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11. 发明专利

JPH02256009A OPTICAL CONNECTOR 失效
公开(公告)号：JPH02256009A
公开(公告)日：1990-10-16
申请号：JP7907589
申请日：1989-03-29
申请人： SUMITOMO ELECTRIC INDUSTRIES , NIPPON TELEGRAPH & TELEPHONE
发明人： KOMIYA TAKEO , KAKII TOSHIAKI , SUZUKI SHUZO , MURATA HISASHI , NAGASAWA SHINJI
IPC分类号： G02B6/36 , G02B6/40
摘要： PURPOSE:To obtain the optical connector having high accuracy and excellent handling characteristic by combining a V-grooved base plate worked with high accuracy and resin molding. CONSTITUTION:The front surface of an optical fiber guide member 1, exclusive of a flat plate 12 and a window part 4 for facilitating the insertion of optical fibers, is molded of a resin molding part 3. Guide pin holes 2 are formed in guide pin V-grooves 24 by this resin molding part 3 and tapered holes 5 which communicate with optical fiber holes 13' and expand in the diameter toward the rear end are formed right after the rear end part of the flat plate 12. Further, V-shaped grooves 6 for guiding the coated optical fibers communicating with the tapered holes 5 are formed in the window part 4 in the rear part thereof. The insertion characteristic of the optical fibers is greatly improved in this way and the production is facilitated.

12. 发明专利

JPS63298312A OPTICAL FIBER CABLE AND OPTICAL FIBER CABLE LINE 失效
公开(公告)号：JPS63298312A
公开(公告)日：1988-12-06
申请号：JP13411087
申请日：1987-05-29
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HATANO SATOSHI , NARA SHINICHI , MURATA HISASHI
IPC分类号： G02B6/38 , G02B6/28 , G02B6/44
摘要： PURPOSE:To eliminate a need of optical couplers and branching devices and to reduce the insertion loss accompanied with them by attaching a connector plug for optical coupling which is provided with a light guide sleeve essentially consisting of a transparent material and a transparent window provided to face the terminal face of the light guide sleeve. CONSTITUTION:A connector plug 25 for connection to which a centering member of an optical fiber is set is attached to one end of an optical fiber cable 18 constituted by providing a coating around the optical fiber, and a connector plug 26 for optical branching/coupling provided with a centering member of the optical fiber, a light guide sleeve 22 which is arranged to surround the optical fiber and essentially consists of the transparent material, and a transpar ent window 21 provided to face a reflection face 23 of this sleeve is attached to the other end. Since the optical coupling function and the optical branching function are given to the optical fiber connector plug, independent parts such as optical couplers and optical branching devices are unnecessary and the num ber of connection points is reduced to reduce the connection loss.

13. 发明专利

JPS63177627A DISCRIMINATING METHOD FOR COMMUNICATION STATE OF OPTICAL FIBER COMMUNICATION LINE 失效
公开(公告)号：JPS63177627A
公开(公告)日：1988-07-21
申请号：JP806587
申请日：1987-01-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： WATANABE ICHIRO , MURATA HISASHI , TATSUTA MITSUHIRO
IPC分类号： H04B10/07 , H04B10/079
摘要： PURPOSE:To discriminate a communication state of the circuit with high reliability by using a timing signal extracted from a waveform shaping device, as a start trigger for an averaging processing, averaging an output of the waveform shaping device by the time of 1/2 time of a repeated period of the time of non-communication from a start of a time slot, and deciding an averaged level. CONSTITUTION:From an optical fiber in an optical fiber line for constituting an optical fiber communication line, a part of an optical signal is fetched and converted to an electric signal by a photodetector, an output of the photodetector is brought to waveform shaping by a waveform shaping device, and an output of the waveform shaping device is averaged during the minimum repeated period of the time of non- communication state by an averaging device. Subsequently, an output of the averaging device is delayed by a delaying device, an output of the delaying device and an output of the averaging device are compared mutually by a comparator, its output is brought to a level decision by a threshold value deciding device, a detection of a state display bit for discriminating whether the line concerned is in a communication state or in a non-communication state is not executed, and an average power during the repeated period at the time of non-communication state is used as an information origin, therefore, the reliability of discrimination is improved.

