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51. 发明专利

JPH112734A OPTICAL WAVEGUIDE CIRCUIT WITH OPTICAL CHARACTERISTIC ADJUSTING PLATE AND ITS MANUFACTURE AND MANUFACTURING DEVICE FOR OPTICAL CHARACTERISTIC ADJUSTING PLATE 失效
公开(公告)号：JPH112734A
公开(公告)日：1999-01-06
申请号：JP18265197
申请日：1997-07-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA HIROAKI , INOUE YASUYUKI , TAKADA KAZUMASA , MITACHI NARIYUKI , ABE ATSUSHI
IPC分类号： G02B6/122 , G02B6/12 , G02B6/13 , G02F1/313
摘要： PROBLEM TO BE SOLVED: To provide an optical waveguide circuit with a phase adjusting plate adjusting an optical path length error occurring at the time of manufacturing a planar optical circuit with additional processing performed after manufacturing by providing a groove traversing all of plural optical waveguides and installing the plate adjusting the optical characteristic of the optical waveguide on its groove. SOLUTION: This optical waveguide circuit is constituted of a groove 16 traversing plural waveguides 14-1, 14-2, a plate (optical characteristic adjusting plate) 17 spatially changing the optical characteristic in advance so as to correct the optical characteristic of a part intersecting with the optical waveguide 14 when the groove 16 is inserted and an adhesive fixing the optical characteristic adjusting plate 17 to the groove 16. In this optical waveguide circuit, the optical characteristics of the light propagating through the waveguide 14-1, 14-2 are changed in accordance with the optical characteristic of the optical characteristic adjusting plate 17 of the intersecting parts with the waveguides 14-1, 14-2. Thus, the optical characteristics of the waveguides 14-1, 14-2 are measured and thereafter, the optical characteristic adjusting plate 17 is fixed to the groove 16 by using the adhesive to adjust the optical characteristics of the waveguides 14-1, 14-2 to required values.

52. 发明专利

JPH0961298A LOW COHERENCE REFLECTOMETER 失效
公开(公告)号：JPH0961298A
公开(公告)日：1997-03-07
申请号：JP21563595
申请日：1995-08-24
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , YAMADA HIROAKI
IPC分类号： G01M11/02
摘要： PROBLEM TO BE SOLVED: To provide a low coherence reflectometer with large variation in light path length and having an optically variable delay circuit using commercially available retroreflectors in a simple structure. SOLUTION: Retroreflectors 22, 24 are made to face each other, a light beam is incident between the retroreflectors 22, 24 to have it reflected with one of the retroreflectors, and the beam is reflected between the retroreflectors 22, 24 sequentially to return to the origination via a reflecting mirror 25. In addition, the movable retroreflector 24 is moved to come closer to/farther from a fixed retroreflector 25 and moved in a direction shifted with respect to the fixed retroreflector 25.

53. 发明专利

JPH07294756A METHOD FOR ADJUSTING CHARACTERISTIC OF OPTICAL CIRCUIT AND DEVICE THEREFOR 失效
公开(公告)号：JPH07294756A
公开(公告)日：1995-11-10
申请号：JP9126194
申请日：1994-04-28
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA HIROAKI , TAKADA KAZUMASA , INOUE YASUYUKI , HORIGUCHI MASAHARU
IPC分类号： G02B6/12 , G02B6/122
摘要： PURPOSE:To provide a method for adjusting the characteristics of an optical circuit capable of adjusting the characteristics of even the optical circuit having >=3 pieces of paths with high accuracy within a short period of time and a device for such adjustment. CONSTITUTION:The optical circuit is installed in the one optical path of an interferometer formed by using a light source having a coherence length (coherence distance shorter than the optical path difference between arbitrary two paths in the optical circuit to be subjected to the characteristic adjustment. The optical path length (x) of the other optical path which is a reference optical path is changed and an interferogram V(x) of the light waves propagating the respective paths and reference light is measured (S1). N-pieces of isolated signals Vk(x) (k=1, 2,..., N) are extracted from this interferogram V(x) (S2), and Fourier transform of the extracted beat signals Vk(x) is calculated (S3). The phase change rates that the light propagating the respective paths receive are led out of the phase of the Fourier transform (S4). The refractive indices of the optical waveguides constituting the respective paths are so controlled that the specified differences between the phase change rates in the respective paths and their design values are obtd.

