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91. 发明专利

JPH0961760A POLLING METHOD FOR OPTICAL WAVEGUIDE 失效
公开(公告)号：JPH0961760A
公开(公告)日：1997-03-07
申请号：JP22070195
申请日：1995-08-29
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KITAGAWA TAKESHI , OGUMA MANABU , HATTORI KUNINORI , ABE ATSUSHI , HIMENO AKIRA , TAKAHASHI HIROSHI
IPC分类号： G02B6/12 , G02F1/01
摘要： PROBLEM TO BE SOLVED: To provide a polling method for an optical waveguide with which a large electro-optical constant is obtainable and the damage of metallic thin- film electrodes is averted by irradiating these electrodes with radiations at the time of impression of high voltage. SOLUTION: The entire part of the optical switch 10 is irradiated with γrays 31 generated by the decay of cobalt atom nuclei from a radiation generator 30 while a DC high voltage of 3000V is impressed on the optical switch 10 from a high-voltage power source 20. Electrons and holes are extremely efficiently generated in a glass network and large electric polarization is induced in the quartz optical waveguide when the optical waveguide is irradiate with the radiation while the high voltage is impressed between the electrodes arranged near the optical waveguide. Consequently, the optical waveguide having the large electrooptical constant is produced. The radiations, such as γ rays and X-rays, transmit the metallic thin-film electrodes of a thickness of about 1μ and, therefore, the shielding of the radiations by the electrodes and the damage of the electrodes do not arise.

92. 发明专利

JPH06232843A OPTICAL WAVE ADDRESS SYSTEM 失效
公开(公告)号：JPH06232843A
公开(公告)日：1994-08-19
申请号：JP1573593
申请日：1993-02-02
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TACHIKAWA YOSHIAKI , TAKAHASHI HIROSHI , KAWACHI MASAO
IPC分类号： H04J14/00 , G02B6/34 , H04B10/07 , H04B10/27 , H04B10/29 , H04B10/54 , H04B10/572 , H04J14/02 , H04B10/02
摘要： PURPOSE:To simplify an NXN optical synthesizer/branching filter conventionally constituted by combining a lot of optical synthesizers/branching filters with the constitution using an NXN waveguide type optical synthesizer/branching filter and a variable wavelength light source, to improve the yield, and to select or switch an address for sending optical signals by setting the wavelength of the variable wavelength light source. CONSTITUTION:This optical wave address system is composed of plural variable wavelength semiconductor light sources 1, optical signal processor 2 for performing signal processing to emit light from the variable wavelength light sources 1, array waveguide defraction grating type optical synthesizer/branching filter constituted by forming plural input waveguides 5, spline waveguides 7 and 8, array waveguide defraction grating 9 and plural output waveguides 6 on an optical waveguide substrate so as to respectively output the input signal beams of plural wavelengths emitted from the plural variable wavelength light sources 1 from these plural output waveguides 6 corresponding to the respective wavelengths, and plural photodetectors 12 for detecting optical signals outputted from the array waveguide defraction grating type optical synthesizer/branching filter 10.

93. 发明专利

JPH04241304A POLARIZATION INDEPENDENT WAVEGUIDE TYPE OPTICAL DEVICE 失效
公开(公告)号：JPH04241304A
公开(公告)日：1992-08-28
申请号：JP290391
申请日：1991-01-14
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKAHASHI HIROSHI , NISHI NORIO , OKUNO MASAYUKI
IPC分类号： G02B6/12
摘要： PURPOSE:To provide the polarization independent waveguide type optical device which eliminates the polarization dependency on incident signal light. CONSTITUTION:One piece or >=2 pieces of polarization rotating devices 11 for converting a horizontally polarized wave (TE) to a vertically polarized wave (TM) or the vertically polarized wave to the horizontally polarized wave are installed in the mid-way of the waveguide in such a manner that the optical path length to the input of the horizontally polarized wave and the optical path length of the input light of the vertically polarized wave are equal to each other.

94. 发明专利

JPH0430108A WAVEGUIDE TYPE OPTICAL STAR COUPLER 失效
公开(公告)号：JPH0430108A
公开(公告)日：1992-02-03
申请号：JP13548390
申请日：1990-05-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKAHASHI HIROSHI , OKAMOTO KATSUNARI
IPC分类号： G02B6/122 , G02B6/12
摘要： PURPOSE:To obtain the waveguide type optical star coupler of a large distribution number and of a small insertion loss by providing a tapered waveguide between each channel waveguide for output and a sector slab waveguide. CONSTITUTION:In the case the channel waveguide and a slab waveguide are connected, signal light having been ropagated in the channel waveguide expands in a horizontal direction by diffraction because there is no confinement in the slab waveguide. At that time, a wave front is positioned on a circular arc centered at the vicinity of the connection part of the channel waveguide and the slab waveguide. Accordingly, by arranging one end of the channel waveguide for input at the center of curvature of the sector slab waveguide or its vicinity, the wave front of the signal light coincides with the circumference of the sector slab waveguide. If the channel waveguide for output of the desired distribution number is arranged on the circumference of of the sector slab waveguide, the signal light having been propagated in the sector slab waveguide branches as being guided by each channel waveguide for output, and the waveguide type star coupler is obtained. Thus, a loss can be lowered.

