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91. 发明专利

JPH02259708A OPTICAL FIBER CONNECTOR 失效
公开(公告)号：JPH02259708A
公开(公告)日：1990-10-22
申请号：JP7867389
申请日：1989-03-31
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NODA JUICHI , HAIBARA TADASHI , NAGASE AKIRA
IPC分类号： G02B6/38
摘要： PURPOSE:To obtain an optical fiber connector which can detach and connect optical fibers with small loss and with high density in a small size by combining and using a split sleeve for aligning the axis of a ferrule and a leaf spring with which the tight adhesion of an end face is enhanced. CONSTITUTION:In the case of connecting two optical fibers 21a and 21b, the optical fibers 21a and 21b are respectively inserted in the ferrules 23a and 23b and the end faces ground. Then, the ferrules 23a and 23b are inserted in the split sleeve 25 made of phosphor bronze. The optical fibers 21a and 21b and the ferrules 23a and 23b are made to abut on each other so as to be attached to the leaf spring 26. The central axes of the optical fibers 21a and 21b and the ferrules 23a and 23b are aligned and attached in a state where the end faces are made to tightly adhere to each other, so that the Fresnel reflection on the end face of the optical fiber is suppressed and the connection loss is made small. Since the split sleeve 25 has flanges 24a and 24b, it does not contact the leaf spring 26.

92. 发明专利

JPH02251730A BACK-SCATTER MEASURING APPARATUS FOR LIGHT GUIDE 失效
公开(公告)号：JPH02251730A
公开(公告)日：1990-10-09
申请号：JP7350089
申请日：1989-03-24
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , KOBAYASHI MASARU , NODA JUICHI
IPC分类号： G01M11/02
摘要： PURPOSE:To decrease noises caused by irregularities in moving speed and vibration of a total reflecting mirror and to improve S/N by detecting interference signal generated in a modulating means within the interference intensity of synthesized light in a narrow band. CONSTITUTION:As a splitting and synthesizing means, a fiber-shaped 3-dB coupler 3 is used. As an adjusting means, a cylindrical electrostriction vibrator 16 which is wound around a piece of fiber on the emitting side of the coupler 3 is used. Then, a phase-modulated voltage which is periodically changed in a triangular wave pattern is applied. Thus, linear-phase change alphat (alpha is a constant, and t is time) is imparted to reference light and the reflected light from a light guide 7 to be measured. An optical detector 10 detects the interference signal which is modulated with a modulating means and has the frequency of alpha/2pi in a narrow band based on the signal obtained by receiving and detecting the synthesized light. At this time, the reference light is obtained by moving a total reflecting mirror 5a which is optically coupled with one end of the fiber on the emitting side of the coupler 3 step by step. Therefore, irregular noises due to the irregularities and the like in moving speed of the total reflecting mirror 5a is decreased, and S/N is improved.

93. 发明专利

JPH02236507A WIDE BAND OPTICAL FIBER COUPLER 失效
公开(公告)号：JPH02236507A
公开(公告)日：1990-09-19
申请号：JP5623089
申请日：1989-03-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKEUCHI YOSHIAKI , HANABUSA HIROAKI , NODA JUICHI
IPC分类号： G02B6/293 , G02B6/28
摘要： PURPOSE:To improve the yield in a single mode optical fiber coupler, and also, to realize the conversion to a wide band in a polarization maintaining optical fiber coupler by obtaining the coupler by welding and drawing optical fibers in which the outside diameters of the clads are different from each other. CONSTITUTION:The part corresponding to an optical coupling part 4 of optical fibers 1a, 1b in which the outside diameters of clads are different from each other is welded (weak welding) by an oxyhydrogen burner to each other, and subsequently, by weakening heating power, the vicinity of a welded part is brought to drawing, while waving the burner in the lengthwise direction of the optical fiber, and an optical coupling part 4 is manufactured. In this case, since the outside diameters of the clads are different, the shape of the optical coupling part is specified with high accuracy as a matter of course. In such a way, a wide band coupler of an asymmetrical structure can be obtained uniformly and with high accuracy without executing pre-drawing in a single mode optical fiber.

