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61. 发明专利

JPH01200309A METHOD FOR SWITCHING AND CONNECTING OPTICAL FIBERS 失效
公开(公告)号：JPH01200309A
公开(公告)日：1989-08-11
申请号：JP2404688
申请日：1988-02-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI HIDEO , MURATA HISASHI , NAGASAWA SHINJI
IPC分类号： G02B6/38 , G02B26/08
摘要： PURPOSE:To surely and rapidly switch and connect optical fibers by mounting arraying plugs which surely grip the spacings of the optical fibers subjected to removal of coverings with high accuracy to said fibers and cutting the optical fibers while detecting the tension. CONSTITUTION:The arraying plugs 10, 20 constituted of arraying members 12, 22 having fiber positioning grooves and retaining members 13, 23 fitting to the members 12, 22 are mounted to both sides of the exposed optical fibers 17. The optical fibers are exactly cut with a slight deviation when the optical fibers are scored and the arraying plugs are pulled and moved axially by detecting the tension of the optical fibers. The ends of the optical fibers can be forcibly aligned by inserting guide pins 39 which are previously inserted into a 3rd arraying plug 30 into the 1st arraying plug 10. The work for switching the optical fiber circuit is thereby executed in a short period of time.

62. 发明专利

JPH01169414A SWITCHING AND CONNECTING DEVICE FOR OPTICAL CONNECTOR PLUG 失效
公开(公告)号：JPH01169414A
公开(公告)日：1989-07-04
申请号：JP32721487
申请日：1987-12-25
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI HIDEO , MURATA HISASHI , SHIMIZU MASATOSHI
IPC分类号： G02B6/38 , G02B26/08
摘要： PURPOSE:To execute the switching at a high speed by executing simultaneously a forward and backward movement and a rotational movement by constituting the title device so that the forward and backward movement and the rotational movement of a connector plug which has been attached can be executed on the same axis. CONSTITUTION:Second and third connector plugs are attached to a fixed coupling member 1, a first connector plug is attached to a movable coupling member 2, and by moving the movable coupling member 2, the first connector plug is connected to the third connector plug. In this case, the title device is formed so that both the members 1, 2 are connected by projecting a center axis 3 from the fixed coupling member 1 and inserting it into an insertion hole which is penetrated through the center of the movable coupling member 2. Accordingly, the movable coupling member 2 can always execute a forward and backward movement and a rotational movement on the center axis 3 of the fixed coupling member 1, and moving exes in two directions of the movable coupling member 2 can be used in common as one axis. In such a way, high speed switching and connection can be realized with high reproducibility.

63. 发明专利

JPH01129621A METHOD FOR SWITCH IN OPTICAL FIBER LINE 失效
公开(公告)号：JPH01129621A
公开(公告)日：1989-05-22
申请号：JP28869287
申请日：1987-11-16
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SHIMIZU MASATOSHI , MURATA HISASHI , WATANABE ICHIRO
IPC分类号： G02B26/08 , H04B1/74 , H04B10/03 , H04B10/032 , H04B10/079
摘要： PURPOSE:To switch an active optical fiber line to a new switching line without interrupting communication state by providing two 1X2 variable branch couplers per one connecting point to two switching points of an active line and varying the branch ratio. CONSTITUTION:A couple of 1X2 variable optical branching couplers 20, 21, 22, 23 are provided at switching points A, B in an active line before switching work. Moreover, a couple of branch side optical fibers 25a, 25b and 31a, 31b are connected respectively to a couple of branch side optical fibers 27a, 27b and 29a, 29b respectively by the couplers 21, 22. Then the branch ratio of each coupler is made variable and the line consists of the coupler 20, a tenttive switching line 13 and the coupler 22 or the like at first and the switching and constitution of the line by the couplers 20, 21, a main switching line and the couplers 22, 23 are implemented by six processes. Thus, the branch ratio is made variable without interrupting the normal state in the site of changeover to prevent rapid change in the optical signal level, then the out of synchronism due to the change in the optical signal level is not caused in comparison with the fixed branch ratio to attain changeover.

