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91. 发明专利

JPH0659152A OPTICAL FIBER COUPLER AND ITS PRODUCTION 失效
公开(公告)号：JPH0659152A
公开(公告)日：1994-03-04
申请号：JP21183592
申请日：1992-08-07
申请人： FUJIKURA LTD
发明人： TANAKA TAIICHIRO , KAWAKAMI NOBORU , YAMAUCHI RYOZO
IPC分类号： G02B6/28
摘要： PURPOSE:To improve mechanical strength and the strength to static stresses by preventing the direct adhesion of dust, etc., and the glass evaporated from a fusion stretching region to the surface of a bare optical fiber at the time of a fusion stretching operation. CONSTITUTION:This optical fiber coupler is constituted by forming a coating layer which can be removed by direct heating with an oxidative atmosphere on the coating removed part 3 near a fusion stretching part 4. Then, the reliability of a communication system is highly maintained over a long period when the optical fiber coupler is used in a transmission line.

92. 发明专利

JPH05286735A 失效
公开(公告)号：JPH05286735A
公开(公告)日：1993-11-02
申请号：JP8910392
申请日：1992-04-09
申请人： FUJIKURA LTD
发明人： TANAKA TAIICHIRO , YAMADA SHIGETOSHI , NOZAWA TETSUO , WADA AKIRA , YAMAUCHI RYOZO
IPC分类号： C03B37/012
摘要： PURPOSE:To improve yield by inserting a rod core member having a center core into a specified clad member, integrating both members by melting and melt-drawing the obtained preform. CONSTITUTION:An additive (e.g. GeO2) to increase the refractive index is added to a core preform, the preform is heated and drawn, and a core member 1, in which the refractive index of the center core 1a has a Gaussian distribution and the refractive index of the outer core 1b on the center core 1a is made uniform in the radial direction, is obtained. Meanwhile, a clad member obtained by adding a refractive index lowering additive such as fluorine to quartz uniformly in the radial direction and Which is formed into a rod is drawn, and a hole is allowed to pierce the center in the longitudinal direction to obtain a tubular clad member 2. The member 1 is inserted into the member 2, heated by a burner 3, melted and integrated to obtain a rod preform, and the preform is melt-drawn to produce a dispersion-shift optical fiber.

93. 发明专利

JPH04367539A OPTICAL FIBER 失效
公开(公告)号：JPH04367539A
公开(公告)日：1992-12-18
申请号：JP16640391
申请日：1991-06-11
申请人： FUJIKURA LTD
发明人： YAMAUCHI RYOZO , WADA AKIRA , NOZAWA TETSUO , TANAKA TAIICHIRO , SAKAI TETSUYA
IPC分类号： C03C13/04 , C03B37/014 , C03B37/025 , C03B37/029 , G02B6/02
摘要： PURPOSE:To lengthen a non-junction transmission distance by periodically changing structure parameters such as core diameter and refractive index in the longer direction of optical fiber and reducing nonlinear effects such as induced Brillouin scattering. CONSTITUTION:An optical fiber is formed in such a way that structure parameters such as core diameter, refractive index of core and strain remaining in core are periodically changed in the longer direction of the optical fiber. By the change in the structure parameter, Brillouin shift frequency is controlled and induced Brillouin scattering generated by longitudinal acoustic wave in glass is suppressed. Consequently, non-junction long-distance transmission of >=300Km is carried out by a light source of small spectrum width.

94. 发明专利

JPH04331738A PRODUCTION OF RARE EARTH METAL-ADDED OPTICAL FIBER 失效
公开(公告)号：JPH04331738A
公开(公告)日：1992-11-19
申请号：JP13050091
申请日：1991-05-02
申请人： FUJIKURA LTD
发明人： TANAKA TAIICHIRO , SAKAI TETSUYA , WADA AKIRA , YAMAUCHI RYOZO
IPC分类号： C03B37/014 , C03B37/018 , G02B6/00 , G02F1/35 , H01S3/06 , H01S3/07
摘要： PURPOSE:To provide a method for producing an optical fiber homogeneously mixed with a metal such as a rare earth metal and with Al. CONSTITUTION:A method for producing an optical fiber base material comprises a retaining part-forming process for forming a retaining part for an additive solution in a starting quartz tube, a soot-depositing process for depositing soot in the retaining part, an additive-doping process for doping the soot-deposited part with an additive, and finally a collapsing process. Since the rare earth metal and the Al can be added to the optical fiber base material in high concentrations, the wavelength-gain characteristics of the produced optical fiber are largely improved. Since the Al is also added in a high concentration, a co-operative.up.conversion effect is reduced in a light-amplifier using the optical fiber.