94. 发明专利

JPH02230399A SECURITY INTERFACE DEVICE 失效
公开(公告)号：JPH02230399A
公开(公告)日：1990-09-12
申请号：JP5074689
申请日：1989-03-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HIRAYAMA MAMORU , NODA JUICHI
IPC分类号： G08B26/00
摘要： PURPOSE:To dissolve a problem of complicted wiring by providing a repeater of serial transmission system between a computer and a sensor, performing the transmission of information between a device which performs sensor control, monitoring, alarm issuing, and display and plural sensors with a serial interface of radio system, and using a relay system. CONSTITUTION:The sensor 1 is connected to an interface device 2, and next, the repeater 3 is connected to the computer 5 with a cable 4. And radio communication of polling access system is performed between the interface device 2 and the repeater 3, and also, communication based on RS232C is performed between the computer 5 and the repeater 3. The repeater 3 stores the number of the interface device designated by the computer 5, and communicates with the interface device 2 sequentially, and transmits data in each sensor 1 to the computer 5. In such a way, it is possible to provide a long distance between the plural sensors and the computer, and to increase the number of sensors compared with that of wiring.

95. 发明专利

JPH02205365A SUPERLUMINESCENT DIODE 失效
公开(公告)号：JPH02205365A
公开(公告)日：1990-08-15
申请号：JP2528989
申请日：1989-02-03
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NOGUCHI ETSUO , NODA JUICHI , NAGAI HARUO
IPC分类号： H01L33/06 , H01L33/14 , H01L33/30 , H01L33/40 , H01L33/00
摘要： PURPOSE:To improve a maximum optical output by employing a quantum well structure as an active layer of a SLD(superluminescence diode). CONSTITUTION:A quantum well structure is employed as an active unit of a SLD. The quantum well structure means that the thickness of a well layer 3 is 300Angstrom or less, and a multiple quantum well structure mean that the thickness of a barrier layer is 200Angstrom or less. In view of the active layer of a laser, the quantum well structure has a feature that an oscillation threshold value density is smaller than that using a normal DH (double hetero) structure, and this feature is caused by a stepwisely formed state density. Thus, a large optical output can be obtained with a small injection current.

96. 发明专利

JPH02140640A BACKSCATTERING LIGHT MEASURING INSTRUMENT 失效
公开(公告)号：JPH02140640A
公开(公告)日：1990-05-30
申请号：JP29413688
申请日：1988-11-21
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , NODA JUICHI , KOBAYASHI MASARU , UCHIDA NAOYA
IPC分类号： G01N21/49 , G01M11/00
摘要： PURPOSE:To attain measurement of the backscattering light generated in the inside with regard to an optical waveguide of arbitrary length by providing a total reflection mirror and an angle control part. CONSTITUTION:An emitted light from a light source 1 is divided into two by a fiber type photocoupler 2, and one of them becomes parallel beams by an objective lens 11, reflected by total reflection mirrors 4, 12 - 14 and follows the same path and made incident on the coupler 2 again. Also, the reflecting direction of the reflecting mirror 4 is set to the direction of the reflecting mirror 12, and set so that the reflecting mirror 12 reflects an incident light in the incident direction. In this case, the optical path length of the reflecting mirror 4 and 12 is set to (l), and when both arms of a Michelson interferometer coincide with each other, the refractive index is denoted as (n), and a backscattering light in a position of l/n in an optical waveguide to be measured 3 can be attained. Also, a position of a prism 7 and an angle of the reflecting mirrors 12 - 15 are set by controlling a moving table 10 and angle control parts 16 - 19 from a signal processing part 15. In such a manner, the backscattering light generated in different points in the optical waveguide 3 can be measured.

97. 发明专利

JPH02110407A OPTICAL FIBER COUPLER 失效
公开(公告)号：JPH02110407A
公开(公告)日：1990-04-23
申请号：JP26112188
申请日：1988-10-17
申请人： FUJIKURA LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： SUZUKI FUMIO , ARIKAWA TORU , KAWAKAMI NOBORU , KIKUCHI YOSHIO , FUKUDA TAKERU , NODA JUICHI
IPC分类号： G02B6/28
摘要： PURPOSE:To reduce the dispersion of mutual optical characteristics for the respective pairs of optical fiber couplers and to miniaturize the optical fiber coupler by burying plural optical fiber in a parallel condition, fixing the fiber, grinding one part of each optical fiber and joining the fiber so that respective grinding surface can be overlapped. CONSTITUTION:Plural optical fiber 14 is buried and fixed in the parallel condition while brought into contact with side surfaces mutually into a groove 13 of a substrate 12 with groove. Then, a pair of substrates 16, for which one part of each optical fiber 14 is ground up to the near part of a core 14 and grinding surfaces 15 are formed, are joined so that the respective grinding surfaces 15 can be overlapped. Thus, the plural types of optical couple operation can be executed by one optical fiber coupler 11 and the dispersion of the optical characteristic can be reduced. Then, the optical fiber coupler to be needed for the plural types of the optical couple operation can be miniaturized.