64. 发明专利

JPS63304209A METHOD FOR BRANCHING AND JOINING OPTICAL FIBER CIRCUIT AND BRANCHING AND JOINING CONNECTOR 失效
公开(公告)号：JPS63304209A
公开(公告)日：1988-12-12
申请号：JP14004687
申请日：1987-06-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NARA SHINICHI , HATANO SATOSHI , MURATA HISASHI
IPC分类号： G02B6/36 , G02B6/28 , G02B6/32 , G02B6/38
摘要： PURPOSE:To enable efficient and stable taking out of leak light by guiding the leak light component generated at the connection point of optical fibers to the outside of the optical fibers and taking out the same through an optical window provided to a part of a connector plug to a 3rd optical fiber on the outside. CONSTITUTION:Part of the signal light propagating in the optical fiber 10a is made into the leak light by the fiber spacing formed by a film 9. This leak light is trapped in a photoconductive sleeve 5b having the refractive index equal to or larger than the refractive index of a fiber clad and is propagated at a low loss in the sleeve to a terminal part. The terminal face of the photoconductive sleeve forms a reflecting surface 6 set at 45 deg. with the optical axis and a transparent window 7 is provided on the side face of an adapter 41b facing said reflecting surface and, therefore, the leak light component can be taken out to the outside of the plug. The reflecting surface 6 is constituted as a concave reflecting mirror and the light is condensed to an optical fiber 30 for branching by using a rod lens 31 for condensing, by which the signal light is efficiently branched.

65. 发明专利

JPS63242035A COMMUNICATION STATE IDENTIFICATION METHOD FOR OPTICAL FIBER COMMUNICATION LINE 失效
公开(公告)号：JPS63242035A
公开(公告)日：1988-10-07
申请号：JP7548787
申请日：1987-03-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： WATANABE ICHIRO , MURATA HISASHI , TATSUTA MITSUHIRO
IPC分类号： H04B10/07 , H04B10/079 , H04L13/00 , H04L25/02 , H04L29/14
摘要： PURPOSE:To acquire communication state information at an optional location of an optical fiber line by converting part of an optical signal into an electric signal, counting the signal at a prescribed time interval, comparing the count with a number at a prescribed time interval at non-communication and discriminating it as the noncommunication state in case of coincidence and it as the communication state in case of dissidence. CONSTITUTION:A photodetector 12 is coupled optically to an optical fiber core-wire 11 in an optical fiber line, part of an optical signal is extracted and converted into an electric signal by the photodetector 12, either of the leading/trailing of a transmission signal at least is counted by a prescribed time interval and compared with a number at a prescribed time interval at known noncommunication state, and in case of coincidence, it is discriminated to be in the noncommunication state and to be in the communication state in case of dissidence. That is, the number of leading edges or of trailing edges or both counted at a prescribed time differ depending on noncommunication and communication state. Thus, the output of a counter 16 is discriminated by an arithmetic circuit 18 to discriminate whether it is a value at noncommunication or a value at communication thereby identifying whether the line is in the communication state or the noncommunication state.

66. 发明专利

JPS63201547A MEASURING INSTRUMENT FOR REFRACTIVE INDEX DISTRIBUTION 失效
公开(公告)号：JPS63201547A
公开(公告)日：1988-08-19
申请号：JP3432387
申请日：1987-02-17
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AZUMA YUJI , MURATA HISASHI
IPC分类号： G01M11/02 , G01N21/41
摘要： PURPOSE:To easily obtain a stable measured value by using a single-mode optical fiber and a multimode optical fiber for a refractive index distribution measurement system which measures variation in the quantity of reflected light due to the difference in refractive index from a surface to be measured. CONSTITUTION:An irradiation optical system has the single-mode optical fiber 42 coupled with one terminal of a light source 40, and the other terminal part is held by a holder 44 to emit light toward the object surface of a body 46 to be measured. A photodetection optical system has the multimode optical fiber 48 held by the holder 44 so as to receive reflected light from the irradiated surface for the projection light from the single-mode optical fiber 42 by one terminal and the other terminal is coupled with a power measuring instrument 50. Further, a fine moving means 52 is provided which displaces the light projection terminal part of the irradiation optical system, the photodetection terminal part of the photodetection optical system, and the surface to be measured relatively along the surface to be measured. Light power received by the multimode optical fiber 48 is measured by the light power measuring instrument 50 to know the difference in the reflective index from the measured surface, thereby calculating the refractive index of the surface.