95. 发明专利

JPH04202029A METHOD FOR REINFORCING OPTICAL FIBER JUNCTURE 失效
公开(公告)号：JPH04202029A
公开(公告)日：1992-07-22
申请号：JP33279990
申请日：1990-11-29
申请人： FUJIKURA LTD
发明人： TANAKA TAIICHIRO , WADA AKIRA , YAMAUCHI RYOZO
IPC分类号： G02B6/255 , C03B37/15 , C03C25/42
摘要： PURPOSE:To allow the coating of a fusion spliced part where optical fiber surfaces are exposed with a carbon film of a uniform film thickness by heating the optical fibers while moving the fibers in a longitudinal direction, then controlling the output of a radiation type heat source so as to maintain the specified surface temp. of the heated part. CONSTITUTION:A CO2 laser beam 4 is first oscillated from an oscillator 1. The oscillated laser beam is passed through a quarter lambda plate 2 and is then passed through an EOM 5, by which the intensity of the CO2 laser beam 4 is controlled. The laser beam 4 after the passage through the EMO 5 is guided by reflected mirror, etc., onto the surface of a parabolic mirror 9. The laser beam 4 guided to the parabolic mirror 9 is condensed to one point on the surface of the optical fiber 12 in a chamber 7 and only this one point rises to a high temp. The atmosphere of the gaseous raw materials introduced from a gas introducing device 8 is maintained in the chamber 7 at this time. Then, the gaseous raw materials react on the optical fiber surfaces of the above- mentioned high-temp. part and the fiber surfaces are coated with the carbon film. The above-mentioned optical fibers are moved longitudinally by a traverser 13 in order to apply the uniform film on the surfaces thereof.

96. 发明专利

JPH0492825A PRODUCTION OF SILICA GLASS AND OPTICAL WAVEGUIDE USING SAME SILICA GLASS 失效
公开(公告)号：JPH0492825A
公开(公告)日：1992-03-25
申请号：JP21010290
申请日：1990-08-08
申请人： FUJIKURA LTD
发明人： TANAKA TAIICHIRO , WADA AKIRA , YAMAUCHI RYOZO
IPC分类号： G02B6/00 , C03B8/04 , C03B37/014 , C03C3/06 , C03C4/12 , C03C13/04
摘要： PURPOSE:To obtain the subject silica glass suitable for a fiber-type optic amplifier, etc., by doping a silica glass particle aggregate with Al and Er and sintering in a fluorine atmosphere while lowering the sintering temperature. CONSTITUTION:A silica glass fine particle aggregate (bulk density: preferably within a range of 0.4-0.7g/cm ) produced by the gas phase synthesis method is doped with Al and Er and then calcined (1400-1500 deg.C) in a fluorine atmosphere to obtain a silica glass doped with Al, Er and F. In case of producing an optical waveguide using the resultant glass, an inner core body is formed using the above-mentioned silica glass doped with Al, Er and F. An outer core layer composed of a glass material having a high refractive index than that of the above-mentioned silica glass doped with three components is formed on the outer periphery of the above-mentioned inner core body and a clad layer composed of a glass having a lower refractive index than that of the glass constituting the outer core layer is formed on the outer periphery thereof.

97. 发明专利

JPH0442819A PRODUCTION OF RARE EARTH DOPED GLASS 失效
公开(公告)号：JPH0442819A
公开(公告)日：1992-02-13
申请号：JP14679290
申请日：1990-06-05
申请人： FUJIKURA LTD
发明人： TANAKA TAIICHIRO , WADA AKIRA , OUCHI YOSHIHIRO , SAKAI TETSUYA , YAMADA NARUTOSHI , YAMAUCHI RYOZO
IPC分类号： C03B8/00 , C03B8/04 , C03B37/014 , C03C3/06
摘要： PURPOSE:To obtain a rare earth doped glass enabling uniform dope of rare earth element and capable of simplifying production process by heating an aggregate of glass fine grains in a rare earth element compound gas atmosphere formed in a specific manner. CONSTITUTION:An atomized article of a rare earth element compound solution S is jetted from a nebulizer 13 and sprayed onto the surface of soot 11 rotating and simultaneously reciprocating in the vertical direction. Then the atomized article of the rare earth element compound is uniformly attached onto the surface of soot 11 by several reciprocations of the soot 11. The soot is dried in dried nitrogen stream, etc., to remove water content of soot. Then the soot 11 to which the rare earth element compound is attached is housed in a heating furnace 14 in which temperature gradient distribution in a closed state is formed, and then the heated rare earth element compound is sublimed. Thereby the inside of a heating furnace 14 is kept to the gaseous atmosphere of the rare earth element compound and simultaneously soot 11 is sintered. According to this production method of glass, it is not required to previously dehydrate the rare earth element compound and most water is removed in the drying process after attaching of the rare earth element compound solution onto the soot and removed also in sublimation thereof.