95. 发明专利

JPS63314123A END SURFACE PLATE FOR CABLE CONNECTION SECTION CASE 失效
公开(公告)号：JPS63314123A
公开(公告)日：1988-12-22
申请号：JP14645187
申请日：1987-06-12
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： MIYAZAWA HIDEHISA , OTA SHINICHIRO , HINOHARA TSUNEHITO , KOSUGI KENJI , TAKAHASHI HIROSHI
IPC分类号： H02G15/10
摘要： PURPOSE:To obtain end surface plates according to the change of the dimension of cables, by arranging concentric grooves in adjacent contact with cable penetration slots, and by fitting the ring-formed projections of a filling spacer on the grooves. CONSTITUTION:At both the ends of sleeves 18, cables 16 with filling spacers 9 inside are arranged, and reinforcement plates 21 are butted to the external sides of the cables 16, to form combined units, and are fitted on and engaged with peripheral grooves 22 at both the ends of the sleeves 18. In case that end surface plates 1 are fitted on the outer peripheries of the cables 16, when cable penetration slots 3, 10 are not accommodated to the dimensions of the cables 16 and are less, then the filling spacers 9 are removed from end surface plate main-units 2, and at the positions of concentric grooves 6 accommodated to the dimensions of the cables 16, according to the forms, the end surface plate main-units 2 are cut off, and also at the filling spacers 9, ring-formed recessed sections 14 are cut off, and the cable penetration slots 3, 10 are enlarged. On concentric grooves 8 which are not cut off, the ring-formed projections of the filling Spacers 9 are fitted, and so the concentric grooves 8 can be prevented from being of mechanical weak points.

96. 发明专利

JPS63207039A ELECTRON GUN 失效
公开(公告)号：JPS63207039A
公开(公告)日：1988-08-26
申请号：JP3810887
申请日：1987-02-23
申请人： NIPPON TELEGRAPH & TELEPHONE , EIKO ENG KK
发明人： SUGIURA HIDEO , TAKAHASHI HIROSHI
IPC分类号： H01J37/06 , H01J37/18
摘要： PURPOSE:To prolong the life of filaments by attaching an exhaust system, a differentially exhausting means and others to a vacuum vessel as well as arranging multiple filaments using an electron lens in common. CONSTITUTION:A vacuum pump 14 exhausts the chamber 13 of a molecular beam epitaxy equipment (MBE) and a vacuum vessel 1 provided with a bus flange 3 of the exhaust system together. When the degree of vacuum in this vessel 1 reaches a predetermined value, either of two filaments 4a and 4b is heated, the emitted electrons from which are converged by a focusing lens composed of an anode 8, a focusing coil 9, a deflecting electrode and others and besides used in common by the filaments 4a, 4b, and are injected onto a substrate 19 in the MBE 13 through the fine injecting aperture 12a of a differentially exhausting means 12. And the electron beam diffracted by a deposited film on the substrate 19 is displayed on a fluorescent screen 20. This configuration prevents evaporated matters from entering into the vessel 1 with the means 12 and at the same time prevents the evaporated matters from attaching to the multiple filaments and thereby is able to prolong the filament life, because of no reduction of the degree of vacuum in the vessel 1 by the help of the exhaust system.

97. 发明专利

JPS60226428A LIGHT TRANSMISSION PATH 失效
公开(公告)号：JPS60226428A
公开(公告)日：1985-11-11
申请号：JP8158784
申请日：1984-04-23
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OOSAWA KAZUYA , TAKAHASHI HIROSHI , KIMURA MASAKI , NAKAHARA MOTOHIRO
IPC分类号： C03C3/06 , C03C3/078 , C03C3/097 , C03C13/04 , G02B6/00 , G02B6/02
摘要： PURPOSE:A light transmission path having stable transmission characteristics and high relieability for the long run, obtained by constituting a high refractive index part for light transmission from glass having a composition consisting of zinc oxide, germanium oxide, phosphorus oxide, and silicon oxide in a specific weight ratio. CONSTITUTION:A transparent glass parent material having a composition consisting of 0.001-5wt% zinc oxide, 0-15wt% germanium oxide, 0-5wt% phosphorus oxide, and 80-99.999wt% silicon oxide is prepared by vapor-phase axial deposition method, etc., to give the high refractive index part 2. The low refractive index part 3 consisting of pure quartz glass or fluorine doped quartz, etc. is formed on the outer periphery of the high refractive index part 2, and both the parts are spun, to give the desired light transmission path 1. Since the prepared light transmission path 1 contains zinc oxide in the high refractive index part 2, it slightly produces oxygen defect, and increase in transmission loss is suppressed.

