Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Autonetworks Technologies, Limited

Nippon Telegraph and Telephone Corporation

Kyushu University

Eneos Corporation

Sumitomo Electric Industries, Co.

Kohei Kobayashi

Tomoyuki Hattori

Kaoru Okuno

Ken Takahashi

Ichiro Tsuchiya

Eisuke Sasaoka

Shigeru Tanaka

Masashi Onishi

Toshihisa Sato

Ryoei Oka

Kenji Tamano

Mitsuomi Hada

Takatoshi Kato

Takashi Fujii

Yasuo Matsuda

Yasushi Koyano

Kazuhiro Okamoto

Morio Watanabe

Shinjiro Hagihara

Minoru Watanabe

Tatsuya Hase

Yoichi Ishiguro

Toshifumi Hosoya

Gotaro Tanaka

Keiichiro Fukuda

Masaharu Ooe

Hiroaki Ohta

Takashi Sasaki

Hiroki Hirai

Kenji Ito

Akira Inoue

Manabu Shiozaki

Hidetoshi Ishida

Yuichi Ohga

Takehiro Hosokawa

Kazuhiro Yagishita

Makoto Mizoguchi

Koichi Yoshida

Yoshiaki Yamano

Kazuo Nakashima

Katsuya Nagayama

Nobuhiro Akasaka

Yutaka Takata

Tetsuya Nakamura

Kazuya Kuwahara

Naoyuki Oshiumi

Takuji Ootsuka

Katsuyuki Tsuneishi

Tatsuya Kakuta

Kazumasa Oishi

Hideki Nomura

Kenichi Komiya

Takaaki Ito

Shigeru Tomita

Yuji Shitara

Kei Sunaga

Hideo Miyaki

Tatsuo Saito

Dai Yui

Shigenori Takaki

Teruo Ikechi

Kouji Takata

Hikaru Sato

Masayuki Okubo

A surface protection composition which is hard to deform or flow even placed under environments of a large temperature change with an external physical load such as pressure, and which stably protects a metal surface. A terminal fitted electric wire coated with the composition. The surface protection composition contains a high-consistency material (A) containing a lubricant base oil and an amide compound, and a phosphorus composition (B). The phosphorus composition (B) contains a composition (b1) containing one or more compounds represented by the general formulae (1) and (2) and one or more metals and/or one or more amines. The phosphorus composition (B) also contains one or more compounds (b2) represented by the general formula (3).

Surface protection composition and terminal fitted electric wire

A wire with terminalincludes a wirehaving a conductor partand an insulation coatingsurrounding the conductor part, a water stop portionto be held in close contact with an outer surface of the insulation coating, and a terminalhaving a conductor crimping portionto be crimped to the conductor partand a water stop holding portionconfigured to hold the water stop portionby being held in close contact with an outer surface side of the water stop portion

Wire with terminal and method for producing wire with terminal

A wiring harness capable of reliably blocking a leak path after an endurance test and exhibiting a good waterproof performance over a long period of time. The wiring harness has a waterproof structure in which a spliced portion is formed by joining conductors that are exposed by partially removing coating materials, and a conductor exposed portion composed of a bundle of the exposed conductors. An outer peripheral surface of each coating material end part of each insulated wire adjacent to the conductor exposed portion are continuously covered with a waterproofing agent to seal the conductor exposed portion and is configured using a reactive adhesive having a gel fraction in a range of 20 to 70% as the waterproofing agent.

Wiring harness having waterproofing agent with reactive adhesive

After a wide-band DCF is wound around a bobbin to form an optical fiber coilthe latter is removed from the bobbin and placed into a bundle state (the state where the increase in transmission loss in the wavelength band of 1.55 &#x3bc;m caused by distortions in winding is reduced by 0.1 dB/km or more) released from distortions in winding. A resinis used as a coil-tidying member so as to secure the optical fiber coilto a storage caseat four positions. Both ends of the optical fiber coilare connected to pigtail fibers at fusion-splicing partsrespectively. Even when the storage caseis closed with a lid after the optical fiber coilis secured to the storage casewith the resinthere remain interstices within the bundle of the optical fiber coiland a space between the optical fiber coiland the storage caseAs a result, even when the optical fiber coilin a bundle state is accommodated in the storage casetransmission loss and the like would not increase.

Optical device and a making method thereof

The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 &mgr;m in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 &mgr;m. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, provided on the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber, the relative refractive index difference of the core region with respect to the outer cladding is 0.30% or more but 0.50% or less, and the relative refractive index difference of the inner cladding with respect to the outer cladding is &minus;0.50% or more but &minus;0.02% or less. Also, the optical fiber has a dispersion greater than 18 ps/nm/km at a wavelength of 1.55 &mgr;m, and an effective area of 70 &mgr;m or more at the wavelength of 1.55 &mgr;m.

Optical fiber

After a wide-band DCF is wound around a bobbin to form an optical fiber coil , the latter is removed from the bobbin and placed into a bundle state (the state where the increase in transmission loss in the wavelength band of 1.55 &mgr;m caused by distortions in winding is reduced by 0.1 dB/km or more) released from distortions in winding. A resin is used as a coil-tidying member so as to secure the optical fiber coil to a storage case at four positions. Both ends of the optical fiber coil are connected to pigtail fibers at fusion-splicing parts , respectively. Even when the storage case is closed with a lid after the optical fiber coil is secured to the storage case with the resin , there remain interstices within the bundle of the optical fiber coil and a space between the optical fiber coil and the storage case . As a result, even when the optical fiber coil in a bundle state is accommodated in the storage case , transmission loss and the like would not increase.

