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11. 发明专利

JPH03109227A PRODUCTION OF OPTICAL FIBER PREFORM 失效
公开(公告)号：JPH03109227A
公开(公告)日：1991-05-09
申请号：JP24564889
申请日：1989-09-20
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OMAE TOSHIKAZU , TANAKA HIROYUKI , YOSHIDA MINORU , MORISAWA MASAAKI , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： G02B6/00 , C03B8/04 , C03B37/014 , G02F1/35
摘要： PURPOSE:To obtain the optical fiber preform in which the core soot is uniformly doped with rare-earth elements by impregnating the porous core soot produced by VAD method with an alcoholic soln. contg. rare-earth elements in a specified manner, drying, melting and sintering the impregnated soot. CONSTITUTION:The porous core soot as the halt-sintered glass fine particles is produced by VAD method. The core soot is then dipped in a prepared alcoholic soln. (a) contg. rare-earth elements. In this case, only the lower end of the core soot (b) is dipped in the soln. (a), and the soln. (a) is sucked up into the part of the core soot above the soln. surface by capillarity. As the soln. (a) is gradually infiltrated into the core soot, (b), the air remaining in the core soot (b) is gradually discharged, and the core soot is uniformly doped with the rare-earth elements. The core soot is then allowed to stand at room temp. to sufficiently vaporize the alcohol, and the shape and outer diameter are regulated. The core soot is sintered at about 1500 deg.C in the atmosphere contg. gaseous He and chlorine, dehydrated and transparently vitrified to obtain a desired core rod.

12. 发明专利

JPH02309308A OPTICAL FIBER 失效
公开(公告)号：JPH02309308A
公开(公告)日：1990-12-25
申请号：JP13227589
申请日：1989-05-24
申请人： MITSUBISHI CABLE IND LTD
发明人： ENDO MORINOBU , TANAKA HIROYUKI , OMAE TOSHIKAZU
IPC分类号： G02B6/44
摘要： PURPOSE:To prevent the infiltration of hydrogen into the glass substance of a core and clad from the outside and to prevent the deterioration in performance, such as increase in transmission loss by providing a carbon layer having a crystal structure in the outside part of the clad provided on the core. CONSTITUTION:This optical fiber has the ordinary core 1 and clad 2 and is formed with the carbon layer 3 formed by laminating a layer 4 of an amorphous state and a layer 5 of a crystalline state on the outer periphery of the clad 2. A silicone resin layer 6 and a plastic jacket 7 consisting of a thermoplastic resin etc., are provided on the carbon layer 3. In such optical fiber having the carbon layer 3, the hydrogen from the outside of the optical fiber does not arrive at all at the core 1 and clad 2 which are the glass substance. The deterioration in the performance, such as transmission characteristics of the optical fiber, is, therefore, effectively prevented.

13. 发明专利

JPH0243783A OPTICAL FIBER LASER OSCILLATING DEVICE 失效
公开(公告)号：JPH0243783A
公开(公告)日：1990-02-14
申请号：JP19377388
申请日：1988-08-03
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA HIROYUKI , OMAE TOSHIKAZU , HAYASHI TOKUJI , YOSHIDA MINORU , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： G02B6/42 , G02B5/20 , H01S3/06 , H01S3/067 , H01S3/083 , H01S3/106 , H01S3/17
摘要： PURPOSE:To obtain an oscillating device, which is fast, cheap, small in size, easy to assemble, and excellent in efficiency, by a method wherein a ring-shaped oscillation optical fiber containing a rare earth element doped fiber is connected to an exciting ray inputting optical fiber through a fiber coupler, and a loss control fiber is provided as a part of the oscillation optical fiber. CONSTITUTION:An oscillation device is constituted in such a manner that a ring-shaped oscillation optical fiber 2 containing a rare earth element doped fiber 9 is connected with an exciting ray input optical fiber 1 through a fiber coupler 3, a loss control fiber 7 is provided as a part of the above oscillation optical fiber 2, and the loss of the loss control fiber 7 is made to vary to control an oscillating wave in length. For instance, the above oscillation fiber 2 is composed of an optical fiber 5 of low loss, two or more loss control fibers 7 whose ends on one side are connected to one end of the optical fiber 5 through an optical branching device 6, and a rare earth element doped fiber 9 whose one end is connected to the other ends of the loss control fibers 7 through an optical switch 8, where the other end of the rare earth element fiber 9 is connected with the other end of the above optical fiber 5 through a connector 10.

