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1. 发明专利

JPS56164028A PRODUCTION OF HIGH-PURITY BASIC MATERIAL FOR GLASS 失效
公开(公告)号：JPS56164028A
公开(公告)日：1981-12-16
申请号：JP6853080
申请日：1980-05-23
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： EDAHIRO TAKAO , MIYAMOTO SUEHIRO , YAMAUCHI RIYOUZOU
IPC分类号： C03B37/018 , C03B8/04 , C03B19/14 , G02B6/00
摘要： PURPOSE:A supporting bar with an annular cross section perpendicular to the axis direction is rotated within a surface perpendicular to the axis direction by means of the holding part and a burner is set right beneath the rotation center, the supporting bar is shifted in the sliding direction to the holding part to increase the uniformly of the growing end of the basic material and give the cross section an arbitrary form. CONSTITUTION:The revolution of shaft 21 causes the rotation of holding part 2. A burner 4 is set on the extention of the revolution shaft and the gas of raw materials of glass, a combustible gas and a combustion-aiding gas are sent to the burner. The resultant glass particles are piled on the lower end of the supporting rod 1 to grow in the porous glass basic material 3. While the porous glass basic material grows, the supporting rod is rotated with the motor 22, thus the basic material becomes a pipe. Then, the motor is stopped and only the revolving shaft 21 is driven so that the one point in the ring is set right above the burner 4, whereby the porous glass basic material 3 grows faithfully in a cylindrical form at the point.

2. 发明专利

JPS6063403A STRAIN MEASURING METHOD OF OPTICAL FIBER 失效
公开(公告)号：JPS6063403A
公开(公告)日：1985-04-11
申请号：JP17214984
申请日：1984-08-18
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： UCHIDA NAOYA , YAMAUCHI RIYOUZOU , KANBARA YASUYUKI , KOBAYASHI TOSHIAKI , INADA KOUICHI
IPC分类号： G02B6/00 , G01B11/16
摘要： PURPOSE:To measure accurately true elongation even if an optical fiber is twisted in a cable or is laid in a complicated shape, by establishing a certain relation between the delay of propagation time of light due to elongation of the optical fiber and an elongation DELTAL of the optical fiber. CONSTITUTION:The light modulated by a sine wave signal modulator 24 is made incident to an optical fiber 10. At this time, a sine wave signal A2 obtained by not allowing the light to pass the optical fiber but allowing it to pass an attenuator 26 is superposed onto an output A1 of a photodetector 16 and is inputted to a spectrum analyzer 28. Sweep is performed with a modulating frequency (f), and the level of the synthesized signal in the frequency is measured by a frequency synchronized with the frequency. The synthesized signal A1+A2 is described as the output of the spectrum analyzer 28 on a cathode-ray tube. A delay time variation DELTAgamma is obtained as DELTAgamma=(f'0-f0)/2f0 in accordance with the first zero point f0 and a frequency f'0, which generates a strain in the optical fiber 10 and gives a new zero point when the propagation time of the optical signal becomes gamma1+DELTAgamma, on the frequency base. Consequently, DELTAgamma is measured to obtain the elongation DELTAL.

3. 发明专利

JPS57138711A CABLE STRUCTURE 失效
公开(公告)号：JPS57138711A
公开(公告)日：1982-08-27
申请号：JP2334581
申请日：1981-02-19
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： KATSUYAMA YUTAKA , SHIODA TAKAO , FUKUDA TAKERU , INADA KOUICHI , YAMAUCHI RIYOUZOU
IPC分类号： H01B7/295 , G02B6/44 , H01B7/42

4. 发明专利

JPS56145127A PREPARATION OF BASE MATERIAL FOR GLASS FIBER 失效
公开(公告)号：JPS56145127A
公开(公告)日：1981-11-11
申请号：JP4776380
申请日：1980-04-11
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： EDAHIRO TAKAO , MIYAMOTO SUEHIRO , YAMAUCHI RIYOUZOU
IPC分类号： C03B37/018 , C03B37/014 , G02B6/00
摘要： PURPOSE:To form a porous clad layer of a base material for optical fibers by burning a mixture of SiCl4 gas for forming the clad layer with H2 gas and O2 gas from the bottom with a burner while rotating a pipelike rod, and passing GeCl4 gas for controlling the refractive index from above simultaneously through the rod. CONSTITUTION:A mixture gas of H2 with O2, SiCl4 Ar, etc. is fed from the bottom burner 22 while rotating and lifting a support rod 21 of a pipelike base material, and the temperature is increased with an oxyhydrogen flame to decompose and oxidize the SiCl4. GeCl4 gas for controlling the refractive index is introduced from above with Ar gas at the same time to form a porous clad layer 23 as a base material for optical glass fibers having a refractive index controlled at the desired value on the support rod 21. In the process, a dehydrating gas, e.g. Cl2, is simultaneously fed to give the anhydrous porous clad layer 23 as the base material.