14. 发明专利

JPS63155119A OPTICAL FIBER LINE SWITCHING METHOD AND OPTICAL FIBER SWITCH 失效
公开(公告)号：JPS63155119A
公开(公告)日：1988-06-28
申请号：JP30181886
申请日：1986-12-19
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURATA HISASHI , WATANABE ICHIRO , TANABE TOKUO
IPC分类号： G02B26/08 , H04B10/00 , H04B10/032 , H04B10/077 , H04B10/2581
摘要： PURPOSE:To perform a prescribed line switching even in a network distributed over a wide area without any trouble by propagating the light of switching control signal to a switching destination line side and generating a switching trigger signal, and putting one of both optical fiber switches in operation with the switching trigger signal. CONSTITUTION:The switching destination line 7 is provided successively to a shared line 6 between two isolated points of an optical fiber line 1 and the optical switches 2 and 3 installed at the two points are operated to switch and connect the switching destination line 7 to the optical fiber line 1. At this time, switching control signal light beams e2 and e3 are excited and propagated to the side of the switching destination line 7 and the switching trigger signal for driving the optical fiber switches 2 and 3 are generated from the switching control signals to operate at least one of the optical fiber switches 2 and 3 installed at the two points with the switching trigger signal. Consequently, the prescribed line switching is performed even in a network which is generally distributed over a wide area without any trouble.

15. 发明专利

JPS6253061B2 失效
公开(公告)号：JPS6253061B2
公开(公告)日：1987-11-09
申请号：JP7531684
申请日：1984-04-14
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SUMITA MAKOTO , MURATA HISASHI , KATSUYAMA YUTAKA
IPC分类号： G01M11/02 , G01M11/00 , G02B6/00

16. 发明专利

JPS61231515A OPTICAL FIBER CABLE 失效
公开(公告)号：JPS61231515A
公开(公告)日：1986-10-15
申请号：JP7106885
申请日：1985-04-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MURATA HISASHI
IPC分类号： G02B6/00 , G02B6/44
摘要： PURPOSE:To specify the length of a cable with high accuracy by extending an optical fiber for measurement longitudinally along a high tensile strength body arranged in the center of a cable. CONSTITUTION:The optical fiber 8 for measurement which is stored in a tube 2 made of a material with a high elastic modulus is installed at the center part of the cable where it is not twisted at all even the high strength body 1 positioned in the center part of the cable and correct cable length is obtained even when the cable is bent. Therefore, the optical fiber 8 for measurement is used to take a measurement by a conventional light pulse method, and then the cable length is measured accurately even when the cable is wound around a drum.

17. 发明专利

JPS60216313A CONSTITUTING METHOD OF OPTICAL LINE 失效
公开(公告)号：JPS60216313A
公开(公告)日：1985-10-29
申请号：JP7169884
申请日：1984-04-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SUMITA MAKOTO , MAEKAWA EIJI , MURATA HISASHI
IPC分类号： G02B6/00 , G02B6/02 , G02B6/04
摘要： PURPOSE:To the quantity of crosstalk of an optical transmission network which uses cables composed of multicore optical fibers by providing a lateral pressure part or bent part to optical fibers of an optical line network. CONSTITUTION:It is evident in a graph that when a lateral pressure load is increased, an increase in the loss of crosstalk light is larger than that of signal light. For example, when the lateral pressure load is 5kg/40cm, the increase in the loss of the light signal is about 0.3dB, but the increase in the loss of the crosstalk light is about 8dB. Consequently, the application of the lateral pressure increases the increase in the loss of the crosstalk light sufficiently as compared with the increase in the loss of the light signal, so the crosstalk is reduced without lowering the light power level of the light signal. The figure shows an example of line constitution where a lateral pressure part 8 is provided to each connection point 7 in a subscriber optical line network composed of a multicore optical fiber 6.