98. 发明专利

JPS6065736A METHOD FOR ADDING SOLID RAW MATERIAL IN PRODUCTION OF OPTICAL GLASS 失效
公开(公告)号：JPS6065736A
公开(公告)日：1985-04-15
申请号：JP17100083
申请日：1983-09-16
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： SEDAKA RIYOUJI , TAKAHASHI HIROSHI , INAGAKI NOBUO
IPC分类号： C03B8/04 , C03B37/018 , C03C13/04 , G02B6/00
摘要： PURPOSE:To make it possible to add a solid raw material to optical glass, by fluidizing the solid raw material under heating at a high temperature in a raw material supply system, and carrying the fluid raw material on a carrier gas from the raw material supply system to a vapor phase reaction system. CONSTITUTION:A channel switch 16 is closed in a channel (6a) of a raw material supply system 1, and a raw material (A) in a raw material container 10 of a raw material gas generation part 5 is heated at a high temperature in a heating furnace 11, melted and vaporized. The channel switch 16 is then opened to feed a carrier gas, e.g. Ar, under flow rate control with a mass flow controller (4a) through the channel (6a) into the raw material container 10. The vaporized solid raw material (A) is then carried by the carrier gas, passed through a mixing part 8 and fed into the vapor phase reaction system 2.

99. 发明专利

JPS5993403A OPTICAL FIBER 失效
公开(公告)号：JPS5993403A
公开(公告)日：1984-05-29
申请号：JP20338782
申请日：1982-11-19
申请人： FURUKAWA ELECTRIC CO LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TAKAHASHI HIROSHI , SUGIMOTO IWANE , TAJIMA YOSHIMITSU
IPC分类号： C03C25/42 , C03C13/04 , G02B6/44
摘要： PURPOSE:To manufacture easily an optical fiber with high strength by forming the outermost layer consisting of silicon oxide and titanium oxide around a clad. CONSTITUTION:The outermost layer 3 consisting of SiO2 and TiO2 is formed around a glass part composed of a core 1 and a clad 2. The material of the layer 3 is obtd. by adding titanium to quartz glass. Glass consisting of SiO2 and TiO2 has a considerably low coefft. of thermal expansion, and the coefft. is lower than that of quartz. In case of a certain ratio between SiO2 and TiO2, a minus coefft. of thermal expansion is shown. Soot for a thin film consisting of SiO2 and TiO2 is deposited using SiCl4 and TiCl4 as the raw material on the surface of a quartz base material for an optical fiber by an external CVD method, and the base material is drawn to obtain the desired optical fiber with high strength.

100. 发明专利

JPS57106531A MANUFACTURE OF BASE MATERIAL FOR OPTICAL FIBER 失效
公开(公告)号：JPS57106531A
公开(公告)日：1982-07-02
申请号：JP18356480
申请日：1980-12-24
申请人： NIPPON TELEGRAPH & TELEPHONE , FURUKAWA ELECTRIC CO LTD
发明人： NAKAHARA MOTOHIRO , TAKAHASHI HIROSHI
IPC分类号： C03B37/014 , C03B37/012 , G02B6/00
摘要： PURPOSE:To prevent a base material from containing water and to inhibit a low m.p. substance from volatilizing by melting the growing end of a base material for an optical fiber by heating with no flame, depositing powdered starting material on the growing end, and melting it to grow the base material. CONSTITUTION:A heating zone 10 is formed in a tightly sealed container 1 with a heater 8 using no flame, and a base material supporting table 4 is set at the zone 10 and rotated with a rotary shaft 5. Powdered starting material 9 in a starting material feeder 6 is dropped onto the table 4 through a feed pipe 7. The dropped material 9 deposits on the table 4 and is converted into transparent glass by heating to form a base material 11 for an optical fiber, and the top of the material 11 becomes a growing end 12. Powdered material 9 deposits continuously on the end 12, it is simultaneously converted into transparent glass, and the material 11 is grown in the form of the rod. The table 6 lowers in accordance with the growing speed. As the heater 8 an electric heating furnace, laser beams or the like is used, and it is preferable to form an inert gaseous atmosphere.

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