5. 发明专利

JPS56120534A MANUFACTURING APPARATUS FOR OPTICAL FIBER 失效
公开(公告)号：JPS56120534A
公开(公告)日：1981-09-21
申请号：JP2324280
申请日：1980-02-26
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： EDAHIRO TAKAO , YAMAUCHI RIYOUZOU , MIYAMOTO SUEHIRO
IPC分类号： C03B37/018 , C03B37/014 , G01B11/00 , G02B6/00
摘要： PURPOSE:To control the position of a preform growing point with accuracy by irradiating a light beam to the tip part of a growing preform and detecting the quantity of light passed in the manufacture of a preform for an optical fiber by a vapor axial deposition method. CONSTITUTION:Laser beam 41 s irradiated from oscillator 41 to preform 12 pulled up with rotation through seed rod 11 attached to motor 20 on pulling stand 19 so that part of beam 42 is shielded by the tip part of preform 12. Beam 42 is then introduced into light detector 44 through interference filter 43 for removing light from a flame formed with burner 13, and the value is compared to signal E0/2 (E0 is the output of detector 44 in the case where beam 42 is not shielded by preform 12) from a reference voltage generator with comparator 45. In accordance with the deviation voltage, pulling motor 17 is actuated through motor control circuit 16 to control the position of preform 12 so that the center line of beam 42 is passed through the tip part of preform 12.

6. 发明专利

JPS56120533A OBSERVING APPARATUS FOR VITRIFICATION REACTION 失效
公开(公告)号：JPS56120533A
公开(公告)日：1981-09-21
申请号：JP2202580
申请日：1980-02-22
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： NAKAHARA MOTOHIRO , YAMAUCHI RIYOUZOU , MIYAMOTO SUEHIRO
IPC分类号： C03B37/018 , C03B37/014 , G01N15/00 , G01N21/49 , G02B6/00
摘要： PURPOSE:To effectively observe vitrification reaction by detecting the scattered light of a laser beam irradiated into a flame for the vitrification reaction to obtain the particle density distribution of fine glass powder formed in the flame. CONSTITUTION:A flame is formed by burning a gas fed from feed system 2 with burner 1, and a laser beam is irradiated into the flame from irradiator 3 through chopper 4 at an almost right angle to central axis 0 of burner 1. While moving burner 1 right and left, scattered light due to glass fine powder formed in the flame is detected with light detector 6 through interference filter 5 for removing light emitted by the flame itself, and the output is introduced into amplifier 7 synchronized with chopper 4 to measure the intensity of scattered light at each position in the flame. The density distribution of glass fine powder in the radius direction of the flame is then obtd. from the value to observe the state of the vitrification reaction in the flame, and gas feeder 2 is regulated with controller 8, or an alarm is given from alarm device 9.

7. 发明专利

JPS5673640A MANUFACTURE OF POROUS GLASS PREFORM FOR OPTICAL FIBER 失效
公开(公告)号：JPS5673640A
公开(公告)日：1981-06-18
申请号：JP14813779
申请日：1979-11-14
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： EDAHIRO TAKAO , MORIYAMA TAKASHI , YAMAUCHI RIYOUZOU , SANADA KAZUO , FUKUDA TAKERU
IPC分类号： C03B37/014 , G02B6/00
摘要： PURPOSE:To reduce the optical absorption loss of a porous glass preform by adjusting hydrogen as starting material for a flame to a specified vol. and specifying the distance between the tip of a burner and a growing preform in the manufacture of the preform by a vapor phase axial sticking method. CONSTITUTION:Glass forming metal halide is fed to a burner together with oxyhydrogen to form glass fine powder in a flame, and this powder is successively deposited on the tip of a movable rodlike substrate to manufacture a porous glass preform for an optical fiber. At this time, the vol. of hydrogen fed is adjusted to 2.5-4l/min, and the distance between the tip of the burner and a growing preform is kept at 30-50mm. to reduce the amount of OH groups mixed into the fiber base material. As a result, the resulting preform has a reduced optical absorption loss.

