Sumitomo Electric Industries, Limited

Kyushu University

Shinji Ishikawa

Hiroo Kanamori

Masakazu Shigehara

Motoki Kakui

Yuichi Ohga

Ichiro Tsuchiya

Eisuke Sasaoka

Haruhiko Aikawa

Masahide Saito

Masashi Onishi

Tadashi Enomoto

Akira Urano

Shigeru Semura

Shinji Endo

Masayuki Nishimura

Takatoshi Kato

Tetsuya Haruna

Masumi Ito

Sumio Hoshino

Dai Yui

Hiroshi Yokota

Hiroshi Suganuma

Akira Inoue

Toshiki Taru

Michiko Harumoto

Masahide Saitoh

Masatoshi Majima

Tsutomu Watanabe

Toshiaki Okuno

Michihisa Kyoto

Michiko Takushima

Toru Iwashima

Shigeru Hirai

Chisai Hirose

Shigeru Tanaka

Takahiro Saito

Takemi Hasegawa

Kazuki Okuno

Yoichi Ishiguro

Motonori Nakamura

Tatsuhiko Saito

Tomonori Kashiwada

Chizai Hirose

Takashi Sasaki

Atsushi Inoue

Kenji Takahashi

Tetsuya Nakanishi

Toshiaki Kakii

Masayuki Shigematsu

Katsuya Nagayama

Takahiro Murata

Yoshiaki Terasawa

Masaki Ohmura

Koji Nakazato

Masahiro Takagi

Tetsufumi Tsuzaki

Masao Tsukitani

Iwao Okazaki

Tatsuhiko Saitoh

Ichiro Yoshimura

Yoshiki Chigusa

Toshikazu Shibata

Toshimi Habasaki

Ken Hashimoto

Morio Watanabe

Soichi Endo

Junji Iihara

Nobuyuki Taira

Toru Adachi

Motohide Yoshida

Toshimi Suzuki

Kazuyuki Soma

Tetsutarou Katayama

Masayuki Kiya

Takenori Uchiyama

Michiko Takushima (nee Harumoto)

Horoshi Yokota

Taiichiro Yamashita

Yoshinori Makio

Tetsutaro Katayama

Toshihiko Shishido

Ken-ichiro Miyatake

Masaki Oomura

Provided is a method for producing a porous carbon material, containing a step of subjecting a mixture containing inorganic carbide particles and inorganic oxide particles to a heat treatment under a chlorine gas atmosphere.

Method for producing porous carbon material

A porous carbon material for an electric double-layer capacitor electrode, in which the porous carbon material is formed from secondary particles having a particle size of from 3 &#x3bc;m to 100 &#x3bc;m, the secondary particles are formed from primary particles having a particle size of from 0.1 &#x3bc;m to 0.5 &#x3bc;m, and the porous carbon material has an internal specific surface area of 900 m/g or greater.

Porous carbon material for electric double-layer capacitor electrode, method of producing the same, and electric double-layer capacitor electrode

The method for producing silicon metal and porous carbon from rice hulls is provided. The method comprises a first step Sof producing a rice hull charcoal Mcontaining SiOand C by heat treatment of rice hulls M; a second step Sof exposing the rice hull charcoal Mto at least any one of heated first inert gas Gor reducing gas to produce SiC; a third step Sof exposing SiC to a heating atmosphere containing Clgas to produce SiCland porous carbon P; a fourth step Sof reacting SiCland Zn to produce silicon metal Pand ZnCl; and a fifth step Sof electrolyzing ZnClto produce Zn and Clgas. The Clgas in the fifth step Sis used in the third step S, and Zn in the fifth step Sis used in the fourth step S

Method for producing silicon metal and porous carbon

Provided is a capacitor in which, even in the case of a high maximum charging voltage, decomposition of the electrolyte can be suppressed and charging and discharging can be performed with stability. The capacitor includes a positive electrode containing a positive-electrode active material, a negative electrode containing a negative-electrode active material, a separator disposed between the positive electrode and the negative electrode, and an electrolyte, wherein the positive-electrode active material contains a porous carbon material, in a volume-based pore size distribution of the porous carbon material, a cumulative volume of pores having a pore size of 1 nm or less accounts for 85% or more of a total pore volume, the porous carbon material has a crystallite size of 1 to 10 nm, the porous carbon material contains an oxygen-containing functional group, and a content of the oxygen-containing functional group is 3.3 mol % or less.