18. 发明专利

JPS60177309A OPTICAL CABLE 失效
公开(公告)号：JPS60177309A
公开(公告)日：1985-09-11
申请号：JP3392884
申请日：1984-02-24
申请人： SUMITOMO ELECTRIC INDUSTRIES , NIPPON TELEGRAPH & TELEPHONE
发明人： SAEN HARUO , KINUTA HIDETOSHI , MURATA HISASHI
IPC分类号： H01B7/17 , G02B6/44
摘要： PURPOSE:To improve flexibility with thin, simple structure by storing one optical fiber in each of plural cavities provided independently in an S-Z twist state at specific pitch in the axial direction of a columnar insulator without contacting. CONSTITUTION:One optical fiber 2 is stored in each of plural cavity 6 provided independently in the S-Z twist state at specific pitch in the axial direction of the columnar insulator 4 without contacting. The columnar insulator 4 is made of synthetic resin, and protects the optical fibers 2 against external force and also serves as an insulator when a bare conductor 3 is stored in a cavity. The number of the cavities 6 is >=2 and determined optionally. Further, a tension member 1 may be embedded in the columnar insulator 4. Thus, the flexibility is improved with the thin and simple structure.

19. 发明专利

JPS60153013A HIGH-STRENGTH OPTICAL FIBER SINGLE-CORE CABLE 失效
公开(公告)号：JPS60153013A
公开(公告)日：1985-08-12
申请号：JP842784
申请日：1984-01-23
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMAMOTO FUMIO , MURATA HISASHI , YAMAKAWA SHINZOU
IPC分类号： G02B6/44
摘要： PURPOSE:To suppress the combustibility and deformation of a plastic tube by winding a plastic tube which has a high elasticity modulus and a low coefficient of linear expansion as the secondary coating layer of a single core cable with a flame-resistant tape by pressing. CONSTITUTION:This cable is provided with an optical fiber 1, primary coating layer with a low elastic modulus, air layer 3, secondary coating layer 4 which is increased in high elastic modules and decreased in coefficient of linear expansion by being heated dielectrically and drawn, flame-resistant tape 5, and plastic sheath 6. The secondary coating layer 4 protects the optical fiber 1 and serves as a tensile strength material and a compressive material against mechanical strength which operates on the cable lengthwise. Further, there is the air layer 3 formed between the primary coating layer 2 and secondary coating layer 4, so the secondary coating layer 4 becomes flat to lateral pressure and collapses eventually. An increase in tube diameter at right angles to the lateral pressure is suppressed to increase greatly the lateral pressure at which the collapse occurs.

20. 发明专利

JPS59232942A PRODUCTION OF FIBER REINFORCED PLASTIC COATED OPTICAL FIBER CORE 失效
公开(公告)号：JPS59232942A
公开(公告)日：1984-12-27
申请号：JP10763783
申请日：1983-06-17
申请人： SUMITOMO ELECTRIC INDUSTRIES , NIPPON TELEGRAPH & TELEPHONE
发明人： SUZUKI YOUICHI , MURATA HISASHI
IPC分类号： C03C25/10 , B29C70/06 , B29L31/06 , G02B6/44 , C03C25/02 , G02B5/14
摘要： PURPOSE:To stabilize a coating operation and to improve working efficiency in the stage of coating a fiber reinforced plastic by a drawing and forming method on an optical fiber strand by cooling the inlet part of the die of a heating and curing furnace to prevent the curing of the resin sticking thereon. CONSTITUTION:An optical fiber strand 12 provided with a protective layer of a plastic and reinforcing fibers 11 impregnated with a thermosetting resin are conducted into the die 14 in a heating and curing furnace where the fiber strand and reinforcing fibers are heated by a heater 13 to cure the resin in the reinforcing fibers to manufacture an optical fiber core coated with the fiber reinforced plastic layer. The inlet part of the die 14 is projected to the outside of the heater 13 to form a cooling part 17. Cooling water is introduced into said part through a cooling water inlet 15 and is discharged through a cooling water outlet 16 to cool the part 17. The curing of the resin sticking in the inlet part of the die 14 is thus prevented and the shutdown of the line, etc. arising from the sticking and curing of the resin are prevented.

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