54. 发明专利

JPH07243940A POLARIZATION-DEPENDENT LOSS MEASURING METHOD AND DEVICE 失效
公开(公告)号：JPH07243940A
公开(公告)日：1995-09-19
申请号：JP3497094
申请日：1994-03-04
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , YAMADA HIROAKI , HORIGUCHI MASAHARU
IPC分类号： G01J4/00 , G01M11/02
摘要： PURPOSE:To measure the difference of transmittance with high accuracy by feeding the light from a nonpolarizing light source to a optical wave guide to be tested, measuring the degree of polarization of the transmitted light through the optical wave guide, and determining the polarization-dependent loss based on the obtained result. CONSTITUTION:The polarized constituent of the outgoing light from an optical fiber 4 is elliptically polarized, and the rotation angles of a 1/2-wavelength plate 16 and a 1/4-wavelength plate 17 are adjusted so that the polarized constituent fed into a polarization modulator 18 is linearly polarized in the 45 deg. direction against the X-axis of the modulator 18. When the linearly polarized light is fed in the 45 deg. direction against the X-axis which is the main axis of the modulator 18, the outgoing light from the modulator 18 is not linearly polarized, thus the outgoing light from the modulator 18 is linearly polarized by a 1/4-wavelength plate 19. When voltage is applied to the modulator 18 to change the polarization direction by 90 deg., the light power transmitting a polarizer 20 is made maximum. The nonpolarizing constituent is not changed after passing through the modulator 18. The output signal from a photo-detector 21 is detected by a lock-in amplifier 22, and the voltage of the polarized constituent is obtained.

55. 发明专利

JPH0798264A LOW-COHERENT REFLECTOMETER 失效
公开(公告)号：JPH0798264A
公开(公告)日：1995-04-11
申请号：JP24318693
申请日：1993-09-29
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , HORIGUCHI MASAHARU
IPC分类号： G01M11/00 , G01M11/02
摘要： PURPOSE:To make it possible to perform balanced detection with a simple constitution in a low-coherence reflectometer for measuring the distribution of the reflection in an optical waveguide at high spatial resolution by utilizing the low-coherent optical interfrence. CONSTITUTION:In a photocoupler 20, at least three input/output ports 21-23 and at least two input/output ports 24 and 26 are so provided as to face each other. This photocoupler 20 is used. A light source 1 is optically connected to the input/output port 21. An optical waveguide 7 is provided at the input/ output port 24. A reflecting mirror 6 is provided at the input/output port 26 through a collimater lens 5. The difference in optical intensities at the input/ output ports 9 and 13 is provided.

56. 发明专利

JPH0726818B2 失效
公开(公告)号：JPH0726818B2
公开(公告)日：1995-03-29
申请号：JP6006186
申请日：1986-03-17
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： TAKADA KAZUMASA , TSURUMI SHIGEYUKI , NODA JUICHI , NAKAJIMA BAN , MINEGISHI KAZUSHIGE
IPC分类号： G01B11/22

57. 发明专利

JPH0532724B2 失效
公开(公告)号：JPH0532724B2
公开(公告)日：1993-05-17
申请号：JP16896384
申请日：1984-08-13
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： OKAMOTO KATSUNARI , YOKOHAMA ITARU , NODA JUICHI , TAKADA KAZUMASA
IPC分类号： G02B6/024 , G02B6/28 , G02B6/287 , G02B6/293