14. 发明专利

JPH0243782A OPTICAL FIBER LASER DEVICE 失效
公开(公告)号：JPH0243782A
公开(公告)日：1990-02-14
申请号：JP19377288
申请日：1988-08-03
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA HIROYUKI , OMAE TOSHIKAZU , HAYASHI TOKUJI , SUZUKI TOSHIYA , YOSHIDA MINORU , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： G02B6/42 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/17
摘要： PURPOSE:To obtain an optical fiber laser device which is fast, cheap, small in size, and easy to assemble by a method wherein an oscillator, connected with a rare earth element doped fiber and an exciting ray input optical fiber through fiber couplers, is connected to amplifiers, arranged in two or more stages, which are connected with rare earth element doped fibers and exciting ray input optical fibers through optical couplers. CONSTITUTION:An oscillator 4, connected to a rare earth element doped fiber 1 and an exciting ray input optical fiber 2 through a coupler, is connected to amplifiers 9, which are connected to rare earth element doped fibers 8 and exciting ray input optical fibers 7 through fiber couplers 6, arranged in two or more stages. For instance, starting ends of the optical fibers 2 and 7 are connected to an exciting ray source such as a laser diode or the like, and the terminal end of the rare earth element doped fiber 8 of the lase stage amplifier 9 is connected with the starting ends of an oscillated laser ray output optical fiber 12 and an exciting ray lead-out optical fiber 13 through a fiber coupler 11. And, the rare earth element doped fibers 8 of the amplifiers 9 of amplifying stages are all the same in core diameter, the refractive index difference between a core and a clad, a doped amount of a rare earth element, and length.

15. 发明专利

JPS62207733A PRODUCTION OF SINGLE-MODE OPTICAL FIBER BASE MATERIAL 失效
公开(公告)号：JPS62207733A
公开(公告)日：1987-09-12
申请号：JP4685186
申请日：1986-03-04
申请人： MITSUBISHI CABLE IND LTD
发明人： TANAKA HIROYUKI , OMAE TOSHIKAZU , KIKUKAWA YOSHINORI , SUZUKI MINORU , ISHIKURA MASAYUKI
IPC分类号： G02B6/00 , C03B37/014
摘要： PURPOSE:To obtain the titled single-mode optical fiber base material having a low content of an OH group and uniform refractive index distribution by flame-hydrolyzing a glass forming gas, doping germanium oxide, and sintering the material in an atmosphere contg. an inert gas, oxygen, and a specified amt. of gaseous chlorine. CONSTITUTION:A gaseous glass material, gaseous germanium chloride, and a carrier gas are introduced from a multiple burner 1, and porous soot for a core part is formed by flame hydrolysis on a seed rod 3. A gaseous glass material and a carrier gas are then introduced onto the outer periphery from a multiple burner 2 to form a clad layer by flame hydrolysis, and a porous glass base material 4 is formed. The base material 4 is hung in a baking furnace 6, a sintering gas consisting of gaseous chlorine, an inert gas, and oxygen is introduced from an inlet pipe 7 to successively heat the base material 4 from the lower end, and an optical fiber base material 8 is formed. At this time, the content of the gaseous chlorine in the sintering gaseous atmosphere is controlled to >=3mol% and

16. 发明专利

JPS62202833A PRODUCTION OF PARENT MATERIAL FOR QUARTZ GLASS OPTICAL FIBER 失效
公开(公告)号：JPS62202833A
公开(公告)日：1987-09-07
申请号：JP4493786
申请日：1986-02-28
申请人： MITSUBISHI CABLE IND LTD
发明人： TANAKA HIROYUKI , OMAE TOSHIKAZU , ISHIJIMA TETSUO
IPC分类号： G02B6/00 , C03B37/014 , C03B37/018
摘要： PURPOSE:The soot of SiO2 is formed on the outer surface of the core and the soot of SiO2 doped with fluorine and boron is formed thereon, then they are roasted in a fluorine-containing gas to produce the core having low refractive index and high adhesion to the clad. CONSTITUTION:SiCl4, H2, Ar and O2 are sent to a multi-tubular burner 1, while SiCl4, Ar, H2, O2 and BF3 are sent from the multi-tubular burner for the clad to form SiO2 soot and SiO2 soot doped with fluorine and boron on the surface of the quartz glass core 3. The product is placed in an electric furnace and roasted at about 1,500 deg.C in a fluorine-roasting gas. The process according to the present invention makes fluorine easily included in the core and the fluorine concentration in the roasting gas is controlled to give a parent material for optical fiber having the core of low refractive index.

17. 发明专利

JP2004102281A Photonic crystal fiber and method for manufacturing the same 审中-公开
公开(公告)号：JP2004102281A
公开(公告)日：2004-04-02
申请号：JP2003312492
申请日：2003-09-04
申请人： Mitsubishi Cable Ind Ltd , Nippon Telegr & Teleph Corp , 三菱電線工業株式会社 , 日本電信電話株式会社
发明人： YOSHIDA MINORU , TANAKA MASATOSHI , FUJITA MORIYUKI , OMAE TOSHIKAZU , IMAMURA KAZUO , NAKAZAWA MASATAKA , KUBOTA HIROKAZU , KAWANISHI SATOKI
IPC分类号： G02B6/00 , C03B37/012 , C03B37/027 , G02B6/02 , G02B6/032 , G02B6/20
CPC分类号： G02B6/02347 , C03B37/01225 , C03B37/02745 , C03B37/02781 , C03B2203/14 , C03B2203/16 , C03B2203/18 , C03B2203/20 , C03B2203/42 , C03B2205/06 , G02B6/02371
摘要： PROBLEM TO BE SOLVED: To provide a photonic crystal fiber which can change propagatable wavelengths and dispersion values and a method for manufacturing the same. SOLUTION: The photonic crystal fiber is provided with a perforated section 12 which is most closely arrayed with a number of pores 12a extending in the central axial direction of a fiber and a core section 11 which is formed to a solid or hollow form at the center of the perforated section 12. The perforated section 12 is formed by being twisted around the central axis of the fiber. COPYRIGHT: (C)2004,JPO

