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71. 发明专利

JPH04295833A OPTICAL FIBER FOR AMPLIFICATION 失效
公开(公告)号：JPH04295833A
公开(公告)日：1992-10-20
申请号：JP6020691
申请日：1991-03-25
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OIZUMI SEIRO , YOSHIDA MINORU , MORISAWA MASAAKI , TANAKA HIROYUKI , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： G02B6/00 , G02F1/35 , H01S3/06 , H01S3/17
摘要： PURPOSE:To improve a satd. output characteristic and amplification width gain by doping aluminum and lanthanum together with erbium to a core part. CONSTITUTION:Signal light is made incident via a signal light incident connector 2 on an optical fiber 4 for incidence of signal light and is further made incident in the state of being mixed with exciting light by an optical coupler 10 via an optical isolator 12 on an optical fiber 14 for amplification. The signal light is amplified in the state of light directly by an induction releasing effect in the process of progressing in the optical fiber 14 for amplification. An optical fiber formed by doping both the Al(aluminum) and the La(lanthanum) together with the Er(erbium) to the core part is used as the optical fiber 14 for amplification. The ratio contributing to the energy level at which the electrons of the Er ions contribute to the induction releasing effect, i.e., inversion distribution quantity can be additionally decreased by doping the La together with the Al, by which the satd. output characteristic and the amplification gain are improved.

72. 发明专利

JPH04285041A PRODUCTION OF HERMETICALLY COATED OPTICAL FIBER 失效
公开(公告)号：JPH04285041A
公开(公告)日：1992-10-09
申请号：JP7451891
申请日：1991-03-14
申请人： MITSUBISHI CABLE IND LTD
发明人： ZUSHI TOSHIHIRO , NAKAHARA SHIGERU , MORISAWA MASAAKI , NAGAE NOBUSADA , KAIDE TAMOTSU , TANAKA HIROYUKI
IPC分类号： C03C25/42 , C23C16/26 , G02B6/00 , G02B6/44
摘要： PURPOSE:To provide a quartz glass-based optical fiber hermetically coated with a carbon film and relatively high in initial breaking strength. CONSTITUTION:A high-temp. quartz glass optical fiber 3 drawn from an optical fiber preform 2 is immediately introduced into a reaction tube 5 and passed through the tube. A hydrocarbon gas diluted with an inert gas is supplied to the reaction tube 5 from the hydrocarbon source 8 and inert gas source 9 through flow controllers 10 and 11. The concn. of the hydrocarbon gas in the dil. gas is controlled to 15-35% or preferably to 20-30%. A hot CVD reaction is caused in the reaction tube 5, and the film of carbon produced by the thermal decomposition of the hydrocarbon is formed on the optical fiber surface.

73. 发明专利

JPH0393655A PRODUCTION OF ALUMINUM-COATED OPTICAL FIBER AND APPARATUS FOR PRODUCING THE SAME 失效
公开(公告)号：JPH0393655A
公开(公告)日：1991-04-18
申请号：JP22935189
申请日：1989-09-06
申请人： MITSUBISHI CABLE IND LTD
发明人： NAKAHARA SHIGERU , WATABE TAMISHIGE , NAGAE NOBUSADA , KAMAUCHI MASAHARU , TANAKA HIROYUKI
IPC分类号： G02B6/44 , C03C25/42
摘要： PURPOSE:To improve quality by leading drawn optical fiber into molten Al, coating the optical fiber with the molten Al and sensing leaked light from the optical fiber coated with the Al just after taking thereof from the lower part of the molten Al. CONSTITUTION:Quartz glass optical fiber is drawn from the tip of a preform 1 heated in an electric furnace 2, passed through an inlet die 43 while being naturally cooled and introduced into molten Al 42 melted in a melting crucible 41. The resultant Al-coated optical fiber 6 having the Al coating layer, solidified and applied to the periphery thereof is taken from an outlet 44, passed through a take-off device 7 and wound onto a winding reel 9. When all the optical sensors 13 of one or plural optical sensing units 10 provided around the Al- coated optical fiber 6 taken from the outlet die 44 sense no leaked light from the Al-coated optical fiber 6, a control signal is sent to start winding. If any of the optical sensors 13 sense the leaked light, an alarm is raised to take countermeasures.

