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1. 发明专利

JPS5651635A MEASURING METHOD FOR MATERIAL DISPERSION OF OPTICAL FIBER 失效
公开(公告)号：JPS5651635A
公开(公告)日：1981-05-09
申请号：JP12715679
申请日：1979-10-01
申请人： NIPPON TELEGRAPH & TELEPHONE , SUMITOMO ELECTRIC INDUSTRIES
发明人： TOKUDA MASAMITSU , IWASAKI KEIICHIROU
IPC分类号： G01M11/02 , G01M11/00
摘要： PURPOSE:To make it possible to take a separate measurement of only the effect of material dispersion with high precision by causing two beams, amplitude-modulated by a single sine wave, to strike optical fiber simultaneously and by measuring the phase difference between modulated signals by selectively detecting those signals. CONSTITUTION:Light of wavelength lambdai from a light source and polarizing device 2, when passing through external modulator 3, is amplitude-modulated into a sine shape with a signal from electric signal generator 5 simultaneously with light of wavelength lambdao from single-wavelength light source 1. Two lights of lambdao and lambdai are mixed into one by synthesizer 4 before striking optical fiber 6. The light having propagated through optical fiber 6 is polarized by polarizer 7 so that light of lambdao will reach detector 8 and that of lambdai will reach detector 9. Electric signals obtained by detectors 8 and 9 are supplied to phase difference measurer 10 to measure their phase difference, on the basis of which the effect of material dispersion is found.

2. 发明专利

JPS5657015A OPTICAL FIBER CONNECTION METHOD AND DEVICE 失效
公开(公告)号：JPS5657015A
公开(公告)日：1981-05-19
申请号：JP13397579
申请日：1979-10-16
申请人： NIPPON TELEGRAPH & TELEPHONE , SUMITOMO ELECTRIC INDUSTRIES
发明人： MATSUMOTO MICHITO , IWASAKI KEIICHIROU , TAKIMOTO HIDEYUKI
IPC分类号： G02B6/36
摘要： PURPOSE:To make it possible to transmit the photosignal from a rotating material to a fixed material, by connecing respective optical fibers, which are fixed to centers of the rotating jack and the fixed jack, rotatably to the plug through the bearing coaxially. CONSTITUTION:Rotary moving fiber 11 has the center axis matched to jack 12 and is fixed. Here, jack 12 is held by the plug with a minimum friction by ball bearing held coaxially by pawl 14 inside plug 15. Meanwhile, fixed fiber has the center axis matched to jack 12' and is fixed. Jack 12' is inserted into the plug by screw 17. Ball bearing 13' held coaxially by pawl 14 is fitted to one face of jack 12', and jack 12' is screwed until it is brought into contact with the other jack 12. By this constitution, a rotatable optical fiber connection device can be obtained.

3. 发明专利

JPS5643609A OPTICAL FIBER BRANCHING DEVICE 失效
公开(公告)号：JPS5643609A
公开(公告)日：1981-04-22
申请号：JP12122979
申请日：1979-09-19
申请人： NIPPON TELEGRAPH & TELEPHONE , SUMITOMO ELECTRIC INDUSTRIES
发明人： MIYAUCHI MITSURU , IWASAKI KEIICHIROU
IPC分类号： G02B6/28 , G02B6/34
摘要： PURPOSE:To increase the coupling effect between optical fibers by providing light scattering sources periodically at an equal interval in the longitudinal direction etc. of an optical fiber, disposing the fiber of the same constitution as that thereof and so constituting these that the part between both fibers is dipped in matching liquid. CONSTITUTION:Coupling regions 7 are provided periodically at an equal interval to optical fibers 5, 6, and both fibers 5, 6 are disposed parallel and are then dipped in matching liquid 8 such as organic solvent. The coupling regions 7 can be formed by cutting off the clad part partially by, for example, arc discharge. It is also possible to use cutting away of the clad part by a chemical etching method or changing of the refractive index of the clad part by an ion irradiation. Thereby, the coupling effect between the two fibers may be taken large.

