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1. 发明专利

CA1171659A METHOD FOR PREPARING OPTICAL FIBERS 未知
公开(公告)号：CA1171659A
公开(公告)日：1984-07-31
申请号：CA371327
申请日：1981-02-20
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KIMURA TAKAO , SAKAGUCHI SHIGEKI , TAKATA HISAO
IPC分类号： C03C25/10 , C03C25/12 , G02B6/44 , C03C25/02
摘要： In a process for preparing optical fibers, an optical fiber preform is heated and softened to be drawn at a high speed into an optical fiber. The optical fiber is passed through a plastic pipe of a thermoplastic resin. As the optical fiber is passed through the plastic pipe, the lower part of the plastic pipe is gradually inserted into a heating unit to be uniformly heated. The heated plastic pipe is softened and is coated over the optical fiber.

2. 发明专利

DE3106412A1 未知
公开(公告)号：DE3106412A1
公开(公告)日：1981-12-24
申请号：DE3106412
申请日：1981-02-20
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KIMURA TAKAO , SAKAGUCHI SHIGEKI , TAKATA HISAO , NAKAHARA MOTOHIRO
IPC分类号： C03C25/10 , C03C25/106 , C03C25/12 , C03C25/02 , C03B37/025 , C03B37/075 , G02B5/14

3. 发明专利

FR2476635A1 未知
公开(公告)号：FR2476635A1
公开(公告)日：1981-08-28
申请号：FR8103459
申请日：1981-02-20
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KIMURA TAKAO , SAKAGUCHI SHIGEKI , TAKATA HISAO , NAKAHARA MOTOHIRO
IPC分类号： C03C25/10 , C03C25/106 , C03C25/12 , C03C25/02 , C03B37/02 , G02B5/16

4. 发明专利

JP2001051114A MULTILAYER FILM LIGHT WAVELENGTH FILTER AND ITS MANUFACTURE 失效
公开(公告)号：JP2001051114A
公开(公告)日：2001-02-23
申请号：JP22818799
申请日：1999-08-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAKAGUCHI SHIGEKI
IPC分类号： G02B5/28 , H04B10/00 , H04B10/27 , H04B10/29 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To solve a problem of deformation or a characteristic with the lapse of time, by composing only of glass material, and by manufacturing a precursor having a laminated structure similar to a desired filter, and thereafter by forming into a filter by drawing or pressing. SOLUTION: Glass material to be formed into a high refractive index layer 1 and a low refractive index layer 2 is cut out in a pane shape and polished, and thereafter the panes are piled up so as to form a laminated structure in the clean atmosphere, to thereby form a laminated body. The laminated body is pressed so as to have the thickness of about 1 mm by using a metal mold, and divided into a precursor. Then, the precursor is heated and drawn to form a filter. The manufactured multilayer film is a thin film obtained by only deformation of raw material as it is, therefore a characteristic of the raw material is preserved as it is. Therefore, a factor causing a change with the lapse of time, such as a density difference between the raw material and the thin film or the like, like conventional method, does not exist. On the other hand, as for manufacturing, the film is manufactured by drawing the precursor having a similar figure to the filter, therefore mass production having a non-dispersive characteristic and an excellent yield becomes possible.

5. 发明专利

JP2000206576A ELEMENT FOR OPTICAL SWITCH AND OPTICAL SWITCH 失效
公开(公告)号：JP2000206576A
公开(公告)日：2000-07-28
申请号：JP285999
申请日：1999-01-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAKAGUCHI SHIGEKI , SUGIMOTO NAOTO
IPC分类号： G02F1/31
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive high performance optical switch having no movable part. SOLUTION: This optical switch is equipped with a multilayered film Faraday rotator 3 having a structure of periodically laminated layers of magneto-optical material and dielectric material, index distribution type rod lenses 4a, 4b, input/ output fibers 7a, 7b, 7c, 7d, and a magnet 5 to apply a magnetic field on the Faraday rotator 3. When a magnetic field is applied on the Faraday rotator 3, the input light through the fiber 7a is outputted to the fiber 7b. When no magnetic field is applied, the input light from the fiber 7a is outputted to the optical fiber 7d.

6. 发明专利

JPH10239645A VARIABLE WAVELENGTH GRATING WAVEGUIDE 失效
公开(公告)号：JPH10239645A
公开(公告)日：1998-09-11
申请号：JP4177497
申请日：1997-02-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： EBISAWA FUMIHIRO , SUKEGAWA TAKESHI , YOSHIDA TAKUJI , ARISHIMA KOICHI , SAKAGUCHI SHIGEKI , OKAMOTO KATSUNARI , HOSHINO MITSUTOSHI
IPC分类号： G02F1/01 , G02F1/19
摘要： PROBLEM TO BE SOLVED: To vary the grating wavelength by utilizing refractive index variation by arranging a filler in a groove formed in the upper part of the core of an optical waveguide and thus forming an upper clad. SOLUTION: The groove which is deep up to right above the core 3 is ground in two arm waveguides by reactive ion etching and this groove is filled with a fluorinated epoxy resin 6 containing a self-hold type photochromic material whose refractive index is adjusted. Further, a driving device for a small-sized xenon flash lamp is prepared to irradiate the fluorinated epoxy resin 6 with pulses of ultraviolet rays and visible light. Then the flash light of the ultraviolet rays or visible light is blinked at fixed blinking frequency. Consequently, arbitrary branch wavelength can be varied and the waveguide can hold the selected wavelength by itself without any electric power.