74. 发明专利

JPH02309307A OPTICAL FIBER 失效
公开(公告)号：JPH02309307A
公开(公告)日：1990-12-25
申请号：JP13227489
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 an amorphous carbon layer which does not contain hydrogen in the outside part of the clad provided on the core. CONSTITUTION:This optical fiber has the core 1 and the clad 2 and is formed with the amorphous carbon layer 3 which does not contain the hydrogen on the outer perihery of the clad 2. A silicone resin layer 4 and a plastic jacket 5 consisting of a thermoplastic resin, etc., are provided on the carbon layer 3. The hydrogen is not substantially bound in the dangling bond in the layer from the beginning with the optical fiber having the carbon layer 3 in such a manner and, therefore, the arrival of the hydrogen at the core 1 and clad 2 which are the glass substance is substantially eliminated. The deterioration in the performance, such as transmission characteristics of the optical fiber, is, therefore, effectively prevented.

75. 发明专利

JPH01260342A DETERMINATION OF DOPE LEVEL FOR RARE EARTH ELEMENT-DOPED OPTICAL FIBER 失效
公开(公告)号：JPH01260342A
公开(公告)日：1989-10-17
申请号：JP8854388
申请日：1988-04-11
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： HAYASHI TOKUJI , YOSHIDA MINORU , TANAKA HIROYUKI , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： G01M11/00 , G01M11/02 , G01N21/27
摘要： PURPOSE:To determine a dope level of rare earth element accurately, by a method wherein an absorption value of light per unit length of a rare earth doped optical fiber is determined from a difference of quantity of light measured and a cut length before and after the cutting of the rare earth doped optical fiber connected to a single- mode optical fiber with a low loss. CONSTITUTION:Measuring light with a specified wavelength emitted from a spectroscope 1 is made incident from an incident optical system 2 into the other end of a single mode optical fiber 3 with a rare earth element doped optical fiber 4 connected at one end thereof by fusing. The measuring light emitted from the other end of the rare earth element-doped optical fiber 4 is incident into a quantity of light detector 5 to measure the quantity of light with a quantity of light measuring device 6 and the results thereof are stored into a data processor 7. Then, the rare earth element doped optical fiber 4 is cut by a proper length and the measuring light which is incident and emitted from a cut end face likewise is made incident into the quantity of light detector 5 and the results are stored into a data processor 7. The data processor 7 computes an amount of dope from a difference of quantity of light measured and an cut length L before and after the cutting of the rare earth element doped optical fiber 4.

76. 发明专利

JPH01145345A PRODUCTION OF CHLORINE-FREE GLASS FOR OPTICAL FIBER 失效
公开(公告)号：JPH01145345A
公开(公告)日：1989-06-07
申请号：JP30426087
申请日：1987-11-30
申请人： MITSUBISHI CABLE IND LTD
发明人： OMAE TOSHIKAZU , KIKUKAWA YOSHINORI , TANAKA HIROYUKI , ISHIJIMA TETSUO , SUZUKI TOSHIYA , KOO KAZUYA , SHINTANI TAKESHI
IPC分类号： C03B37/018 , C03B37/014
摘要： PURPOSE:To prevent the contamination of soot with C and to improve the productivity of the title glass, by synthesizing a soot by the flame-hydrolysis reaction using methyl silicate as a glass raw material, depositing the soot and converting the obtained porous preform into a transparent glass. CONSTITUTION:A glass raw material consisting of methyl silicate [Si(CH3O)4] is supplied to an oxyhydrogen flame to synthesize soot by flame-hydrolysis reaction. The soot is deposited on a seed rod. The porous preform produced by the above process is converted into a transparent glass by sintering to obtain the title glass.

77. 发明专利

JPH0197909A OPTICAL FIBER TAPE 失效
公开(公告)号：JPH0197909A
公开(公告)日：1989-04-17
申请号：JP25523387
申请日：1987-10-09
申请人： MITSUBISHI CABLE IND LTD
发明人： SUZUKI TOSHIYA , YOSHIDA MINORU , WATABE TAMISHIGE , TANAKA HIROYUKI
IPC分类号： G02B6/44
摘要： PURPOSE:To improve the optical transmission characteristic by forming a coating layer with two layers consisting of resins hardened by ultraviolet rays and specifying Young's modulus of the first inside coating layer and the second outside coating layer. CONSTITUTION:A first coating layer 21 and a second coating layer 22 are formed on the outside peripheral surface of an optical fiber 1 and consist of resins hardened by ultraviolet rays. Plural coated optical fiber 3 are arranged on a plane in parallel to form an optical fiber aggregate so that their outside peripheral surfaces are adjacent to one another, and this optical fiber aggregate is coated with a protective layer 4 as one body. The Young's modulus of the first coating layer 21 is set to and that of the second coating layer 22 is set to 40-60kg/mm . Thus, an optical fiber tape superior in temperature characteristic and lateral pressure characteristic is obtained.