There is disclosed a dispersion compensator for compensating for a chromatic dispersion and dispersion slope of an optical fiber transmission line, the dispersion compensator comprising a plurality of dispersion-compensating optical fibers connected to each other, the dispersion-compensating optical fibers each having a dispersion slope compensation ratio of at least 60% with respect to the optical fiber transmission line at a predetermined wavelength, one of said plurality of dispersion-compensating optical fibers having a dispersion slope compensation ratio of at least 80%, another of said plurality of dispersion-compensating optical fibers having a dispersion slope compensation ratio within the range of 60% to 100%.

Dispersion compensator and optical transmission system

The present invention relates to an optical fiber having a large positive dispersion in a wavelength band of 1.55 &mgr;m in order to compensate for a negative dispersion inherent in an NZ-DSF in the wavelength band of 1.55 &mgr;m. This optical fiber comprises a depressed cladding structure constituted by a core region; an inner cladding, disposed at the outer periphery of the core region, having a lower refractive index; and an outer cladding having a higher refractive index. In this optical fiber, the relative refractive index difference of the core region with respect to the outer cladding is at least 0.30% but not greater than 0.50%, and the relative refractive index difference of the inner cladding with respect to the outer cladding is at least &minus;0.50% but not greater than &minus;0.02%. Also, the optical fiber has a dispersion greater than 18 ps/nm/km at a wavelength of 1.55 &mgr;m, and an effective cross-sectional area A of at least 70 &mgr;m at the wavelength of 1.55 &mgr;m.

Optical fiber having a large positive dispersion

An optical fiber ( ) which does not readily suffer influences of side pressures and can realize superior transmission characteristics, having a glass part ( ) having a core ( ) and at least one cladding ( ) and at least one covering layer ( ) formed around the glass part ( ), characterized in that the Young's modulus at 23&deg; C. of the covering layer ( ) without the glass part ( ) is not greater than 400 MPa. The Young's modulus measurement of the covering layer ( ) is obtained by removing the glass part ( ) from the optical fiber ( ) and putting the covering layer ( ) to a tensile test.

There is provided an optical fiber drawing furnace capable of drawing an optical fiber having small non circularity, which drawing furnace includes a muffle tube, in which an optical fiber preform is supplied, a heater surrounding the muffle tube, a plurality of electrode connecting portion extending from the heater, a plurality of electrodes connected to electrode connecting portions, and in conjunction therewith to an electric power source, and unifying means for unifying the temperature distribution along the circumferential direction.

Optical fiber drawing furnace with a zig zag heating element

After a wide-band DCF is wound around a bobbin to form an optical fiber coil , the latter is removed from the bobbin and placed into a bundle state (the state where the increase in transmission loss in the wavelength band of 1.55 &mgr;m caused by distortions in winding is reduced by 0.1 dB/km or more) released from distortions in winding. A resin is used as a coil-tidying member so as to secure the optical fiber coil to a storage case at four positions. Both ends of the optical fiber coil are connected to pigtail fibers at fusion-splicing parts ; respectively. Even when the storage case is closed with a lid after the optical fiber coil is secured to the storage case with the resin , there remain interstices within the bundle of the optical fiber coil and a space between the optical fiber coil and the storage case . As a result, even when the optical fiber coil in a bundle state is accommodated in the storage case , transmission loss and the like would not increase.

Coiled optical assembly and fabricating method for the same

In a method of making a ribbon type coated optical fiber comprising the step of inserting a plurality of optical fibers flatly arranged parallel to each other through a die orifice so as to collectively coat the optical fibers with a coating resin the ratio W/H of a clearance W in the width direction between the inner surface of the die orifice and the outer surface of the optical fibers to a clearance H in the thickness direction therebetween is set within the range of 1.0 to 2.5.

Method of producing tape type optical fiber core wire

The present invention provides a fiber optic connector comprising a fiber pressing member and a substrate having a part A with multiple fiber arranging grooves in which bare portion of optical fibers are fixed, and a part B in which coated portion of optical fibers are fixed, and its manufacturing method. The connector enables to prevent an increase in transmission loss or breakage of the optical fibers by reducing the localized stress on the fibers from the rear end of the fiber pressing member and the rear end edge of the fiber arranging grooves.

Fiber optic connector and its manufacturing method

An apparatus for producing optical fiber ribbons which has a optical fiber gathering device, one or more coating applicators and a turn roller arranged in a straight line, with one or more alignment guide in plate form being provided on a travelling line of optical fibers or optical fiber ribbons upstream of the coating applicator. The alignment guide is chamfered to arch form on the side that contacts the optical fibers or the optical fiber ribbons. The alignment guide suppresses the optical fibers or the optical fiber ribbons from vibrating in a direction perpendicular to the direction of the arrangement of the optical fibers or the optical fiber ribbons.

Method and apparatus for producing optical fiber ribbons

Growing community of inventors

Kanagawa, Japan

Kohei Kobayashi