58. 发明专利

JPH03209143A METHOD AND DEVICE FOR DIAGNOSING OPTICAL WAVE GUIDE CIRCUIT 失效
公开(公告)号：JPH03209143A
公开(公告)日：1991-09-12
申请号：JP242990
申请日：1990-01-11
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI MASARU , NODA JUICHI , TAKADA KAZUMASA
IPC分类号： G01B11/02 , G01M11/00 , G01M11/02 , G02B6/12 , G02B6/122
摘要： PURPOSE:To enable a measurement of branching ratio with high accuracy by making interference for a branch light propagated through optical wave guide circuit and a phase modulated referring light. CONSTITUTION:An incoherent light from a light source 1 is made incident to a pigtail FP 11 of optical fiber coupler 7 through a lens 2 and bifurcated in a light coupling part FC 1. One of them is made incident to the optical wave guide circuit 17 from a port P1 through a pigtail FP 13, and another one is propagated in a pigtail 14 as the referring light and phase-modulated at the optical fiber part wound to a cylindrical electrostrictive oscillator 9. Then, the output light from circuit 17 is made incident to a pigtail FP 21 of optical coupler 8 and coupled with the phase-modulated referring light in a light coupling part FC 2. When a light propagated in a pigtail FP 24 among the coupled lights is collimated by a lens 3 to enter to a Michelson interference device furnished with a delay circuit and the interference is made for the output light and referring light, the branching ratio of a light branching part can be obtained by means of measuring the intensity ratio of beat components of phase modulation frequency in the intensity of interference light.

59. 发明专利

JPH03209106A ROTARY MIRROR TYPE INTERFEROMETER, INTERFERENCE MEASURING METHOD, AND OPTICAL WAVEGUIDE CIRCUIT DIAGNOSTIC DEVICE 失效
公开(公告)号：JPH03209106A
公开(公告)日：1991-09-12
申请号：JP243090
申请日：1990-01-11
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KOBAYASHI MASARU , NODA JUICHI , TAKADA KAZUMASA
IPC分类号： G01B9/02 , G01M11/00
摘要： PURPOSE:To measure the distance to an measurement object in the direction perpendicular to the optical axis by providing the extent of frequency shift due to the Doppler effect to the reflected light on a reflection mirror, and measuring the intensity of light with respect to each frequency. CONSTITUTION:The incoherent light from a light source 1 is converted to a luminous flux of parallel rays and traverses the (y) axis in a linear part and is branched into two in the linear part on the reflection face of a half mirror 7. One branched luminous flux is thrown to a measurement object 21, and the vertical reflection light is made incident on the mirror 7 again as signal light. The other branched luminous flux is reflected when a total reflection mirror 8 is perpendicular to the optical axis, and the reflection light is made incident on the mirror 7 as reference light and is coupled with signal light. This coupled light traverses the (x) axis in the linear part and is condensed on a photodetector 17 by a lens 5. The light traversing the (y) axis at a point out of this light is branched into two at a point in the mirror 7, and one branched light is reflected at a point of the measurement object 21. The other branched light is reflected at a point of the mirror 8. Both reflected light interfer with each other in the position where they have the same optical path length when the mirror 8 is swept by a stage 14.

60. 发明专利

JPH02257110A STRUCTURE FOR CONNECTING OPTICAL FIBER AND OPTICAL WAVEGUIDE 失效
公开(公告)号：JPH02257110A
公开(公告)日：1990-10-17
申请号：JP7673589
申请日：1989-03-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NODA JUICHI , KOBAYASHI MASARU , TAKADA KAZUMASA , KOBAYASHI SOICHI
IPC分类号： G02B6/30
摘要： PURPOSE:To improve the latitude for connection of the optical waveguide and an optical fiber by forming one end part of the single mode optical waveguide to a horn shape which expands gradually in section toward one end face and connecting the end face of the single mode optical fiber to the one end face of the single mode optical waveguide. CONSTITUTION:The optical waveguide element 110 of single mode is formed of a quartz glass material and has the structure in which the optical waveguide 112 is formed on a substrate 111. The left end part of the optical waveguide 112 is formed as the tapered optical waveguide 112a. This tapered optical waveguide 112a has the horn shape which expands gradually in the width toward the left end face. On the other hand, the optical fiber 120 of the single mode has a clad 121 and a core 122 and the right end of this optical fiber 120 is connected to the left end face of the tapered optical waveguide 112a. Since there is the tapered optical waveguide 112a having the wide connecting end face, the allowance for connection in parallel with the plane of the substrate 111 is greatly improved.

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