Capacitor and method for charging and discharging the same

An electrode active material for capacitors contains a porous carbon material. The porous carbon material has a BET specific surface area of 800 m/g or more. An X-ray diffraction image of the porous carbon material with CuK&#x3b1; rays has a peak Pat 2&#x3b8;=40&#xb0; to 50&#xb0;, and the peak Pincludes a component of a peak Pattributed to a (111) plane of diamond crystals. When the X-ray diffraction image has a peak Pattributed to a (002) plane of graphite, a ratio of an intensity Iof Pto an intensity Iof P(I/I) is 3.0 or less.

Electrode active material for capacitor, and capacitor using said electrode active material

This manufacturing process has: a step of performing a heating treatment in a contact state of SiC with Clto form a porous carbon material; a step of reacting SiClformed along with the porous carbon material in the foregoing step, with Zn to extract Si; and a step of reacting Si extracted in the foregoing step, with C to form SiC, and the process further has: a step of reducing ZnClformed by reaction of SiClwith Zn, to extract Zn and Cl. These steps are repetitively carried out, SiC extracted by the step of forming SiC is used in the step of forming the porous carbon material, Clextracted by reduction of ZnClis used in the step of forming the porous carbon, and Zn extracted by reduction of ZnClis used in the reaction step of SiClwith Zn.

Process for manufacturing porous carbon material

The present invention relates to an optical fiber preform fabricating method that makes it possible to implement a reduction in iron impurities at a low cost. The optical fiber preform fabricating method comprises a glass synthesis step for forming a glass region constituting at least a part of the core area of the optical fiber. The glass synthesis step includes a deposition step of depositing glass particles containing the Al-element inside the glass pipe by means of chemical vapor deposition, and a consolidation step of obtaining a transparent glass body from the glass soot body thus obtained. In other words, the deposition step synthesizes glass particles on the inside wall of a glass pipe by feeding raw material gas, in which the content ratio (O/Al) of the O-element and Al-element is 20 or less, into the glass pipe. Furthermore, the consolidation step obtains a transparent glass body from the glass soot body by heating the glass soot body. The transparent glass body that is formed in the consolidation step constitutes part of the core region.

Optical fiber preform fabricating method

Provided is an erbium doped optical fiber (EDF) for amplification which allows an easy estimation of the amplification performance and high production stability. The fiber includes a core and a cladding. The core is mainly made of silica glass and doped with erbium at a concentration of 500 wtppm or more and 2500 wtppm or less. In the fiber, the cutoff wavelength is 850 nm or more and 1450 nm or less, the mode field diameter is 4.5 &#x3bc;m or more and 6.5 &#x3bc;m or less, the polarization mode dispersion is not more than 0.1 ps per 10 m, the coordination number of oxygen elements around an erbium element in the core is one or more and eight or less, and the bond length between erbium and oxygen is 0.225 nm or more and 0.235 or less.

Optical fiber for amplification

The present invention relates to an optical amplification fiber and others capable of effectively reducing nonlinear interaction between signal channels even in transmission of multiplexed signal light containing multiple signal channels arranged in high density and also effectively reducing bending loss. An optical amplification module has an optical isolator, a WDM coupler, an Er-doped optical fiber (EDF) as an optical amplification fiber, a WDM coupler, and an optical isolator, which are arranged in order on a signal light propagation path from an input connector to an output connector, and further has a pumping light source connected to the WDM coupler and a pumping light source connected to the other WDM coupler. The EDF, at the wavelength of 1607 nm, has a mode field diameter (MFD) of 10 &#x3bc;m or more to the fundamental mode and a MAC number (=MFD/cutoff wavelength) of 6.8 or less to the fundamental mode.