98. 发明专利

JPH03269522A AMPLIFIER DEVICE FOR WAVELENGTH MULTIPLEX OPTICAL TRANSMISSION LINE 失效
公开(公告)号：JPH03269522A
公开(公告)日：1991-12-02
申请号：JP7028990
申请日：1990-03-20
申请人： FUJIKURA LTD
发明人： YAMAUCHI RYOZO , WADA AKIRA , TANAKA TAIICHIRO
IPC分类号： G02F1/35 , H01S3/07 , H01S3/17 , H04J14/00 , H04J14/02
摘要： PURPOSE:To allow the execution of amplification by optical amplification in the optical transmission line of wave length multiplex optical communication by transmitting light rays of plural wavelengths by respectively one each to each of auxiliary transmission lines and providing optical amplifiers which optically amplify the transmitted ligth rays thereof to the auxiliary transmission lines. CONSTITUTION:Two pieces of multiplexing/demultiplexing elements 12, 13 are disposed in series in the main optical transmission line 11 where the light of the plural wavelengths is transmitted. The plural auxiliary transmission lines 14 corresponding to the number of the wavelengths are provided between these multiplexing/demultiplexing elements. The light rays of the plural wavelengths are transmitted respectively by one each to each of these auxiliary transmission lines 14 and the optical amplifiers 15 which optically amplify the transmitted light rays thereof are provided in these auxiliary transmission lines 14. The equipment devices for wavelength multiplex optical communication are simplified and the optical amplifier having high reliability is obtd.

99. 发明专利

JPH03265532A PRODUCTION OF OPTICAL FIBER PREFORM DOPED WITH RARE EARTH ELEMENT 失效
公开(公告)号：JPH03265532A
公开(公告)日：1991-11-26
申请号：JP6660790
申请日：1990-03-16
申请人： FUJIKURA LTD
发明人： TANAKA TAIICHIRO , SAKAI TETSUYA , YAMADA SHIGETOSHI , OUCHI YOSHIHIRO , WADA AKIRA , YAMAUCHI RYOZO
IPC分类号： G02B6/00 , C03B37/012 , C03B37/014 , C03B37/018
摘要： PURPOSE:To inhibit the crystallization and deposition of a rare earth element and to obtain an optical fiber preform doped with the rare earth element at high concn. by rotating a core glass rod doped with the rare earth element in the axial direction, etching the surface of the rod by a specified method, depositing fine glass particles on the etched surface and carrying out sintering. CONSTITUTION:A core glass rod 1 doped with a rare earth element is rotated in the axial direction, an etching gas is fed into a plasma jet flame 3 generated with a plasma torch 2 and this torch 2 is traversed plural times along the longitudinal direction of the rod 1 to etch the surface of the rod 1. At the time of the final traverse, the etching rate is reduced. Fine glass particles for a clad are then deposited on the etched surface of the rod 1 and sintered to obtain an optical fiber preform doped with the rare earth element.

100. 发明专利

JPH02252632A PRODUCTION OF OPTICAL FIBER PREFORM 失效
公开(公告)号：JPH02252632A
公开(公告)日：1990-10-11
申请号：JP7238989
申请日：1989-03-24
申请人： FUJIKURA LTD
发明人： HORIKOSHI MASAHIRO , YAMAUCHI RYOZO , MIYAMOTO SUEHIRO , NISHIDE KENJI , TANAKA TAIICHIRO , OUCHI YOSHIHIRO , YAMADA SHIGETOSHI
IPC分类号： G02B6/00 , C03B37/014 , C03B37/016
摘要： PURPOSE:To improve the strength and weather resistance of the subject preform by depositing glass soot on a glass for optical fiber to form a porous glass preform, impregnating a sol produced by the hydrolysis of a specific alkoxide mixture into said porous preform and making the preform transparent by heating in two stages. CONSTITUTION:A quartz glass rod is polished with an oxyhydrogen flame and soot of SiO2 glass is deposited on the rod to form a porous glass preform. Separately, 1mol of a mixture of an Si alkoxide and a Zr and/or Ti alkoxide is hydrolyzed by adding 4mol of an alcohol, 5mol of water and a catalyst such as hydrochloric acid to form a sol. The above porous glass preform is immersed into the sol, pulled up, gelatinized at about 60 deg.C. heated in O2 or an O2- containing mixed gas atmosphere at =1000 deg.C in He, O2 or a Cl2-containing mixed He gas atmosphere to obtain the objective amorphous quartz optical fiber preform having the outermost amorphous coating layer containing ZrO2 and/or TiO2 and having higher melting point and lower expansion coefficient than those of the core and clad glass.

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