4. 发明专利

JPS577534A MEASUREMENT OF DISTRIBUTION PARAMETER IN REFRACTIVE INDEX OF OPTICAL FIBER 失效
公开(公告)号：JPS577534A
公开(公告)日：1982-01-14
申请号：JP8174380
申请日：1980-06-16
申请人： NIPPON TELEGRAPH & TELEPHONE , SUMITOMO ELECTRIC INDUSTRIES
发明人： TANIFUJI TADATOSHI , IWASAKI KEIICHIROU
IPC分类号： G01M11/02 , G01M11/00
摘要： PURPOSE:To enable the measurement of an optical fiber in comparison with the distribution parameter of refractive index at a certain wavelength by utilizing a difference in the velocity of light propagation near the optical axis from that propagating in the perimeter near the boundary between the core and the clad thereof. CONSTITUTION:A laser beam modulated by a sine waveform or the like propagates near the optical axis through a pin hole or the like while propagating in the perimeter near the boundary between the core and the clad through a ring-shaped space filter or the like passing through a fiber 3 to be measured and beam split 5 and then, is separately received and detected with detectors 91 and 92. A phase difference theta of both detction outputs is measured with a phase difference measuring device 10 based on the equation I on the outputs. The phase difference turns positive or negative depending on whether the propagation speed at different parts of an optical fiber is larger or smaller than the distribution parameter of refractive index at a certain wavelength, which permits the measurement of the fiber on the variation with respect to the distribution parmeter of the refractive index as well as the wavelength involved. In the equation, f represents the frequency of a modulated signal, L the length of an optical fiber, lambdai and lambdao optical axes and taui and tauo delayed propagation times in thellight wavelength in the perimeter.

5. 发明专利

JPS576809A METHOD OF CONSTITUTING OPTICAL COMMUNICATION LINE 失效
公开(公告)号：JPS576809A
公开(公告)日：1982-01-13
申请号：JP8174480
申请日：1980-06-16
申请人： NIPPON TELEGRAPH & TELEPHONE , SUMITOMO ELECTRIC INDUSTRIES
发明人： TATSUTA MITSUHIRO , IWASAKI KEIICHIROU
IPC分类号： H04B10/60 , G02B6/02 , G02B6/26 , H04B10/00 , H04B10/2513 , H04B10/2581 , H04B10/40 , H04B10/50
摘要： PURPOSE:To make the transmission band of a long-sized communication line wider by determining the magnitudes of refractive index distribution parameters from the quantity of phase rotation based on the time difference of light propagation near the optical axis of cores and near the outside circumferential part and alternately connecting those of large and small parameters. CONSTITUTION:The magnitudes and degress of the alpha parameters of individual optical fibers are known and the fibers of which the refractive index distribution parameters are larger than alphaopt and smaller than the same are connected, wherby the differences in group delay time between the mode propagating near the optical axis and the mode propagating mainly in the outside circumferential part near the boundary of core and clad parts are mutually compensated by the inverse characteristics relating to the group delay time of the two connected fibers, and the transmission line of a small time difference and a wide band is obtained. In this way, the transmission band of the long-sized communication line is maed wider by alternately connecting the fibers of which the refractive index parameters are latger and smaller than alphaopt in use wavelengths in this way.

6. 发明专利

JPS5651636A MEASURING METHOD FOR MATERIAL DISPERSION CHARACTERISTIC OF FIBER 失效
公开(公告)号：JPS5651636A
公开(公告)日：1981-05-09
申请号：JP12715779
申请日：1979-10-01
申请人： NIPPON TELEGRAPH & TELEPHONE , SUMITOMO ELECTRIC INDUSTRIES
发明人： TOKUDA MASAMITSU , IWASAKI KEIICHIROU
IPC分类号： G01M11/02 , G01M11/00 , G02B6/00
摘要： PURPOSE:To make it possible to separate and measure only the effect of material dispersion with high precision by halving light amplitude-modulated with a single sine wave, by causing them to strike optical fibers differing in length and by measuring a phase difference between detection signals by varying the wavelength of light. CONSTITUTION:Light from variable wavelength light source 1, when passing through external modulator 2, is amplitude-modulated with a high-frequency signal from electric signal generator 3. This modulated light is branched into two by branching filter 4; one is incident to optical fiber 5, and the other to optical fiber 6 differing in length from optical fiber 5. Lights having propagated in optical fibers 5 and 6 are converted into electric signals by detectors 8 and 9 and phase difference measuring instrument 9 measures the phase difference. Next, the wavelength of light source 1 is slightly varied to measure the phase difference again and the wavelength is sequentially varied to measure a phase shift to the wavelength, so that the effect of material dispersion will be obtained.