8. 发明专利

JPS5645845A PRODUCING DEVICE OF OPTICAL FIBER 失效
公开(公告)号：JPS5645845A
公开(公告)日：1981-04-25
申请号：JP12164379
申请日：1979-09-20
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： INAGAKI NOBUO , YAMAUCHI RIYOUZOU , ARAKI SHINJI
IPC分类号： C03B37/018 , G02B6/00
摘要： PURPOSE:To make the outside diameter of a glass tube constant by providing a feedback loop of detecting the amount of the gas to be blown into the chamber for capturing the exhaust gas of a starting glass tube with a flow rate controller and the ouside diameter of the glass tube with a detector and controlling the flow rate controller according to the detection value. CONSTITUTION:A fuel gas is fed from a fuel gas supplying device 45 into a starting glass tube 41 within an optical fiber producing device of an internal CVD method, and is heated with a burner 43. The exhaust gas from the glass tube 41 is temporarily captured in a chamber 47 and is fed into an exhaust gas treating chamber 49 via a damper 48. On the other hand, the outside diameter of the glass tube is detected with an outside diameter detector 51 and is compared with the preset outside diameter in a comparator 52. The deviation thereof is amplified with an amplifier 54, is fed to a flow rate controller 55 which is turn controls the amount of the gas blown into the chamber by the feedback loop. Thereby, the pressure in the glass tube is controlled constant and the tube diameter is made constant.

9. 发明专利

JPS5875110A OPTICAL BRANCHING DEIVCE AND MEASURING METHOD USING SAID OPTICAL BRANCHING DEVICE 失效
公开(公告)号：JPS5875110A
公开(公告)日：1983-05-06
申请号：JP17359881
申请日：1981-10-28
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： TOKUDA MASAMITSU , YAMAUCHI RIYOUZOU , WATANABE KOU , CHIGIRA SADAO
IPC分类号： G01M11/00 , G02B6/28
摘要： PURPOSE:To obtain an optical branching device of a low loss, which is applicable to a loop-like transmission line without a problem, by constituting so that an end face of 2 optical fibers is cut at a prescribed angle against the center axis, and a half-mirror is directly formed on one end face and is junctioned with the other end face. CONSTITUTION:As for optical fibers 51, 52, its end face is cut at an angle of about 45 deg. against the ceter axis, and is polished. Subsequently, on the end face of the optical fiber 51, a half-mirror 53 consisting of a metallic film and a dielectric layer and having optional reflection and transmission characteristics is formed, and the end face of the other optical fibers 52 is butted to this half- mirror 53 so that the optical axes coincide and is stuck by an adhesive. An insertion loss to the optical fiber 52 from the optical fiber 51 becomes the same extent as that which has connected a regular optical fiber, except a loss of a portion which has been made to branch by reflection of the half-mirror 53, and when this optical branching device is applied to a loop-like optical transmission line, a stable system of a low loss can be constituted.

10. 发明专利

JPS57209839A MANUFACTURING OF OPTICAL FIBER 失效
公开(公告)号：JPS57209839A
公开(公告)日：1982-12-23
申请号：JP9254481
申请日：1981-06-16
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： SENDA KAZUNORI , MIYAMOTO SUEHIRO , SHIODA TAKAO , YAMAUCHI RIYOUZOU , SANADA KAZUO
IPC分类号： C03B37/018 , C03B37/014 , C03C15/00 , G02B6/00
摘要： PURPOSE:To manufacture an optical fiber having low light-transmission loss, by etching the surface of a core-forming porous glass preform formed on a rod with the flame of an oxyhydrogen burner fed with a fluoride-containing gas, and at the same time, depositing glass soot to the rod to form the clad of the optical fiber. CONSTITUTION:An oxyhydrogen flame burner 1 having a multiple-wall structure is supplied with a glass-forming gas, H2 gas, O2 gas, Ar gas, etc. separately. The formed glass soot such as SiO2, P2O5, GeO2, etc. is deposited to the lower end of the rod 2 which is rotated around its axis and shifted upward, to form a porous glass preform 3 which forms the core of an optical glass fiber. The preform is heated, according to its growth, with the flames of the second and the third oxyhydrogen flame burners 4 and 5 having multiple-wall structure and placed above the burner 1. The burner 4 is supplied with a fluoride gas together with H2 gas, O2 gas and Ar gas and etches the surface of the preform 3 to obtain a porous glass preform 3' having clean surface. Glass soot is deposited to the preform 3' with the burner 5 to obtain a porous glass preform 6 which forms the clad of the optical glass fiber.

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