78. 发明专利

JPH0196021A PRODUCTION OF BASE MATERIAL FOR OPTICAL FUNCTIONAL ELEMENT 失效
公开(公告)号：JPH0196021A
公开(公告)日：1989-04-14
申请号：JP25228787
申请日：1987-10-06
申请人： MITSUBISHI CABLE IND LTD
发明人： OMAE TOSHIKAZU , KIKUKAWA YOSHINORI , HAYASHI TOKUJI , YOSHIDA MINORU , TANAKA HIROYUKI , SHINTANI TAKESHI
IPC分类号： C03B8/04 , C03B37/014 , C03C13/04 , G02B6/00
摘要： PURPOSE:To obtain an optical fiber doped at high concn. and causing small loss by impregnating alcohol contg. a rare earth element into a porous base material formed by VAD, vitrifying the base material by sintering, and using the resulting glass base material. CONSTITUTION:A porous base material which is a half-sintered body of fine glass particles is formed by VAD. A soln. prepd. by dissolving 0.5-2wt.% NdCl3 in alcohol is impregnated into the porous base material. After the alcohol is evaporated by drying, the base material is vitrified by sintering.

79. 发明专利

JPS6472935A PRODUCTION OF SINGLE-CORE OPTICAL FIBER FOR IMAGE TRANSMISSION 失效
公开(公告)号：JPS6472935A
公开(公告)日：1989-03-17
申请号：JP22875087
申请日：1987-09-11
申请人： MARUBAYASHI HAJIME , OGIWARA HARUO , MITSUBISHI CABLE IND LTD
发明人： MARUBAYASHI HAJIME , OGIWARA HARUO , TAKADA SHINICHI , OMAE TOSHIKAZU , TANAKA HIROYUKI , SHINTANI TAKESHI
IPC分类号： C03B37/012 , G02B6/00
摘要： PURPOSE:To obtain the title fiber capable of blocking the transmission of an oblique light beam and transmitting only a meridian light beam by drawing an optical fiber preform obtained by sheathing a specified core base material with a quartz tube. CONSTITUTION:(A) The columnar soot to be used as the core base material for a graded index-type optical fiber is heated in gaseous He, and contracted to obtain a semi-sintered body. A grooved notch opened to the periphery of the semi-sintered body, having its depth in the radial direction of the semi- sintered body, and extending over the whole or a part of the longitudinal axis of the semi-sintered body is formed on the semi-sintered body. (B) A light absorbing sheet consisting of another semi-sintered body of soot previously doped with a light absorbing substance is inserted into the notch, and the material is heated in gaseous He and sintered to obtain the core base material. The core base material is sheathed with (C) a quartz tube to obtain an optical fiber preform, and the preform is drawn.

80. 发明专利

JPS63215529A APPARATUS FOR PRODUCING SYNTHETIC GLASS 失效
公开(公告)号：JPS63215529A
公开(公告)日：1988-09-08
申请号：JP4964787
申请日：1987-03-04
申请人： MITSUBISHI CABLE IND LTD
发明人： KIMURA KATSUHISA , ISHIKURA MASAYUKI , OMAE TOSHIKAZU , TANAKA HIROYUKI
IPC分类号： G02B6/00 , C03B8/00 , C03B8/04 , C03B37/014
摘要： PURPOSE:To efficiently add an additive at a low temperature and readily and economically carry out vitrification, by vitrifying a porous preform, provided in a furnace core tube and capable of rotating and lowering while thermally vaporizing the additive placed in a small-diameter part provided at the lower bottom of a furnace core tube and adding the vaporized additive to the preform. CONSTITUTION:A heater 6 which is the first heater for sintering is placed around an intermediate part of a sintering chamber 5 in which a seed rod 3, passing through a lid 4 and having a porous preform 2 mounted at the lower end thereof is placed in a cylindrical furnace core tube 1 consisting of quartz glass to constitute an apparatus for producing synthetic glass. An additive 8, e.g. NdCl3 or AlCl3, is then charged from a branched part 9 into a small- diameter part 7 provided at the lower end of the furnace core tube 1 using, e.g. a spoon. The branched part 9 is subsequently connected to an atmospheric gas feeder and an atmospheric gas, such as H2 or Cl2, is fed. A burner 10 is simultaneously ignited to heat the additive and the sintering chamber 5 is heated with the heater 6 to rotate and lower the porous preform 2 through the seed rod 3. The preform 2 is successively sintered from the lower end side and vitrified while adding the vaporized additive 8 to the preform 2.

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