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81. 发明专利

JPH0936470A PULSE LASER DEVICE AND OTDR DEVICE 失效
公开(公告)号：JPH0936470A
公开(公告)日：1997-02-07
申请号：JP18286795
申请日：1995-07-19
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MOBARA MASAICHI
IPC分类号： G01M11/00 , H01S5/068 , H01S3/133
摘要： PROBLEM TO BE SOLVED: To obtain a pulse laser emitting a pulse laser light in narrow wave length band stably. SOLUTION: A stabilized current Is generated from a stabilized power generation circuit 24 and a pulse current Ip generated from a pulse power generation circuit 26 are added in a current adder circuit 28 and a sum current (drive current) I is fed to a Fabry-Perot laser thus guiding a light to a waveguide type diffraction grating 12. A part of light having reflection wavelength λ being set in the waveguide type diffraction grating 12 is reflected to the Fabry-Perot laser and contributes to inductive emission of laser light. The stabilized current Is has current level lower than the pulse current Ip and it is fed earlier than the pulse current I. Consequently, the Fabry-Perot laser enters into stabilized oscillating state and emits a pulse laser light in narrow wavelength band immediately after supply of the pulse current Ip.

82. 发明专利

JPH08338918A FORMATION OF OPTICAL WAVEGUIDE TYPE DIFFRACTION GRATING AND FORMING DEVICE THEREFOR 失效
公开(公告)号：JPH08338918A
公开(公告)日：1996-12-24
申请号：JP8785096
申请日：1996-04-10
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： INOUE SUSUMU , MOBARA MASAICHI , HATTORI YASUJI , ITO MASUMI , IWASHIMA TORU
IPC分类号： G02B6/00 , G02B5/18 , G02B6/02 , G02B6/12 , G02B6/13
摘要： PURPOSE: To provide a process for forming optical waveguide type diffraction gratings capable of forming chirped gratings having good accuracy with simple constitution. CONSTITUTION: An optical fiber 1 has a core added with Ge and is irradiated with the interference fringes of light of a wavelength about 240nm in the core part, by which the Bragg diffraction gratings are formed. An irradiation part 2 is used to irradiate the optical waveguide part of the optical waveguide with the light of the wavelength to induce a refractive index change therein and has a gentle light intensity distribution to the optical fiber 1. The light signal from a light source 4 is introduced via an optical fiber coupler 3 into the optical fiber 1 in the irradiating stage and the reflected signal from a diffraction grating forming part 1a is measured via the optical fiber coupler 3 in a measuring part 5. The irradiation by the irradiation part 2 is stopped where the desired result of the measurement is obtd.

83. 发明专利

JPH08286065A PRODUCTION OF PLANE OPTICAL WAVEGUIDE 失效
公开(公告)号：JPH08286065A
公开(公告)日：1996-11-01
申请号：JP9089195
申请日：1995-04-17
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： IWASHIMA TORU , INOUE SUSUMU , MOBARA MASAICHI
IPC分类号： G02B6/13 , G02B5/18
摘要： PURPOSE: To provide a novel method capable of easily producing a plane optical waveguide having diffraction gratings. CONSTITUTION: This process for production has a first stage for forming a first layer 12 added with germanium oxide by using quartz glass as a chief material on a substrate 10, a second stage for forming a core part 16 as an optical waveguide region by irradiating the prescribed region of this first layer 12 with UV light, a third stage for forming the interference fringes of the UV light by irradiating the prescribed region of the core part 16 with the UV light to form refraction gratings 26 in the core part 16 and a fourth stage for forming a second layer by using the quartz glass as a chief material on the first layer 12. The formation of the core part 16 is executed by the irradiation with the UV light in the same manner as for the formation of the diffraction gratings 26 and, therefore, the flow over the entire part of the work is simplified.

