum oxide equivalent concentration of the aluminum in the core is 0.2 mol % or more, a diphosphorus pentaoxide equivalent concentrat ...


3
Shoichiro Matsuo, Hiroshi Kutami, Shoji Tanigawa: Disperson-shifted optical fiber employing dual shape core profile. Fujikura, Bell Boyd & Lloyd, February 17, 2004: US06694079 (27 worldwide citation)

A dispersion-shifted optical fiber is obtained that has a refractive index distribution shape comprising a center core portion of high refractive index, a step core portion of lower refractive index than the center core portion, provided about the outer circumference thereof, and clad of lower refra ...


4
Shoji Tanigawa, Shoichiro Matsuo, Kuniharu Himeno: Optical fiber and optical transmission path that uses the optical fiber. Fujikura, Sughrue Mion PLLC, August 9, 2005: US06928211 (18 worldwide citation)

There is provided at low cost an optical fiber suitable for wavelength division multiplex transmissions that has strengthened the tolerance to bending loss at even smaller bending diameters. The present invention is an optical fiber whose base material is silica glass and that has a two layer struct ...


5
Shoichiro Matsuo, Shoji Tanigawa, Tomio Abiru: Dispersion shifted optical fiber. Fujikura, Bell Boyd & Lloyd, April 8, 2003: US06546177 (11 worldwide citation)

In the present invention, by forming a dispersion shifted optical fiber that has a refractive index profile comprising: a central core portion


6
Shoichiro Matsuo, Shoji Tanigawa, Keisuke Uchiyama, Kuniharu Himeno: Optical fiber, transmission system, and wavelength division multiplexing system. Fujikura, Sughrue Mion PLLC, April 28, 2009: US07526168 (6 worldwide citation)

An optical fiber has a first mode field diameter in a dominant mode of an acoustic mode generated in the optical fiber different from a second mode field diameter in a light intensity distribution of the optical fiber. Furthermore, a transmission system is configured to perform an analog signal tran ...


7
Shoji Tanigawa, Tomoharu Sagawa, Masataka Ikeda, Shoichiro Matsuo, Kuniharu Himeno, Koichi Harada: Optical fiber polarization mode dispersion measurement method and measurement device. Fujikura, Sughrue Mion PLLC, May 1, 2007: US07212281 (5 worldwide citation)

A method of measuring polarization mode dispersion of an optical fiber includes inputting linearly polarized pulse light into an optical fiber, separating the input linearly polarized light from backscattered light from the optical fiber, detecting a light intensity of the backscattered light as tim ...


8
Shoji Tanigawa, Hironori Tanaka, Manabu Saito, Tetsuya Sakai, Tomoharu Kitabayashi: Optical pumping device, optical amplifier, fiber laser, and multicore fiber for optical pumping device. Fujikura, Sughrue Mion PLLC, November 23, 2010: US07840107 (5 worldwide citation)

An optical pumping device is provided in which a multi-core fiber obtained by bundling up a plurality of optical fibers, which are input ports, and a double clad fiber for optical pumping are spliced through a bridge fiber composed of a double clad fiber having a tapered shape. Accordingly, it is po ...


9
Ryuichiro Goto, Shoji Tanigawa, Shoichiro Matsuo, Kuniharu Himeno: Optical fiber and method of measuring polarization mode dispersion of optical fiber. Fujikura, Sughrue Mion Pllc, November 20, 2007: US07298934 (3 worldwide citation)

A method of measuring polarization mode dispersion (PMD) of an optical fiber, includes estimating PMD when an optical fiber is formed as an optical cable, from a beat length when the optical fiber is wound around a bobbin, and an average coupling length when the optical fiber is formed as the optica ...


10
Shoji Tanigawa, Katsuhiro Takenaga: Multicore fiber. Fujikura, Westerman Hattori Daniels & Adrian, April 14, 2015: US09008479 (3 worldwide citation)

A multicore fiber has a plurality of cores; and a clad which surrounds an outer peripheral surface of each of the cores, and at least one of the cores is spirally arranged such that the core rotates around a center axis of the clad. By arranging the cores in this way, it is possible to prevent cross ...