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41. 发明专利

JPH0692647A PRODUCTION OF CR ION-CONTAINING GLASS 失效
公开(公告)号：JPH0692647A
公开(公告)日：1994-04-05
申请号：JP24652192
申请日：1992-09-16
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUJIURA KAZUO , OISHI YASUTAKE , SHIMIZU MAKOTO
IPC分类号： C03C13/04 , C03B8/04 , C03B19/14 , C03B37/018
摘要： PURPOSE:To control valency and coordination number necessary to spread the range of oscillation wavelength and wavelength capable of amplifying by mixing a gaseous mixture of a silicon compound and an organometallic compound with a specific gas and react the gas mixture with an oxygen-containing gas on a substrate. CONSTITUTION:One compound or a mixture of two or more kinds of compounds selected from a halide of Si, a compound obtained by substituting part or all of Si halide with hydrogen, an alkoxide and an organometallic compound and a beta-diketone complex of Cr or chromyl chloride is packed in a stainless bubbler 2. Then, an inert gas 1 is introduced into this bubbler 2 and the produced two kinds of gasses are mixed with an oxygen-containing gas in a mixing chamber 4 and the mixed gas is introduced into a quartz tube 7. Plasma 6 is simultaneously generated in the tube 7 from a microwave generator (A) through a coaxial cable 8 and made to react in a vapor phase or on a substrate to produce glass fine particles or glass film.

42. 发明专利

JPH0677570A OPTICAL FIBER AMPLIFIER 失效
公开(公告)号：JPH0677570A
公开(公告)日：1994-03-18
申请号：JP22367592
申请日：1992-08-24
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SHIMIZU MAKOTO , YAMADA MAKOTO , SUDO SHOICHI , OISHI YASUTAKE
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/094 , H01S3/10 , H01S3/17
摘要： PURPOSE:To obtain a new optical fiber amplifier, in which an optical fiber coupler for multiplexing excitation light and signal light with each other is not used. CONSTITUTION:In an optical fiber amplifier of a structure, wherein ions having an induced emission transition are contained in at least a core part and population inversion is formed by light excitation to provide a fiber for optical amplification use having an optical amplification action in a specified wavelength, an optical circulator 1 having four ports 1-1, 1-2, 1-3 and 1-4 is used and two fibers for signal input use and signal output use are respectively connected to the ports at two places, which are not optically coupled with each other, of the oscillator 1. A fiber for amplification use is connected to one side of the left ports of the circulator 1, the other end of the fiber for amplification use is connected to the end part of a laser module pigtail fiber coupled optically with a laser, signal light is reflected on the connection part 66 the fiber for amplification use with the laser module pigtail fiber and a filter to make a laser beam pass through is inserted in the connection part.

43. 发明专利

JPS6424046A FLUORIDE OPTICAL FIBER DRAWING FURNACE 失效
公开(公告)号：JPS6424046A
公开(公告)日：1989-01-26
申请号：JP18048287
申请日：1987-07-20
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAKAGUCHI SHIGEKI , OISHI YASUTAKE , FUJIURA KAZUO
IPC分类号： C03B37/027 , C03B37/029
摘要： PURPOSE:To draw a fluoride optical fiber having excellent mechanical strength by heating a rod-shaped fluoride glass base material by the title drawing furnace provided with a furnace core tube made of high-purity aluminum and coaxially arranged with the heater. CONSTITUTION:The rod-shaped fluoride glass base material 1 is introduced through an O ring 3a into the drawing furnace obtained by providing a furnace core tube 6 between upper and lower casings 3 and 4, and partially heated by a heater 5. A gas contg. a fluoride compd. such as HF is simultaneously sent into the furnace from a gas inlet 7 toward an outlet 8. Under such conditions, the base material 1 is drawn into a fiber 2. In the drawing furnace, the furnace core tube 6 coaxially arranged with the heater 5 is made of aluminum having >=99.9% purity. Consequently, the crystallization of the base material 1 is controlled, the corrosion of the furnace core tube 6 is prevented, and a fluoride optical fiber having a low loss and high strength can be drawn.

