Fujikura Limited

Hokkaido University

Kuniharu Himeno

Shoichiro Matsuo

Kazuhiko Aikawa

Ning Guan

Katsuhiro Takenaga

Koichi Harada

Masakazu Nakayama

Shoji Tanigawa

Shogo Shimizu

Masashi Ikeda

Ryozo Yamauchi

Takaaki Suzuki

Ryuji Suzuki

Akira Wada

Daiichiro Tanaka

Naoki Shamoto

Masakazu Oohashi

Masaaki Ohtsuka

Fumio Suzuki

Michihiro Nakai

Tomoharu Kitabayashi

Keiji Ohashi

Munehisa Fujimaki

Mitsuru Kamikatano

Bunsho Ohtani

Katsuaki Izoe

Yoshihiro Terada

Ryuichiro Goto

Tsukasa Torimoto

Takamune Yamagami

Masataka Ikeda

Yutaka Nagasawa

Masahiro Kashiwagi

Tetsuya Sakai

Satoshi Okude

Kensuke Shima

Naritoshi Yamada

Osamu Fukuda

Hironori Tanaka

Tetsuo Nozawa

Hiroshi Hidaka

Shigefumi Yamasaki

Hiroyuki Sawano

Noboru Kawakami

Keisuke Uchiyama

Tatsuya Itoh

Yoshio Kikuchi

Masaaki Sudoh

Masakuni Mimuro

Fumihiko Nishimura

Hiroshi Kutami

Ryo Sugimoto

Tomoharu Sagawa

Shinji Habu

Harada Koichi

Shigeru Emori

Tadayuki Inaba

Yukihiro Sakaguchi

Tohru Arikawa

Minoru Sawada

Takuya Ienaka

An amplification optical fiber with an optical component capable of efficiently absorbing pumping light and a fiber laser device including the same are provided. An amplification optical fiber with an optical component in a fiber laser deviceincludes: an amplification optical fiberhaving a coredoped with an active element and a cladthrough which pumping light for amplifying light to be amplified propagating through the corepropagates; and an optical componentincluding at least one optical fibertohaving a first end coupled to a portion of the cladand a second end coupled to at least another portion of the cladat one endof the amplification optical fiber

Amplification optical fiber with optical component and fiber laser device including the same

The invention aims to provide a holey fiber that can release leak light propagating through the clad at a desired location, and a laser device using the holey fiber. A holey fiber includes: one end and the other end; a core; an inner clad coating the core; a hole layer having a large number of holes formed therein and coating the inner clad; and an outer clad coating the hole layer. In this holey fiber, a collapse region is formed, and the holes in the collapse region are squashed by a predetermined length in the length direction of the fiber.

Holey fiber, and laser device using the same

The invention provides an amplification optical fiber, which can output light with a good beam quality even when a higher-order mode is excited, and an optical fiber amplifier using the amplification optical fiber. An amplification optical fiberhas a coreand a cladcovering the core. The corepropagates light with a predetermined wavelength in at least an LP01 mode, and an LP02 mode, and an LP03 mode. When the LP01 mode, the LP02 mode, and the LP03 mode are standardized by power, in at least a part of a region where the intensity of the LP01 mode is larger than at least one of the intensities of the LP02 mode and the LP03 mode, the active element is added to the coreat a higher concentration than the central portion of the core.

Amplification optical fiber and optical fiber amplifier and resonator using the same

A fiber output stabilizer according to an aspect of the invention stabilizes output light from a rare-earth doped optical fiber in which at least one kind of a rare-earth element is added to a core. The fiber output stabilizer includes: a monitoring light source that emits monitoring light having a wavelength shorter than that of excitation light exciting the rare-earth element; an optical multiplexer that multiplexes the monitoring light into the excitation light; an optical demultiplexer that demultiplexes the monitoring light passing through the rare-earth doped optical fiber; and a passing light detector that detects light intensity of the monitoring light from the optical demultiplexer.

Fiber output stabilizer

A rare earth-doped core optical fiber of the present invention includes a core comprising a silica glass containing at least aluminum and ytterbium, and a clad provided around the core and comprising a silica glass having a lower refraction index than that of the core, wherein the core has an aluminum concentration of 2% by mass or more, and ytterbium is doped into the core at such a concentration that the absorption band which appears around a wavelength of 976 nm in the absorption band by ytterbium contained in the core shows a peak absorption coefficient of 800 dB/m or less.