18. 发明专利

JP2003226537A METHOD FOR MANUFACTURING OPTICAL FIBER PREFORM 审中-公开
公开(公告)号：JP2003226537A
公开(公告)日：2003-08-12
申请号：JP2002025225
申请日：2002-02-01
申请人： MITSUBISHI CABLE IND LTD
发明人： SEMIMOTO KENZO , OMAE TOSHIKAZU , HATTORI KUNIHIRO , YAMADA TOMOO , FUJITA MORIYUKI , YAMAMOTO TETSUYA
IPC分类号： G02B6/00 , C03B37/012 , C03C3/06 , C03C13/04
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a rare earth element-doped optical fiber preform by which the PMD (polarization mode dispersion) can be reduced by an easy method and intrusion of bubbles can be prevented. SOLUTION: A quartz rod 2 doped with Er and Al is inserted into a quartz tube 1 and one end of the quartz tube 1 is sealed. The outer surface of the quartz tube 1 is heated with a burner 3 while the space between the quartz tube 1 and the quartz rod 2 is evacuated by use of a vacuum pump to collapse the quartz tube 1 to weld with the quartz rod 2. Heating is performed while controlling the temperature of the quartz rod 2 to a range from 1,000 to 1,400°C. COPYRIGHT: (C)2003,JPO

19. 发明专利

JPH10231135A PRODUCTION OF OPTICAL FIBER BASE MATERIAL 失效
公开(公告)号：JPH10231135A
公开(公告)日：1998-09-02
申请号：JP3745197
申请日：1997-02-21
申请人： MITSUBISHI CABLE IND LTD
发明人： SASAKI TOSHIHISA , OMAE TOSHIKAZU
IPC分类号： G02B6/00 , C03B37/012
摘要： PROBLEM TO BE SOLVED: To reduce the loss of a finally produced optical fiber even of a special glass by enabling the easier and surer integration of a core rod with split clad rods. SOLUTION: A concave groove is formed on one of a pair of half clad rods in the longitudinal direction over all length, a core rod is imbedded in the groove, and the half clad rod is covered with the other half clad rod to form a compound base material 3. Each of a pair of dies 4, 4 has a half circular embedding groove 41 on the facing side and a buffer layer 42 of a specified thickness having elasticity is formed on the surface of the groove. The compound base material is placed between the dies 4, 4 and they are heated under the application of stress directing the center along a diameter on the compound base material to surely integrate them. The whole part including the dies is placed in a vacuum container to dispense with troublesome controls of pressure difference and atmosphere. The integration may be performed by heating the compound base material in a state where it is placed in a tube having thermal shrinking to impart stress directing the center along a diameter or by applying drawing force on the compound base material inserted into a muffle tube to act a diameter-reducing force on it.

20. 发明专利

JPH088832A OPTICAL AMPLIFIER 失效
公开(公告)号：JPH088832A
公开(公告)日：1996-01-12
申请号：JP14170794
申请日：1994-06-23
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIDA MINORU , OKUYAMA TAKASHI , OMAE TOSHIKAZU , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： H01S3/07 , H01S3/06 , H01S3/067 , H01S3/094 , H01S3/10 , H01S3/17 , H04B10/07 , H04B10/293 , H04B10/564 , H04B10/572 , H04B10/14 , H04B10/04 , H04B10/06
摘要： PURPOSE:To obtain a stable gain without use of a laser diode for the control by controlling the output of an excited light source depending on the increase/ decrease in an exciting light transmitting through a rare-earth group element doped fiber. CONSTITUTION:An optical amplifier 1 is configured to control the gain by monitoring an exciting light and provided with an EDF 2 being a rare earth element doped fiber and with an AGC circuit 8. When a signal light is received by the EDF 2, the gain results in subject to change. In this case, a light absorbing coefficient of the exciting light is changed. The change in the light absorbing coefficient of the exciting light appears as a change in the attenuation of the exciting light. The change in the attenuation of the exciting light is discriminated by a detected value of a transmission exciting light (exciting light transmitted through the EDF 2) detected by a photodiode 6. Thus, the gain is made stably by allowing a control section 7 to apply feedback control to an output of the exciting light source 4 based on the detected value of the photodiode 6.

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