44. 发明专利

JPS63151641A SURFACE-TREATMENT OF FLUORIDE OPTICAL FIBER PREFORM 失效
公开(公告)号：JPS63151641A
公开(公告)日：1988-06-24
申请号：JP29627386
申请日：1986-12-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SAKAGUCHI SHIGEKI , OISHI YASUTAKE , KANAMORI TERUHISA
IPC分类号： G02B6/00 , C03B8/00 , C03B37/014 , C03C25/68
摘要： PURPOSE:To remove hydroxyl group and oxide existing near the surface of a fluoride optical fiber perform, to prevent the formation of oxide in drawing and to obtain an optical fiber having high strength, by heating a fluoride optical fiber perform at a temperature near the glass transition temperature in a stream consisting of dried fluorine gas and dried inert gas. CONSTITUTION:A fluoride optical fiber preform is heated at a temperature near the glass transition temperature in a gas stream consisting of dried fluorine-containing gas (e.g. HF gas) and dried inert gas (e.g. Ar gas). Hydroxyl group and oxide existing near the surface of the glass preform can be removed prior to the drawing. Accordingly, the formation of oxide in drawing under heating can be prevented and the crystallization on the surface can be suppressed to obtain a fluoride optical fiber having high mechanical strength. Since the fiber need not be covered with an FEP pipe, a fluoride optical fiber having good transmission characteristics can be produced.

45. 发明专利

JPS63144231A INCIDENCE DEVICE FOR FOURIER TRANSFORMATION TYPE OPTICAL FIBER LOSS MEASURING INSTRUMENT 失效
公开(公告)号：JPS63144231A
公开(公告)日：1988-06-16
申请号：JP29177886
申请日：1986-12-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OISHI YASUTAKE , SAKAGUCHI SHIGEKI
IPC分类号： G02B6/42 , G01M11/00 , G01M11/02
摘要： PURPOSE:To measure the loss spectrum of an optical fiber with high accuracy by providing an aperture behind a concave mirror which converges luminous flux projected by a Michelson interferometer and reducing the diameter of converged light incident on the optical fiber. CONSTITUTION:The Michelson interferometer consists of a light source 1, the concave mirror 2, fixed mirrors 3 and 3', a movable mirror 4, and a beam splitter 5. Composite wave luminous flux from the interferometer is converged by an elliptic mirror 6, and made incident on a convex lens 8 after being transmitted through the aperture 7 to obtain parallel luminous flux. Then part of the luminous flux is branched by an optical demultiplexer and this luminous flux is guided to a photodetector 14' through an optical attenuator 10 and the convex lens 8. The remaining luminous flux demultiplexed by the optical demultiplexer 9, on the other hand, is converged by the convex lens 9 and incident on an optical fiber 13 arranged by an optical fiber holder 12 so that its incidence end surface is on the focus, and its projection light is detected by a photodetector 14. The outputs of photodetectors 14 and 14' are guided to a computer through a preamplifier and an A/D converter and processed by Fourier transformation to obtain a projection light spectram.

46. 发明专利

JPS62212223A PRODUCTION OF ALUMINUM FLUORIDE AND DEVICE THEREFOR 失效
公开(公告)号：JPS62212223A
公开(公告)日：1987-09-18
申请号：JP5205686
申请日：1986-03-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUJIURA KAZUO , OISHI YASUTAKE , SAKAGUCHI SHIGEKI
IPC分类号： C01F7/50
摘要： PURPOSE:To produce high-purity AlF3 continuously, by reacting a vaporized AlBr3 gas with a fluorine gas in a gaseous phase. CONSTITUTION:A bromine gas supported on a carrier gas is fed to an AlBr3- forming container 1 packed with a Al powder 4 between quartz filters 3 of an enlarged diameter part 2, an AlBr3 gas is formed by heating the container 1 by an electric furnace 5 and the formed AlBr3 gas is introduced through a feed pipe 6 to a reaction zone 9 in a reactor 7. Simultaneously a fluorine gas supported on the carrier gas is sent from a junction part 8 to the reaction zone 9, the reaction zone 9 is kept at 100-900 deg.C by the electric furnace 10, both the gases are reacted in a gaseous phase to form AlF3 and coagulated AlF3 is collected through a cyclone 11 and a dust collector 12. Consequently, AlF3 having contents of Fe, Cu, Ni, Co and Cr of

47. 发明专利

JPS62176916A PREPARATION OF ZIRCONIUM FLUORIDE HAVING HIGH PURITY 失效
公开(公告)号：JPS62176916A
公开(公告)日：1987-08-03
申请号：JP1973186
申请日：1986-01-31
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： FUJIURA KAZUO , OISHI YASUTAKE , SAKAGUCHI SHIGEKI
IPC分类号： C01G25/04
摘要： PURPOSE:To prepare ZrF4 having high purity and desired particle size capable of providing ZrF4 infrared optical fiber having extremely small transmission loss in large amt. by allowing vaporized ZrBr4 to react with F-contg. gas in gaseous phase. CONSTITUTION:ZrBr4 is formed by feeding gaseous mixture consisting of Br2 and Ar to an electric furnace 3 packed with metallic Zr powder 4 between quartz filters 2, 2 provided in the inside of a ZrBr4-forming section 1 and heating the Zr powder at ca. 330 deg.C. Then, the vaporized ZrBr4 at high temp. is introduced into a Pt reaction tube 6 provided in a reaction zone 10 through an introducing pipe 5 which is held at a temp. (e.g. ca. 400 deg.C) sufficient for preventing condensation of ZrBr4, and the gaseous mixture is heated at 100-800 deg.C (e.g. 500 deg.C) in a horizontal electric furnace 7, and allowed to react in the gaseous phase with introduced F-contg. gas such as HF diluted with Ar. Thus, the particle size is controlled within a range from fine powder to granular body easily by the control of the reaction condition, and obtd. product is collected by a cyclone 8 and a collector 9 to prepare the titled ZrF4.