84. 发明专利

JPH08286061A OPTICAL FILTER 失效
公开(公告)号：JPH08286061A
公开(公告)日：1996-11-01
申请号：JP8948695
申请日：1995-04-14
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MOBARA MASAICHI , INOUE SUSUMU , IWASHIMA TORU
IPC分类号： G02B6/00 , G02B6/02 , G02B6/10 , G02B6/12 , G02B6/16
摘要： PURPOSE: To realize an optical filter with a large loss ratio. CONSTITUTION: A loss part 2 and a reflection part 3 are arranged in an optical fiber 1. The loss part 2 is constituted by forming an optical waveguide type diffraction grating inclined to the optical axis of the optical fiber 1, and the reflection part 3 is constituted by forming the optical waveguide type diffraction grating orthogonal to the optical axis of the optical fiber 1. The loss part 2 is arranged on this side in the advancing direction of the transmitted light being incident light 4 with respect to the reflection part 3. The loss ratio of the loss part 2 is set to -20dB and the reflection loss of the reflection part 3 is set to 0.04dB. The incident light 4 of wavelength λ being 0dBm is attenuated by -20dB in the loss part 2 and the reflection part 3, and the transmitted light 5 becomes -40dBm. The reflected light 6 moves back and forth in the loss part 2, so that it is attenuated by -40dB and becomes -40.04dBm after adding the reflection loss -0.04dB of the reflection part 3 to the light 6.

85. 发明专利

JPH08286051A MANUFACTURE OF OPTICAL WAVEGUIDE TYPE DIFFRACTION GRATING 失效
公开(公告)号：JPH08286051A
公开(公告)日：1996-11-01
申请号：JP8832295
申请日：1995-04-13
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： ITO MASUMI , INAI MAKI , ENOMOTO TADASHI , INOUE SUSUMU , MOBARA MASAICHI
IPC分类号： G02B5/18 , G02B6/02 , G02B6/10 , G02B6/16
摘要： PURPOSE: To provide the manufacture of a fiber type diffraction grating which has enhanced reflectivity with respect to a light component having a specified wavelength and also, to provide the fiber for manufacturing the diffraction grating. CONSTITUTION: In this manufacture, a conventional quartz optical waveguide 10 contg. germanium oxide (GeO2 ) in its core part is placed in a reaction chamber and then, gaseous hydrogen (H2 ) is allowed to flow into the reaction chamber and concurrently, the conditions of the inside of the reaction chamber are set at high temp. and high pressure levels. While cooling the optical fiber thus subjected to reduction treatment with hydrogen by using a cooler 110, interfering beams of ultraviolet light are generated with an interference mechanism 40 and the waveguide 10 is irradiated with the interfering beams to increase oxygen deficiency type defects in the waveguide 10 and also, to inhibit OH groups from being generated in it and accordingly, a marked change in refractive index is effected in the waveguide 10 to manufacture the objective diffraction grating.

86. 发明专利

JPH08286015A FORMING DEVICE FOR OPTICAL WAVEGUIDE TYPE DIFFRACTION GRATING 失效
公开(公告)号：JPH08286015A
公开(公告)日：1996-11-01
申请号：JP9045995
申请日：1995-04-17
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： INOUE SUSUMU , MOBARA MASAICHI , IWASHIMA TORU , ITO MASUMI
IPC分类号： G02B6/00 , G02B5/18 , G02B6/12 , G02B6/13
摘要： PURPOSE: To provide an optical waveguide type diffraction grating forming device capable of forming a grating of a desired grating interval with a simple constitution. CONSTITUTION: An optical fiber 1 is the optical fiber having a Ge added core and the refractive index of a part irradiated with a laser beam whose wavelength is near a wavelength 240nm can be raised. The laser beam generated from a pulsive laser light source 4 is made to be a slit-shape through an optical system 5 to be projected on the core of the optical fiber 1. However the optical fiber 1 is moved by an automatic stage 2, output pulses corresponding to the moving amount are applied to a frequency divider part 6 by a linear encoder 3. The laser beam is projected on the fiber 1 by allowing the frequency divider part 6 to output an output signal according to the value set in a frequency dividing ratio setting part 8 and by making a laser driving part 7 operate intermittently. Thus, the part having a large refractive index can be partially formed, and a Bragg diffraction grating can be formed.

87. 发明专利

JPH08271375A OPTICAL LINE INSPECTING METHOD AND OPTICAL LINE INSPECTING SYSTEM 失效
公开(公告)号：JPH08271375A
公开(公告)日：1996-10-18
申请号：JP6955495
申请日：1995-03-28
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MOBARA MASAICHI , INOUE SUSUMU
IPC分类号： G01M11/00 , G01M11/02
摘要： PURPOSE: To provide an optical line inspecting method using an optical filter constituted of few optical wave guide type diffraction gratings. CONSTITUTION: A luminescence section 10 outputs the inspection light having the wavelength width of about 20nm or below. Since this inspection light is used to inspect an optical line 3, the reflected wavelength width of an optical filter 60 provided at the terminal end section of the optical line 3 can be made sufficiently narrow. The number of the optical wave guide type diffraction gratings constituting the optical filter 60 can be reduced, the transmission loss of the signal light due to a mode mismatch or the absorption of the OH group is reduced, and the optical line can be inspected while the effect on the optical communication is sufficiently suppressed.