Optical amplification fiber, optical amplifier module, optical communication system and optical amplifying method

An optical fiber can efficiently excite metallic ions by a pump lightwave, and an optical fiber amplifier and an optical fiber laser light source both incorporate the optical fiber. The optical fiber comprises (a) a solid region that has a first region doped with metallic ions and a second region surrounding the first region and that allows a lightwave for exciting the metallic ions to travel in a multiple mode and (b) a third region surrounding the second region and having a plurality of holes stretching along the length of the optical fiber. The optical fiber has a structure in which the first region is supplied with the power of a lightwave that is included in the pump lightwave and that is in a mode having no intensity peak at the center axis of the solid region.

Optical fiber, optical fiber amplifier, and optical fiber laser light source

An optical fiber bundle that has better ultraviolet resistance characteristics at a wavelength range of 150 to 250 nm and that can be readily and cheaply manufactured with no risk of, for example, explosion during manufacturing and its manufacturing method are provided. In the optical fiber bundle, optical fibers including a core mainly containing silica glass and a cladding containing silica glass and fluorine are bundled and accommodated in a container. This container has optically transparent ends, accommodates hydrogen or deuterium as well as the optical fibers, and is sealed. The capacity of the container is 10 times or less as large as the volume of glass of the optical fibers. The method of manufacturing the optical fiber bundle includes the steps of impregnating the optical fibers with hydrogen or deuterium by keeping the optical fibers in a hydrogen or deuterium atmosphere; bundling the optical fibers and accommodating the bundled optical fibers in the container before the hydrogen or deuterium desorbs from the optical fibers; and sealing the container so that hydrogen or deuterium that has desorbed from the optical fibers can be kept in the container.

Optical fiber bundle and method of manufacturing the same

The present invention relates to an optical fiber having a structure which allows further improvements to be made both in terms of lower reflectance and narrower bandwidth, and to a fiber grating type filter including the optical fiber. The optical fiber applied to the fiber grating type filter comprises a core region extending along a predetermined axis, and a cladding region provided on an outer periphery of the core region. The core region does not contain any photosensitive dopant which contributes to predetermined wavelength light photosensitivity as a glass property, but a part of the cladding region contain such a photosensitive dopant. By means of this composition, it is possible to form a grating, which has a grating plane slanted by a predetermined angle with respect to the optical axis, in a part of the cladding region surrounding the core region.

Optical fiber and fiber grating type filter including the same

The present invention provides fluorescent glass containing at least 50 mol % of at least one kind of oxide selected from the group consisting of SiO, GeO, and POas a glass constituent of a region containing a Bi ion as a dopant.

Fluorescence glass, optical wave guide for optical amplifier and optical amplifier module

A method produces a glass body that contains a reduced amount of OH groups in the metallic-oxide-containing glass layer and that has a reduced amount of transmission loss due to OH groups when the glass body is transformed into an optical fiber. The production method produces an optical glass body. An optical fiber contains the optical glass body in at least one part of its region for guiding a lightwave. The production method includes the following steps: (a) introducing into a glass pipe a gas containing an organometallic compound and a glass-forming material; (b) decomposing the organometallic compound into an organic constituent and a metallic constituent; (c) heating and oxidizing the metallic constituent so that produced glass particles containing a metallic oxide are deposited on the inner surface of the glass pipe to form a glass-particle-deposited layer; and (d) consolidating the deposited layer to form a metallic-oxide-containing glass layer.

Glass-body-producing method and optical glass body and optical fiber

Based on an intermediateA in which a cladding portionis formed on the outer periphery of a core portion, a pair of holesandare provided parallel to the z axis on both sides of the core portionwithin the cladding portion, and an intermediateis thereby fabricated. In this intermediate, a width Ry in the y-axis direction is made smaller than a width Rx in the x-axis direction. Moreover, a cylindrical stress applying partis inserted into a holeof the intermediate, and a cylindrical stress applying partis inserted into a holethereof. Thus, a preformis formed. These materials are drawn and integrated together, and a polarization maintaining optical fiber is thereby manufactured.

Polarized wave holding optical fiber, and method of producing the same

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Yokohama, Japan

Shinji Ishikawa