7. 发明专利

JPS5417857A OPTICAL AXIS ADJUSTING METHOD OF OPTICAL CABLES 失效
公开(公告)号：JPS5417857A
公开(公告)日：1979-02-09
申请号：JP8335677
申请日：1977-07-11
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： IWASAKI KEIICHIROU
IPC分类号： G02B6/42 , H01B11/00 , H01P3/00
摘要： PURPOSE:To measure the transmission characteristics of the optical fiber cable disposed with both ends being placed apart, by remote controlling the optical axis adjustment of the cable being measured by the use of the control signal received at the remote end.

8. 发明专利

JPS53144601A LIGHT COMMUNICATION CHANNEL 失效
公开(公告)号：JPS53144601A
公开(公告)日：1978-12-16
申请号：JP6023977
申请日：1977-05-23
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： IWASAKI KEIICHIROU
IPC分类号： H04B10/00 , G02B5/20 , G02B6/00 , G02B6/34 , H04B10/2507 , H04B10/2513
摘要： PURPOSE:To accelerate a signal speed while improving the pulse variance distortion due to material variance, by providing a filter ring element between a laminous source or phot detector and a light fiber.

9. 发明专利

JPS5589721A EVALUATION METHOD FOR CONNECTION LOSS OF OPTICAL CABLE 失效
公开(公告)号：JPS5589721A
公开(公告)日：1980-07-07
申请号：JP16422178
申请日：1978-12-27
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： IWASAKI KEIICHIROU
IPC分类号： G01J1/00 , G01M11/00 , G01M11/02 , G02B6/42
摘要： PURPOSE:To obtain the connection loss of optical cable which is measured for transmission loss in advance, by inputting optical pulse to the fiber of which connection end is processed with perfect reflection film and to the fiber one end of connected cable of which is processed with perfect refelction film, and by measuring the reflected light. CONSTITUTION:Optical pulse is incident from the input end 14 to the fiber of which connection end 7 is processed with the perfect reflection film (metal film such as Ag, Ni), and the reflection light 22 reflected on the reflection film of the connection end 7 is measured. Next, the reflection film of the connection end 7 is eliminated, and it is connected to the fiber in which one end 18 of connected cable 5 is processed with perfect reflection film, and the reflected light 23 from the fiber end is measured by incident optical light from the input end 14. The reflected light 22 receives the reduction by transmission loss 2alphaC(dB) in comparison with the light 23 while it reciprocates the optical cable 5, and further, it received the connection loss by 2alphaJ(dB) because of twice transmission of the connection 7. Thus, taking the energy loss of reflection lights as S22, S23, the connection loss alphaJ is obtained as alphaJ=(+10logS22/S23)/2-alphaC.

10. 发明专利

JPS5328447A MEASUREMENT OF LENGTH OF OPTICAL FIBER AND DEVICE THEREFOR 失效
公开(公告)号：JPS5328447A
公开(公告)日：1978-03-16
申请号：JP10236976
申请日：1976-08-27
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： TAKIMOTO HIDEYUKI , IWASAKI KEIICHIROU
IPC分类号： G01M11/00 , G01B9/00 , G01B11/02
摘要： PURPOSE:To measure the length of an optical fiber and simplify the measurement by detecting the difference of phase produced by the transmission of a light wave in which the intensity is modulated by the sine wave through the optical fiber.

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