98. 发明专利

JPH0293407A COATING REMOVER FOR COATED FIBER 失效
公开(公告)号：JPH0293407A
公开(公告)日：1990-04-04
申请号：JP24259788
申请日：1988-09-29
申请人： JAPAN AVIATION ELECTRON , NIPPON TELEGRAPH & TELEPHONE
发明人： YAMAGUCHI TATSUMI , SASAKI HIROYUKI , HANABUSA HIROAKI , NODA JUICHI
IPC分类号： G02B6/00 , G02B6/245 , G02B6/44 , H02G1/12
摘要： PURPOSE:To increase the number of service times of blades by forming the blades in such a manner that the blades can move in a prescribed direction at an acute angle with their axial line and that the blades have cutting edges to be bit into coating parts in a prescribed direction as the blades move. CONSTITUTION:A piece to several pieces of fibers 1 are paralleled and are crimped by an upper body 35 and a lower body 36. The rear ends of the upper and lower blades 9, 10 are pressed like arrows 39a, 39b by a blade driving device (not shown) to bite the front end parts, i.e. the cutting edges into the coating parts 7. Further, the fibers 1 are pulled in an arrow 40 direction by the distance corresponding to an exposing size by relative moving devices (not shown) to partially remove the coating parts 7 and to expose fibers 5. The coating parts 7 are discharged from discharge holes 35, 36 and further, the lower body 32 and the upper body 31 are separated again so as to return the bodies to the initial positions. The fibers 1 are taken out of the spacing therebetween.

99. 发明专利

JPH0267506A OPTICAL FIBER COUPLER 失效
公开(公告)号：JPH0267506A
公开(公告)日：1990-03-07
申请号：JP21858188
申请日：1988-09-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HANABUSA HIROAKI , TAKEUCHI YOSHIAKI , NODA JUICHI
IPC分类号： G02B6/28
摘要： PURPOSE:To obtain a wide wavelength area type optical fiber coupling which is less in wavelength dependency by optically coupling two optical fibers having different cut-off wavelengths, but the same form with each other by side faces. CONSTITUTION:Two optical fibers 1a and 1b having different cut-off wavelengths, but the same form are optically coupled to one body by the side faces. Therefore, since the two optical fibers can be produced by a symmetrical fusion-drawing or polishing method, this optical coupler can be produced easily as compared with the conventional optical fiber coupler produced by the asymmetrical drawing method. By making the cut-off wavelengths of the two optical fibers 1a and 1b produced by fusion-drawing different from each other, an optical fiber coupler having a wavelength depending property which is flatter in imperfect coupling can be obtained.

100. 发明专利

JPH0215229A OPTICAL FIBER PHASE MODULATOR 失效
公开(公告)号：JPH0215229A
公开(公告)日：1990-01-18
申请号：JP16623088
申请日：1988-07-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NODA JUICHI , HANABUSA HIROAKI , TAKEUCHI YOSHIAKI , WATANABE JUNJI , SAITO TADAO , MATSUI SHINSUKE
IPC分类号： G02B26/00 , G02F1/01
摘要： PURPOSE:To reduce the size of the device and to drive it with a low voltage by forming a groove whose width is nearly equal to the external diameter of an optical fiber along the flank of a laminate type piezoelectric vibrator and inserting and fixing the optical fiber in this groove. CONSTITUTION:The laminate type piezoelectric vibrator 11 is constituted by laminating and fixing plate type piezoelectric elements across electrodes. This vibrator 11 and dummy blocks 13 and 14 are adhered and fixed one end surfaces 11a and 13a, and 11b and 14a and the groove 16 which is nearly as wide as the external diameter of the element wire part of the optical fiber 12 and about a half as deep as the external diameter is formed by dicing in one blank including step parts 13b and 14b. Then the respective electrodes of the vibrator 11 and a driving signal source 15 are connected alternately having the opposite polarities and supplied with a driving voltage. Then the vibrator 11 vibrates along the groove 16, the element wire part 12a of the optical fiber 12 in the groove 16 expands or contracts, and the phase of light entering the optical fiber 12 is modulated by variation in optical path length and refractive index.

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