Rare earth-doped core optical fiber and manufacturing method thereof

The invention relates to nanostructure and its manufacturing method. In the manufacturing method of a nanostructure, first anisotropic crystalline particles, connectors having end to be connected to a specific crystal face of each of said crystalline particles, and second particles to be connected to the other end of each of said connectors are prepared. First ends of the connectors are connected to specific crystal faces of the first crystalline particles, and simultaneously or before or after the connection, the second ends of the connectors are connected to the second particles. A nanostructure formed by this method has a three-dimensional structure which does not have a closest packing structure.

Nanostructure and manufacturing method for same

An extended triangular lattice type photonic bandgap fiber, includes a cladding and a capillary core, the cladding having a plurality of holes disposed within a silica glass portion in a longitudinal direction of the fiber and arranged in an extended triangular lattice shape, the capillary core having a plurality of holes arranged in a triangular lattice shape, wherein the cross-sectional area of the respective holes in the capillary core is smaller than that of the respective holes in the cladding.

Extended triangular lattice type photonic bandgap fiber

A method for measuring a multimode optical fiber includes: monitoring a temperature change within a measurement time in a DMD measurement of the multimode optical fiber, where the DMD measurement is carried out in an environment in which a magnitude of temperature change is controlled.

Method for measuring a differential mode delay of a multimode optical fiber

An optical fiber that includes a core containing a first concentration of germanium, an inner cladding arranged on the core, the inner cladding containing a second concentration of germanium and having a first diffusion coefficient, and an outer cladding arranged on the inner cladding, the outer cladding having a second diffusion coefficient, where the first diffusion coefficient is larger than the second diffusion coefficient, and where the first concentration of germanium is about 200% or more of the second concentration of germanium. An optical fiber constructed in this manner can be spliced with an optical fiber having a different MFD, such as a single-mode optical fiber or an erbium-doped optical fiber, with low splice loss and a sufficient splicing strength.

Optical fiber and optical fiber coupler, erbium-doped optical fiber amplifier, and optical waveguide using the same

An optical fiber comprises a center core and a cladding located at an outer periphery of the core, wherein the core comprises at least one codoped layer made from silica glass doped with germanium and fluorine, and at least one lower-concentration codoped layer made from silica glass doped with germanium, or silica glass that is doped with germanium and fluorine wherein an amount of fluorine in the lower-concentration codoped layer is smaller than an amount of fluorine in the codoped layer.

Optical fiber and transmission system, and wavelength division multiplexing system

A photonic band gap fiber is provided having multiple air holes in a silica portion extending in the longitudinal direction of the fiber. The fiber includes a cladding containing an air hole periodic structure in an extended triangular lattice configuration, wherein first rows each having a number of air holes at a first pitch are arranged alternately in the cross section of the fiber with multiple second rows of air holes each with multiple air holes at a second pitch which is twice the first pitch. The fiber further includes an air hole core.

Photonic band gap fiber and method of producing the same

The invention relates to nanostructure and its manufacturing method. In the manufacturing method of a nanostructure, first anisotropic crystalline particles, connectors having an end to be connected to a specific crystal face of each of said crystalline particles, and second particles to be connected to the other end of each of said connectors are prepared. First ends of the connectors are connected to specific crystal faces of the first crystalline particles, and simultaneously or before or after the connection, the second ends of the connectors are connected to the second particles. A nanostructure formed by this method has a three-dimensional structure which does not have a closest packing structure.

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 transmission, a baseband transmission, or an optical SCM transmission by use of the optical fiber.

Optical fiber, transmission system, and wavelength division multiplexing system

A single-mode optical fiber has a prescribed mode field diameter (MFD(&#x3bc;m)) at a first wavelength &#x3bb;, in which a bending loss when measured at a second wavelength &#x3bb;(&#x3bc;m) and wound with a bending radius r (mm) is L(dB) for one bending, a connector/splice loss with an optical fiber that has a prescribed mode field diameter MFD(&#x3bc;m) at the first wavelength &#x3bb;is L(dB) for one connection/splice point at the second wavelength &#x3bb;(&#x3bc;m), and an mode field diameter dependence of a total loss coefficient calculated by a formula (1) has a local minimal value in a range of MFD&#xb1;0.5 &#x3bc;m, with the formula (1) being as follows:,&#x2003;&#x2003;(1)=1,&#x2003;&#x2003;(2)w&#x3e;0, w&#x3e;0,&#x2003;&#x2003;(3)where wand win the formula (1) represent dimensionless weighting factors and are set within a range that satisfies the formulas (2) and (3).

Single-mode optical fiber

Growing community of inventors

Sakura, Japan

Kuniharu Himeno