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1. 发明专利

JPS58172611A AXIAL ALIGNING METHOD OF OPTICAL FIBER 失效
公开(公告)号：JPS58172611A
公开(公告)日：1983-10-11
申请号：JP5511682
申请日：1982-04-02
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD , SUMITOMO ELECTRIC INDUSTRIES , FUJIKURA LTD
发明人： TATSUTA MITSUHIRO , KATOU YASUYUKI , YANAGAWA HISAHARU , TATEGAMI SHIGERU , YOSHIDA YUKIO , TSUCHIDA YOSHIO , TODA YUUICHI , WATANABE KOU
IPC分类号： G02B6/24 , G02B6/38
摘要： PURPOSE:To align the axes of optical fibers, by applying elastic deformation to beams placed thereon with a pair of optical fibers to be aligned axially thereby applying the displacement to the optical fiber. CONSTITUTION:The length l from a point of application up to the bottom surface of supporting columns 2, 3 is so set that the columns do not deflect largely even if external force W2 is exerted at the forward ends of beams 4, 4 to be placed thereon with fibers. Thus, the displacement only in the x-axis direction is obtained by the external force W2 in the y-axis direction, while the displacement in the x-axis direction is developed distinctly by the external force W1 in the x-axis direction. When th point of application of the external force W1 to be exerted in the x-axis direction is selected at the point P2 located near the corner angle part in the upper part of the columns 3, 3, the forware end O of V-grooves 5, 5 displaces to O', but optical fibers f, f' slip merely on the beams 4, 4; therefore, the displacement in the z-axis direction is not generated in the fibers f, f', Thus, the displacement in the biaxial directions are applied to the optical fibers by exerting the external force on the beam 4, 4 and the columns 3, 3 in the above-mentioned way, whereby the optical fibers are aligned exactly axially without any alignment errors even if the end face of said fibers have a cutting angle, hence the loss of connection is decreased.

2. 发明专利

JPS60184207A CUTTER OF OPTICAL FIBER 失效
公开(公告)号：JPS60184207A
公开(公告)日：1985-09-19
申请号：JP4096484
申请日：1984-03-03
申请人： FUJIKURA LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA TAKESHI , OOSATO KAZUKUNI , KOYAMA KAZUHIRO , WATANABE KOU , HAIBARA TADASHI
IPC分类号： B26F3/00 , B26D7/08 , C03B37/16 , G02B6/00 , G02B6/25
摘要： PURPOSE:To obtain a good cut face without an individual difference by bringing a semicircular edge into contact with a fiber strand to scratch it on the way of the circular motion in a plane vertical to the fiber strand in a middle position between both clamps. CONSTITUTION:A coating part 12 in the end part of an optical fiber core 10 is peeled and is put in a groove 30, and a strand 14 is put in a groove 50, and the end part of the coating part 12 is applied to a stopper 36, and a retainer 38 is lowered to hold it. Solenoids 32 and 52 are operated to close a coating clamp 20 and a strand clamp 40, and the coating part 12 and the fiber strand 14 are caught in respective grooves. Next, a motor 64 is rotated, and the fiber strand 14 is scratched with an edge 72, and the strand 14 is slightly bent and curved when the edge 72 is brought into contact with the fiber strand 14, and the edge 72 is slightly moved backward while compressing a spring 76. Next, a motor 96 is rotated, and a pushing tool 88 is moved forward and is applied to the strand 14 from the direction vertical to the strand 14, and a bending stress is applied to it to break it.

3. 发明专利

JPS6061703A METHOD FOR DETECTING CORE SHAFT SHIFT OF FIBER 失效
公开(公告)号：JPS6061703A
公开(公告)日：1985-04-09
申请号：JP17082583
申请日：1983-09-16
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： KAWADA OSAMU , HOSHINO KOUICHI , ISHIHARA HIROSHI , WATANABE KOU
IPC分类号： G02B6/24 , G02B6/38
摘要： PURPOSE:To derive exactly a position shift and a center position of a core by taking a correlation of a waveform of each point based on one of observed waveforms or a waveform prepared in advance, as a reference waveform, with regard to a signal component in the vicinity of the core center part from an observed picture signal. CONSTITUTION:A light source 41 is place on an axis making a right angle against axes of fibers A, B, a microscope 11 consisting of an objective lens 42 and an eyepiece 43 is placed at a position of the opposite side of the fiber, an obtained fiber image is converted to a picture signal by a video camera 45, and thereafter, by scanning in the vertical direction of the fiber axis, picture signals Va, Vb...Vn scanned in the direction vertical to the fiber axis at each point of a-a', b-b'..., n-n' when the fibers to be connected A, B are observed in the axial direction are derived. The center position of the fiber is derived only as to a specified observing signal waveform, for instance, Va, and only a signal of a suitable interval part of both its sides is extracted. The axis shift quantity in the vicinity of the connecting point can be derived by a shift quantity beween the productions in the connecting center point, when the position shift of at least two points by each fiber A, B, total four points becomes clear.