67. 发明专利

JPS63172531A COMMUNICATION STATE DISCRIMINATING METHOD FOR OPTICAL FIBER COMMUNICATION LINE. 失效
公开(公告)号：JPS63172531A
公开(公告)日：1988-07-16
申请号：JP333587
申请日：1987-01-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： WATANABE ICHIRO , YAMASHITA KATSUYA , TATSUTA MITSUHIRO , MURATA HISASHI
IPC分类号： H04B10/07 , H04B10/079
摘要： PURPOSE:To discriminate a communication state at an optional part of an optical fiber communication line by extracting a part of an optical signal from an optical fiber cable and converting it into an electric signal and comparing the electric signal filtered by a band pass filter with a reference level. CONSTITUTION:A part of the optical signal propagated in the optical fiber 11 is led to a photodetector 12, converted into an electric signal and amplifier and filtered by band pass filters 14a, 14b having a different band pass characteristic. Then the result is averaged timewise by averaging device 15a, 15b and the level difference is detected by a comparator 16. Whether or not the output of the comparator is in the communication state or the non communication state is identified by comparing the output of the comparator with a reference level set to the intermediate level between the output of the averaging devices 51a, 51b at non communication and the output of the averaging devices 15a, 15b at communication by means of a threshold level discriminator 17. Thus, the information relating to the communication state is acquired at the optional position of the optical fiber line.

68. 发明专利

JPS62276507A METHOD FOR SWITCHING OPTICAL-FIBER TRANSMISSION LINE 失效
公开(公告)号：JPS62276507A
公开(公告)日：1987-12-01
申请号：JP11904886
申请日：1986-05-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURATA HISASHI , WATANABE ICHIRO , TATSUTA MITSUHIRO
IPC分类号： H04B10/25 , G02B6/00 , G02B6/28 , H04B10/00 , H04B10/032 , H04B10/079
摘要： PURPOSE:To switch an optical-fiber transmission line to a new line for switching without interrupting a communicating state, by directly producing by working light branching and coupling devices to the currently used line and controlling the optical signal level by making the branching ratio variable. CONSTITUTION:Light branching and coupling devices 21a and 21b are directly produced by working at a job site by stress-cutting the optical fiber of a currently used line 10 without producing any axial shifting and inserting probes 22a and 22b for branching into spaces between end faces while the intervals between the end faces are finely adjusted and, at the same time, the optical signal level is controlled by making the branching ratio variable. Therefore, the level change of optical signals is controlled during the working process of the currently used line 10 and switching process to this switching line 14 and the AGC function of the transmitter side can sufficiently be utilized. Regarding the delayed time difference of the optical signals caused by the line lengths before and after switching, synchronism can be maintained to an optional transmitting speed, by temporarily converting the optical signals into electric signals by using a temporary switching line 13 and utilizing the variable delayer 32 of an electric system.

69. 发明专利

JPS60221712A COUPLING METHOD OF OPTICAL FIBER AND OPTICAL SIGNAL ELEMENT 失效
公开(公告)号：JPS60221712A
公开(公告)日：1985-11-06
申请号：JP7784884
申请日：1984-04-18
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SUMITA MAKOTO , MURATA HISASHI , KATSUYAMA YUTAKA
IPC分类号： G02B6/42 , G01M11/08
摘要： PURPOSE:To obtain the coupling method with small coupling loss by covering a bent part of an optical fiber with a scattering body or light reflector together with an optical signal element. CONSTITUTION:The optical fiber 1 is bent at a part 2 and this part is covered with a container 3. The light signal element (light source) 4 is fitted in the container 3. The internal surface of this container 3 is covered with the scattering body. In another way, the bent part is covered with reflectors 8 and 9 together with the optical signal element 4. Consequently, an optical signal is reflected in the container 3 or between the reflectors 8 and 9 several times without leaking out and illuminates the bent part 2 uniformly, and the optical signal is coupled with the optical fiber 1 to the same quantity of light in two directions, thereby reducing the coupling loss.

70. 发明专利

JPS6035646B2 失效
公开(公告)号：JPS6035646B2
公开(公告)日：1985-08-15
申请号：JP9906981
申请日：1981-06-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURATA HISASHI , NAGASAWA SHINJI , SATAKE TOSHIAKI , MIKAWA IZUMI
IPC分类号： G02B6/24 , G02B6/36 , G02B6/38

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