7. 发明专利

JPH08198637A GLASS COMPOSITION 失效
公开(公告)号：JPH08198637A
公开(公告)日：1996-08-06
申请号：JP465695
申请日：1995-01-17
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TODOROKI SHINICHI , SAKAGUCHI SHIGEKI
IPC分类号： G02B6/00 , C03B37/012 , C03C3/112 , H01S3/06 , H01S3/17
摘要： PURPOSE: To obtain a glass for optical parts, which is small in Rayleigh scattering and is stably vitrified in a silicate glass. CONSTITUTION: This glass for optical parts is an oxyfluoride glass composition composed of at least silicon, a bivalent metal, a univalent metal, oxygen and fluorine and satisfies all the following conditions (1)-(4) about the composition. The condition (1), silicon occupies >=40% to =18% to

8. 发明专利

JPH08188434A MOLD FOR PRODUCING PREFORM FOR OPTICAL FIBER AND PRODUCTION OF PREFORM FOR OPTICAL FIBER USING THE SAME MOLD 失效
公开(公告)号：JPH08188434A
公开(公告)日：1996-07-23
申请号：JP26194295
申请日：1995-09-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OISHI YASUTAKE , SAKAGUCHI SHIGEKI
IPC分类号： G02B6/00 , C03B8/00 , C03B19/02 , C03B20/00 , C03B37/012 , C03B37/014
摘要： PURPOSE: To obtain a preform capable of providing an optical fiber having an ultralow loss by successively casting a clad glass melt and a core glass melt into a hollow part of a mold having the hollow part and a hollow bottom having a larger diameter than that of the hollow part. CONSTITUTION: A mold 1 for producing a preform for an optical fiber equipped with a hollow part 1A for forming the preform for the optical fiber having a uniform diameter or a diameter increasing from the upper to the lower parts and a hollow bottom connecting to the hollow part 1A in the lower part thereof and further a larger diameter of the hollow bottom than that of the lower end of the hollow part 1A is prepared and a clad glass melt 2 is then cast into the hollow part 1A of the mold 1. A core glass melt 4 is then cast onto the clad glass melt 2 to make the core glass melt 4 flow into the hollow bottom in the central part of the clad glass melt 2. The resultant casting is then cooled to afford the preform for the optical fiber.

9. 发明专利

JPH0743539A IR OPTICAL WAVEGUIDE 失效
公开(公告)号：JPH0743539A
公开(公告)日：1995-02-14
申请号：JP24712792
申请日：1992-08-25
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAKAGUCHI SHIGEKI
IPC分类号： G02B6/12
摘要： PURPOSE:To obtain such an optical waveguide formed on a substrate that can be operated in an IR region and connected to a fluoride optical fiber and to stably produce a glass material for a waveguide on a substrate with good quality and good accuracy. CONSTITUTION:Alumina is used as the material for a substrate 1 on which an optical waveguide 2 is produced by forming glass essentially comprising germanium oxide on the alumina substrate. Fine particles of germanium oxide are sprayed and deposited on the alumina substrate 1. The deposited particles are heated and cooled to make a transparent film-like plantar optical waveguide. Further, the waveguide film is patterned by lithography and RIE to obtain a patterned optical waveguide. By using germanium oxide glass, the obtd. optical waveguide can be connected to a fluoride optical fiber and has no optical loss in a long wavelength region. Since coeffts. of thermal expansion of alumina and germanium oxide are equal to each other, these materials can be firmly bonded.

10. 发明专利

JPH0741332A OPTICAL FIBER DRAWING DEVICE AND DRAWING METHOD USING THE DEVICE 失效
公开(公告)号：JPH0741332A
公开(公告)日：1995-02-10
申请号：JP19099693
申请日：1993-08-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAKAGUCHI SHIGEKI
IPC分类号： C03B37/027 , C03B37/03 , G02B6/00
摘要： PURPOSE:To draw an optical fiber by using a device having a dancer device capable of stably winding an optical fiber drawn at a high rate. CONSTITUTION:This optical fiber drawing device is provided with a capstan 16 for drawing and receiving at least an optical fiber 4 and a drum 17 for winding the optical fiber and has a dancer device for adjusting the traveling speed of the drawn optical between the capstan 16 and the drum 17. The characteristic frequency of the dancer device is set lower than the forced frequency caused when the optical fiber 4 is received or the optical fiber is wound and drawn.

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