4. 发明专利

JPS6045207A METHOD FOR CONNECTING OPTICAL FIBER 失效
公开(公告)号：JPS6045207A
公开(公告)日：1985-03-11
申请号：JP15282783
申请日：1983-08-22
申请人： FUJIKURA LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： SHIODA TAKAO , WATANABE KOU , MIYAJIMA YOSHIAKI , KASHIMA GIYUU
IPC分类号： G02B6/24 , G02B6/255 , G02B6/36
摘要： PURPOSE:To connect easily optical fibers without requiring the selection of the working site by using an oxyhydrogen flame contg. a halogen compound. CONSTITUTION:Gaseous O2 and gaseous SF6 are fed to an oxyhydrogen burner having a double-tubed structure. Gaseous H2 is fed to the outer tube, the tip of the burner and optical fibers are set at 2mm. interval to preheat the fibers, and the fibers are melted and connected with the gaseous O2 and gaseous SF2. After the connection, surface hydroxyl groups are removed from the connected part and its vicinities by surface treatment. This surface treatment is carried out at a low temp. so as to prevent the corrosion of the surface of the connected fiber with HF produced in the oxyhydrogen flame. The exposed part of the resulting optical fiber including the connected part is coated with epoxy resin which is the coating material of the original optical fibers, and the resin is crosslinked with ultraviolet rays to reinforce the optical fiber. In this method, a gaseous or liq. halogen compound having a hydroxyl group removing effect and high stability at ordinary temp. is added to an oxyhydrogen flame in place of conventional gaseous chlorine having the same effect.

5. 发明专利

JPS58123513A CLAMP MECHANISM OF OPTICAL FIBER CORE 失效
公开(公告)号：JPS58123513A
公开(公告)日：1983-07-22
申请号：JP650282
申请日：1982-01-19
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： KASHIMA GIYUU , WATANABE KOU , OOSATO KAZUKUNI , YAMADA TAKESHI
IPC分类号： G02B6/24 , G02B6/255 , G02B6/38
摘要： PURPOSE:To push a fiber strand to the right position in a V groove by making a coated part straight, even if the coated part is bent, by pushing coated fiber down by lowering a coating clamp at first, and then by pushing a fiber strand down by lowering a core clamp. CONSTITUTION:A fiber strand 26 is put in a V groove 12 and a coated fiber 28 is put in a groove 18, and the coated fiber 28 is pushed down by lowering a coating clamp 22 at first and then the fiber strand 26 is pushed down by lowering a strand clamp 20. By placing a bent fiber core, the strand 26 is caught by an oblique side 35 of a notch 34 of a guide 30 and the end part of the coated fiber 28 is made so as to rise from the groove 18. When the clamp 22 is lowered, the coated fiber 28 is pushed down, and the strand 26 slides down along the oblique side 35 as expressed by an arrow and drops into a slit 36. The coated fiber 28 is also stored in the groove 18 automatically and is pushed down by the clamp 22.

6. 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.

7. 发明专利

JPS6043616A OBSERVING METHOD OF OPTICAL FIBER IN WELDING CONNECTION DEVICE 失效
公开(公告)号：JPS6043616A
公开(公告)日：1985-03-08
申请号：JP15269283
申请日：1983-08-22
申请人： FUJIKURA LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA TAKESHI , WATANABE KOU , OOSATO KAZUKUNI , SUZUKI MASAO , IMON KENGO , MATSUMOTO MICHITO
IPC分类号： G02B6/24 , G02B6/255 , G02B6/36 , G02B6/38
摘要： PURPOSE:To observe a direct image and a reflected image of an optical fiber simultaneously by single-time focusing by putting a transparent medium which is larger than air in refractive index and has a specific length along an optical path in the optical path. CONSTITUTION:The direct image 10a when the abutting part of the optical fiber 10 is seen directly from above and the reflected image 10b when it is viewed horizontally through a mirror 14 are observed simultaneously through a microscope 11, and the transparent medium 20 which is larger in refractive index than air and has the specific length along the optical path is put in the optical path extending from the optical fiber 10 to an objective lens 12 through the mirror 14. Then, the optical path length from the optical fiber 10 directly to the objective lens 12 is equalized substantially to the optical path length from the optical fiber 10 to the objective 12 through the mirror 14, and the direct image 10 and reflected image 10b are observed simultaneously by putting in focus once.