88. 发明专利

JPH08136748A WAVELENGTH DISPERSION COMPENSATOR 失效
公开(公告)号：JPH08136748A
公开(公告)日：1996-05-31
申请号：JP27508894
申请日：1994-11-09
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： MOBARA MASAICHI , INOUE SUSUMU , ITO MASUMI , INAI MAKI
IPC分类号： G02B6/00 , G02B6/02 , G02B6/10
摘要： PURPOSE: To realize a wavelength dispersion compensator capable of sufficiently compensating the wavelength dispersion of optical fibers even if this compensator is not provided with long gratings. CONSTITUTION: This wavelength dispersion compensator 100 is formed by connecting dispersion compensating parts 101, 102... consisting of optical parts 20 and the optical fibers 30 which are connected with these optical parts 20 and in which gratings 31 monotonously changing in wavelengths along the optical axes are formed at their cores to multiple stages in series. The wavelength dispersion of the signal light inputted to the wavelength dispersion compensator 100 is lessened by the gratings 31 having the respective dispersion compensating parts and the lessening of the wavelength dispersion is repeated by as much as the number of the dispersion compensating parts. The signal light sufficiently compensated of the wavelength dispersion is eventually outputted.

89. 发明专利

JPH08136742A METHOD FOR IDENTIFYING OPTICAL LINE AND LIGHT INTERFERENCE METER 失效
公开(公告)号：JPH08136742A
公开(公告)日：1996-05-31
申请号：JP27778894
申请日：1994-11-11
申请人： SUMITOMO ELECTRIC INDUSTRIES , NIPPON TELEGRAPH & TELEPHONE
发明人： MOBARA MASAICHI , INOUE SUSUMU , SHITOMI TATSUHIKO , HATTORI YASUJI , YAMASHITA KATSUYA , OTSUKI FUMIO
IPC分类号： G01B9/02 , G01M11/00 , G02B6/00 , H04B10/07 , H04B10/071 , H04B10/077
摘要： PURPOSE: To easily and exactly identify respective optical lines at their ends. CONSTITUTION: The optical lines 50 are provided thereon with identifying marks 39 consisting of signal groups composed of plural reflection parts and reference reflection parts. The relative positions thereof are changed for every optical line 50 to provide the identification marks for the respective optical lines. Inspection light is made incident on the optical lines 50 and the reflected light returning from the respective reflection parts is detected by a Michelson interferometer 30. The identification marks 39 are detected in accordance with the optical path differences of the respective reflected light rays to identify the respective optical lines.

90. 发明专利

JPH07301509A METHOD FOR MEASURING INTERVAL BETWEEN INTERFERENCE FRINGES 失效
公开(公告)号：JPH07301509A
公开(公告)日：1995-11-14
申请号：JP9351194
申请日：1994-05-02
申请人： SUMITOMO ELECTRIC INDUSTRIES
发明人： INOUE SUSUMU , MOBARA MASAICHI , ITO MASUMI , INAI MAKI
IPC分类号： G01B9/02 , G01B11/00 , G02B5/18
摘要： PURPOSE:To measure the interval between interference fringes in a simple procedure without using any image pickup device by detecting the light intensity of the fringes by relatively moving the light receiving area of a photodetecting means against the fringes and calculating the interval between fringes based on the output fluctuation of the photodetecting means and the moved amount of the light receiving area. CONSTITUTION:Interference fringes to be measured formed at regular intervals are projected upon a mask plate 2. When the plate 2 is moved along the arranging direction of the fringes by adjusting the voltage applied across a piezoelectric element 4, an opening 3 crosses the fringes. Therefore, the intensity of the light which is made incident on the opening 3 and detected by means of a light receiving element 1 periodically changes in corresponding to the bright and dark parts of the fringes. The light intensity of the fringes is detected by relatively moving the light receiving area of the element against the fringes in the arranging direction of the fringes. When the moved amount of the light receiving area corresponding to one cycle of the variation of the light intensity from the periodical output fluctuation of the element 1, the interval between the fringes can be measured. Therefore, the interval between the fringes can be measured in a simple procedure without using any image pickup device.

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