48. 发明专利

JPS6295439A MEASURING INSTRUMENT FOR TRANSMISSION LOSS SPECTRUM 失效
公开(公告)号：JPS6295439A
公开(公告)日：1987-05-01
申请号：JP23598285
申请日：1985-10-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OISHI YASUTAKE , SAKAGUCHI SHIGEKI
IPC分类号： G02B6/00 , G01M11/00 , G01M11/02
摘要： PURPOSE:To constitute an inexpensive measuring instrument excellent in weather resistance which measures a transmission loss spectrum with high accuracy in a short time by using specific fluoride glass for a half-mirror base. CONSTITUTION:A half-mirror 5 is formed by coating the half-mirror base. The half-mirror base uses chalcogenide glass selected among groups of an As-S system, an As-Ge-Se system, and a Ge-S system or fluoride glass containing an element selected among groups Ia-IVa, IIIb, and IVb. This chalcogenide glass or fluoride glass is cheaper than single crystal of KBr or Caf2 used as the half-mirror base of a Michelson's interferometer conventionally, does not have remarkable deliquescence unlike single crystal of KBr or CaF2 and has excellent weather resistance, and a larger base is easily manufactured.

49. 发明专利

JP2002141592A OPTICAL FIBER AMPLIFIER 失效
公开(公告)号：JP2002141592A
公开(公告)日：2002-05-17
申请号：JP2000331744
申请日：2000-10-31
申请人： NIPPON TELEGRAPH & TELEPHONE , NTT ELECTRONICS CORP
发明人： SHIMIZU MAKOTO , SAKAMOTO TADASHI , ONO HIROTAKA , NISHIDA YOSHIKI , OISHI YASUTAKE
IPC分类号： H01S3/131 , H01S3/06 , H01S3/067 , H01S3/094 , H01S3/0941 , H04B10/07 , H04B10/29 , H04B10/293 , H04B10/564 , H04B10/572 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/16 , H04B10/17
摘要： PROBLEM TO BE SOLVED: To provide an ALC operation or AGC operation optical fiber amplifier applicable even to a case where the wavelength of a signal light varies with time in an optical transmission system, or a case where the signal light has a wide line width and an ASE component contained within the line width is not negligible as compared with the signal light component. SOLUTION: The optical fiber amplifier employing a rare earth added optical fiber 1 as an amplification medium comprises a pumping light source 7, a pumping light source drive circuit 6, a liquid mixing coupler 12 for pumping light and signal light, a tap 11 for branching a part of amplified light exiting the optical fiber, and a monitor photodetector 2 for subjecting the branched outgoing light to OE conversion. The optical fiber amplifier further comprises an electric filter 3 for passing only a specified frequency component of an electric signal from the monitor photodetector 2, an operating circuit 4 for calculating the difference between an electric signal passed through the electric filter 3 and an electric signal of preset value and outputting the calculation results, and a light source drive circuit 6 for regulating the quantity of pumping light based on the output from the operating circuit 4 thus ensuring a constant quantity of the output light.

50. 发明专利

JP2002040269A OPTICAL FIBER MODULE FOR LIGHT AMPLIFICATION AND OPTICAL FIBER AMPLIFIER 失效
公开(公告)号：JP2002040269A
公开(公告)日：2002-02-06
申请号：JP2000227796
申请日：2000-07-27
申请人： NIPPON TELEGRAPH & TELEPHONE , NTT ELECTRONICS CORP
发明人： KANAMORI TERUHISA , OIKAWA KIRYO , SAKAMOTO TADASHI , SHIMIZU MAKOTO , OISHI YASUTAKE
IPC分类号： G02B6/255 , G02B6/00 , G02B6/02 , G02B6/10 , H01S3/06 , H01S3/10
摘要： PROBLEM TO BE SOLVED: To provide an optical fiber module for light amplification and an optical fiber amplifier which cause no deterioration of amplification characteristic even when the amplifier is high-power excited and have high reliability. SOLUTION: In the optical fiber module for light amplification which is provided with an optical fiber for amplification composed of a core made of glass composition added by rare earth ions as luminous ions and a clad covering the core and a quartz optical fiber connected with both ends of the optical fiber for amplification, Cr ions are further added to the core.

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