8. 发明专利

JPS5821709A CONNECTING METHOD FOR SINGLE MODE OPTICAL FIBER 失效
公开(公告)号：JPS5821709A
公开(公告)日：1983-02-08
申请号：JP12084681
申请日：1981-07-31
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： TATSUTA MITSUHIRO , KATOU YASUYUKI , AOUMI YOSHIYUKI , YAMADA TAKESHI , WATANABE KOU , OOSATO KAZUKUNI , ARAI TAKATOSHI
IPC分类号： G02B6/24 , G02B6/255
摘要： PURPOSE:To make the end parts of cores melt-stickable by heating while aligning the cores axially by using an analyzer assuming crossed nicols with a polarizer thereby obtaining the transmitted images of the cores suitably and magnifying the transmitted images of the cores properly. CONSTITUTION:Light of a lamp 21 is irradiated through a polarizer 22 to the side to both end parts of the two single mode optical fibers 11, 12 to be connected, and the transmitted light thereof is conducted to an analyzer 24. Crossed nicols are constituted by the pllarizer 22 and the analyzer 24. Then the stresses and strains remaining in the fibers appear as images on acocount of an photoelastic effect and the images of the cores are obtained. The analyzer 24 is disposed in the eyepiece part of a microscope 23, and the images of the cores are converted to electric signals with line sensors 25. Mirrors 26, 26 for reflection are opposed at approximately right angles to the optical paths connecting the lamp 21 and the microscope 23, and the position deviations in the X- and Y- directions are detected with the two line sensors 25, 25. After the cores are aligned axially in such a way, the mirrors 26, 26 are retreated, and arc discharge is generated between electrodes 27 and 27 to heat both end parts of the fibers 11, 12, whereby said parts are melt-stuck and connected.

9. 发明专利

JPS5811912A CONNECTING METHOD FOR SINGLE MODE FIBER BY MELT-STICKING 失效
公开(公告)号：JPS5811912A
公开(公告)日：1983-01-22
申请号：JP11129181
申请日：1981-07-16
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： KATOU YASUYUKI , TATSUTA MITSUHIRO , AOUMI YOSHIYUKI , YAMADA TAKESHI , WATANABE KOU , OOSATO KAZUKUNI , ARAI TAKATOSHI
IPC分类号： G02B6/24 , G02B6/255
摘要： PURPOSE:To obtain a method for melt-sticking fibers with superior connection loss characteristics and tensile strength by arranging plural pairs of heating electrodes in the length direction of a fiber and melt-sticking single mode fibers. CONSTITUTION:Two pairs of opposing electrodes 21, 22 and 31, 32 are arranged in the length direction of fibers 20 and connected to an AC power source 5. A pair of fibers 20, 20 are heated and melt-stuck by generating arc discharge between these opposing electrodes 21, 22 and 31, 32. Thus, fibers with superior connection loss characteristics and tensile strength are obtained.

10. 发明专利

JPS6095506A ALIGNING DEVICE FOR OPTICAL FIBER AXIS 失效
公开(公告)号：JPS6095506A
公开(公告)日：1985-05-28
申请号：JP20442783
申请日：1983-10-31
申请人： NIPPON TELEGRAPH & TELEPHONE , FUJIKURA LTD
发明人： KAWADA OSAMU , HOSHINO KOUICHI , ISHIHARA HIROSHI , YAMADA TAKESHI , WATANABE KOU
IPC分类号： G02B6/26 , G02B6/255
摘要： PURPOSE:To align the axes of cores to each other accurately by making a position adjustment by jogging a microscope and a light source so that the microscope and light source has invariably the same position relation. CONSTITUTION:The light source 11 and microscope 14 are jogged and positioned in an (y) direction for vertical observation so that the light source 11, optical fiber 11, and microscope 14 are arranged vertically in a line. Then, the microscope is jogged in an (x) direction and positioned so that the distance between fiber center points is f0 determined by the focal length. There are two optical fibers 1 and 2 to be connected and their relative axis shift is normally several microns, so only one optical fiber is adjusted. In this state, the core positions of the two fibers are observed to detect the axis shift extent of the cores, and an optical fiber support base 4 is moved so that the axis shift is eliminated, attaining the alignment.

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